Current Issues in Sport Science (CISS)最新文献

{"title":"Self-assessment of strength abilities in climbing: Impact of skill level","authors":"Carla Zihlmann, P. Ritsche, Martin Keller, Daniel Zobrist, Lisa Reissner, Peter Wolf","doi":"10.36950/2024.2ciss085","DOIUrl":"https://doi.org/10.36950/2024.2ciss085","url":null,"abstract":"Introduction \u0000Many climbers believe that they are stronger in crimp finger position than in open hand position. However, compared to open hand, crimped fingers are associated with higher pulley forces increasing the risk of injuries. Climbing expertise may influence the estimation of strength, i.e., the better the climber, the better the self-assessment. This study therefore aimed to find out whether climbing expertise influences self-assessment of finger flexor strength in half-crimp and in open hand position. \u0000Methods \u0000Data was collected at the Hands-On Science Booth of the Climbing World Championships in Bern. Participants had to fill out a questionnaire including a self-assessment of their climbing expertise and of their maximum finger strength for both hands as well as both finger positions. Afterwards, maximum finger strength was measured on an instrumented campus board: Participants placed the to-be-measured hand on a self-selected rung (depth of 23 mm) and then tried to transfer as much force as possible from their feet to their fingers. \u0000Results \u0000The analysis was based on 38 intermediate and 36 advanced climbers. Due to the limited number of participants in the lower grade (n = 0) and elite (n = 2) level, those skill levels were not considered. Advanced climbers generated significantly greater forces than intermediate climbers across all four measured conditions (t-tests, all p < 0.01). For both groups, neither in the dominant nor in the non-dominant hand a significant difference in maximum force was observed, e.g., dominant hand, intermediates:  or advanced climbers: . Intermediate climbers did neither over- nor underestimate their strength in half-crimp position compared to open hand (paired t-test, p = 0.91 for dominant, p = 0.077 for non-dominant hand). In contrast to the dominant hand, advanced climbers significantly overestimated their strength in half-crimp position for the non-dominant hand (on average 9%, Cohen’s d 0.64, p < 0.01). \u0000Discussion/Conclusion \u0000Our results confirm the positive correlation between finger strength and climbing level. We also confirm that on a 23 mm rung, greater forces can be generated with in open hand compared to half-crimp (Winkler et al., 2023). With larger hold depths, force generated in open hand significantly increases (Amca et al., 2012), while for smaller holds, force exerted in half-crimp position exceeds that of open hand (Winkler et al., 2023). Hence, at least for larger holds, we recommend adopting an open hand position as preventive measure against finger injuries. Advanced climbers may tend to inaccurately self-assess their strength due to their greater engagement with peers, potentially leading to the circulation of misinformation. Note that participants were instructed to provide a general self-assessment of their strength rather than for a 23 mm deep rung, i.e., they may have had a smaller hold in mind. \u0000References \u0000Amca, A. M., Vigouroux, L., Aritan, S., & Berton, E. (2012). Effect of","PeriodicalId":415194,"journal":{"name":"Current Issues in Sport Science (CISS)","volume":"330 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139858304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Challenges and practices in international sport federations to gain and maintain legitimacy","authors":"Josephine Clausen, E. Bayle","doi":"10.36950/2024.2ciss012","DOIUrl":"https://doi.org/10.36950/2024.2ciss012","url":null,"abstract":"Introduction\u0000International sport federations (IFs) are today part of complex ecosystems (Bayle, 2023). As governing bodies, they are regulators and define and sanction sporting and participation rules. IFs are further organizers of international sport events, some of which attract large audiences and investments. In this role, IFs have to satisfy diverging demands of multiple stakeholders (Chappelet, 2021). Additionally, IFs have become important social, economic and political actors. They are employers and as such contribute to the local economy and have a corporate social responsibility. And with sport being increasingly interwoven with money, power, politics and state interests, IFs also influence and are influenced by geopolitics. This has entailed corruption and self-enrichment on one side of the spectrum, and it enabled peace processes and development on the other side. In this complex web of mission, expectations and pressures, how do IFs gain/maintain legitimation?\u0000Methods\u0000Using literature research and desk research, we first focus on the role and mission of IFs since their creation and illustrate an overview of the changing expectations against which IFs sought/seek legitimacy (historical timeline). Reflecting the conceptual model of Bayle and Clausen (2023, under review) on IFs’ organizational performance and its operationalization, we then map explicit and implicit performance indicators that derive from IFs’ mission and the multiple social, economic and political activities they have embraced over the past decades. Based on this mapping, we discuss IFs’ strategies to meet expectations and pressures that result from these performance indicators. We conclude the presentation with an assessment of the interrelation between expectations towards IFs, strategies developed by IFs, and internal/external performance control mechanisms based on five interviews.\u0000Results\u0000The social, political, and economic influence of IFs is largely recognized today. Yet, their legitimacy as non-profit governing bodies of sport in the eyes of prominent stakeholders (e.g., IOC, governments, sponsors) is currently reduced to their ability to comply with dominant governance and sustainability frameworks. As a result of this narrow focus, academics and practitioners have developed a good understanding and monitoring mechanisms of IFs’ governance practices. On the other hand, IFs’ performance and legitimacy from a mission and purpose perspective is greatly understudied.\u0000Discussion/Conclusion\u0000One of the challenges in defining performance indicators for IFs is their broad societal mission. Firstly, the impact of IFs’ activities to contribute to some sort of societal betterment is difficult to measure. And secondly, the priorities of societal issues change (e.g., poverty, health, climate). Any performance measurement system for IFs therefore needs to be dynamic to address both IFs’ mission and evolving external expectations.\u0000References\u0000Bayle, E. (2023). A model for the ","PeriodicalId":415194,"journal":{"name":"Current Issues in Sport Science (CISS)","volume":"139 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139858693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inventing safe sport: Comparing Swiss and global strategies","authors":"Benjamin Carr","doi":"10.36950/2024.2ciss035","DOIUrl":"https://doi.org/10.36950/2024.2ciss035","url":null,"abstract":"The revelations from the Magglingen Protocols article (Gertsch & Krogerus, 2020) brought a spotlight of Switzerland’s national attention to the issues concerning safeguarding against maltreatment in sport. The experiences of the athletes featured in the article were certainly not the first, nor the last, of their kind in Switzerland, and much less in the world. While the International Olympic Committee provided guidelines for international federations and national Olympic committees to follow in the development of their own safeguarding programs (Burrows, 2017), the implementation of such programs varies considerably. Few, if any, in the emerging field would claim to have found the “right” way to handle the many facets of safeguarding, which are complexified by sociocultural norms and definitions, sport-specific practices, and local jurisprudence. Questions about who within the sports ecosystem is responsible, and for what, in the safeguarding process lack consensus, and countries have answered them in their own ways. Fundamentally, the philosophical notions of what constitutes “abuse,” “maltreatment,” “care,” and “wellbeing” (among others) underpin any attempt to understand the safeguarding problem and respond to it with policy. The cultural differences in the meanings behind these notions leads consequently to the dissimilar implementation of efforts to address them. This presentation proposes a critical reflection on the strategic efforts globally and within Switzerland to understand and frame the issue of safeguarding to create a unified approach in policy making. While not an exhaustive comparison of every nation’s approach, the reflection will compare the Swiss strategy with certain notable examples, highlighting what pressing moral and philosophical questions the Swiss strategy has yet to answer. \u0000References \u0000Burrows, K. (2017). IOC Safeguarding Toolkit for IFs and NOCs. International Olympic Committee. https://d2g8uwgn11fzhj.cloudfront.net/wp-content/uploads/2017/10/18105952/IOC_Safeguarding_Toolkit_ENG_Screen_Full1.pdf \u0000Gertsch, C., & Krogerus, M. (2020, October 31). Die Magglingen Protokolle. Tages-Anzeiger Das Magazin. https://www.tagesanzeiger.ch/wie-turnerinnen-in-magglingen-gebrochen-werden-170525604713","PeriodicalId":415194,"journal":{"name":"Current Issues in Sport Science (CISS)","volume":"7 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139859244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Slow waves during deep sleep support cardiac function","authors":"S. Huwiler, M. Carro-Domínguez, F. Stich, R. Sala, F. Aziri, A. Trippel, Tabea Ryf, Susanne Markendorf, D. Niederseer, Philipp Bohm, Gloria Stoll, Lily Laubscher, Jeivicaa Thevan, Christina M. Spengler, Joanna Gawinecka, Elena Osto, Reto Huber, Nicole Wenderoth, Christian Schmied, C. Lustenberger","doi":"10.36950/2024.2ciss004","DOIUrl":"https://doi.org/10.36950/2024.2ciss004","url":null,"abstract":"Introduction\u0000The role of sleep in cardiovascular health, particularly the impact of deep non-rapid eye movement (NREM) sleep, is gaining interest in the prevention of cardiovascular diseases (Grandner et al., 2016). Essentially slow waves, prominent brain oscillations during deep sleep, seem to represent an important cardiovascular recovery process for the human body. However, to date, the specific mechanisms through which sleep affects cardiovascular function and whether slow waves accelerate recovery remain elusive.\u0000Methods\u0000Here, we explored the role of slow waves in promoting cardiovascular function. In this randomized, cross-over trial involving 18 healthy male participants (Huwiler et al., 2023), we investigated how experimentally enhancing slow waves via auditory stimulation (Huwiler et al., 2022) impacts cardiovascular dynamics during sleep and next-day cardiac function, assessed via an echocardiography. All participants underwent three experimental nights including two conditions for slow wave enhancement and one SHAM control condition while brain oscillatory, blood pressure, and cardiac dynamics were continuously measured during sleep.\u0000Results\u0000Using a linear mixed-effect model approach, we found auditory stimulation to significantly increase slow wave activity (F(2, 33.095) = 11.397, p < 0.001) during times of stimulation. This slow wave enhancement coincided with a dynamic cardiovascular activation, indicated through short increases in blood pressure and a biphasic heart rate response. After sleep, we found a significant increase in general longitudinal strain (F(2, 34) = 81.17, p < 0.001), an increase in left-ventricular ejection fraction (F(2, 34) = 4.55, p = 0.018), and a decrease in E/e’ ratio (F(2, 34) = 3.38, p = 0.046) for both slow wave stimulation conditions compared to SHAM.\u0000Discussion/Conclusion\u0000We show that slow wave stimulation induces a cardiovascular activation response possibly related to increasing cardiovascular stability during sleep (De Zambotti et al., 2016). Moreover, we demonstrate that slow wave stimulation enhances left-ventricular systolic and diastolic function, both together indicating improved cardiac function. Altogether, this points towards the functional involvement of slow waves in promoting cardiovascular health. Therefore, sleep slow wave stimulation may be considered a potential supplementary method in treating cardiovascular diseases involving decreased left-ventricular function. Furthermore, our findings hint that enhancing slow waves could potentially optimize post-exercise recovery processes and increase cardiovascular well-being.\u0000References\u0000De Zambotti, M., Willoughby, A. R., Franzen, P. L., Clark, D. B., Baker, F. C., & Colrain, I. M. (2016). K-complexes: Interaction between the central and autonomic nervous systems during sleep. Sleep, 39(5), 1129–1137. https://doi.org/10.5665/sleep.5770\u0000Grandner, M. A., Alfonso-Miller, P., Fernandez-Mendoza, J., Shetty, S., Shenoy, S., & Combs, D. (2016). Slee","PeriodicalId":415194,"journal":{"name":"Current Issues in Sport Science (CISS)","volume":"56 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139859765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reliability and validity of portable dynamometers in testing shoulder and shoulder girdle strength: A systematic review","authors":"Urs Minder, Claudio Perret, U. Arnet, Franziska Bossuyt","doi":"10.36950/2024.2ciss062","DOIUrl":"https://doi.org/10.36950/2024.2ciss062","url":null,"abstract":"Introduction \u0000The prevalence of shoulder pain is high in overhead athletes and in wheelchair users with a spinal cord injury (SCI). Especially in the latter, shoulder pain can have detrimental consequences for an individual's mobility, participation, and quality of life. Shoulder problems have been associated with high and/or repetitive loads induced by for example overhead activities, as well as manual wheelchair activities (Leong et al., 2019; Morrow et al., 2011). Modifiable risk factors for shoulder pain are related to the capacity of the shoulder musculature and include the relative strength or lack of force in certain shoulder muscles (Mulroy et al., 2015). Although isokinetic dynamometers are considered the gold standard in assessing muscle strength, they are typically not available in a therapy or training setting. Strength measurements with portable dynamometers offer a more feasible and financially affordable alternative. To assess changes in muscle strength over time, reliable and valid shoulder and shoulder girdle muscle strength tests are required. Therefore, the aim of this study was to identify validated and reliable portable dynamometer protocols to assess changes in shoulder strength in the general population and wheelchair users with SCI over time. \u0000Methods \u0000A literature search was performed with defined terms from the three main concepts “shoulder joint”, “strength testing” and “reproducibility of results”. The electronic search strategy was developed with the help of a librarian and adapted for the following databases: PubMed (Medline), Cochrane Library (Central register of controlled trials), Web of Science (Core Collection), CINAHL. The population of interest was the general population (≥ 18 years) with and without shoulder pain with a special focus on wheelchair users with SCI. Title and abstract screening, full-text screening, quality assessment and data extraction was performed using Covidence.org. For quality assessment selected boxes from the “COSMIN Risk of Bias tool” were used. Data extraction was performed by two independent authors. The main outcome measures extracted where test-retest reliability (intraclass correlation coefficient, standard error of measurement and minimum detectable difference) and concurrent validity (intraclass correlation coefficient). \u0000Results \u0000Trough systematic search 8,020 studies were identified for screening. Initially 2,267 were excluded as duplicates and 5,647 were excluded for not meeting the inclusion criteria. 106 full-texts have been screened. As data extraction is ongoing the results of reliability and validity of portable dynamometer in testing shoulder strength will be presented at the conference. \u0000Discussion/Conclusion \u0000As data extraction is ongoing the discussion and conclusion will be presented at the conference. \u0000References \u0000Leong, H. T., Fu, S. C., He, X., Oh, J. H., Yamamoto, N., & Yung, S. H. P. (2019). Risk factors for rotator cuff tendinopathy: A systematic review and me","PeriodicalId":415194,"journal":{"name":"Current Issues in Sport Science (CISS)","volume":"379 4-6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139860563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Meaning in elite sport – A narrative review of scholarship in sport psychology","authors":"Violetta Oblinger-Peters, Kristoffer Henriksen, Noora J. Ronkainen","doi":"10.36950/2024.2ciss002","DOIUrl":"https://doi.org/10.36950/2024.2ciss002","url":null,"abstract":"Introduction\u0000Athletes’ heart-felt stories about their experiences in elite sport almost naturally evoke the notion of meaning. However, although various scholars and practitioners have suggested the concept of meaning to the sport psychology audience in the past two decades (e.g., Beckmann, 2023; Ravizza, 2002; Ronkainen & Nesti, 2020), its study in this discipline is still in the early stages compared to established psychological scholarship on the topic. To promote meaning as a complementary lens for research and applied work in sport psychology, the presentation aims to introduce the concept informed by psychological inquiry, and to synthesize and critically comment on the extant scholarship. For this, the wider meaning in life literature will be drawn on to give an overview of components, sources, pathways, and qualities of meaning and set it apart from the related concept of purpose.\u0000Methods\u0000A narrative review of 15 studies on meaning (n = 10) and purpose (n = 5) from elite sport contexts was conducted.\u0000Results\u0000The scholarship on meaning and purpose in elite sport revealed itself diverse in terms of employed study designs (quantitative, qualitative), methodologies and theoretical frameworks (e.g., narrative inquiry, phenomenology), conceptualizations of meaning and purpose (e.g., existential meaning, purpose in coaching), interpretations of meaning (intrapsychic or relational), and topics researched in relation to it (e.g., forced migration, injury experiences). To date the literature base on meaning and purpose in elite sport is characterized by fragmentation and largely imprecise use of the concept.\u0000Discussion/Conclusion\u0000To assist future empirical research and increase conceptual clarity of meaning in elite sport, sport psychology should integrate knowledge from its parent discipline psychology. Additionally, to make the somewhat abstract notion of meaning tangible for sport practitioners, more applied questions must be addressed. Through this, meaning could offer a truly holistic approach to well-being and mental health research and practice in sport. Importantly, “working” with meaning requires personal positioning, since conceiving of meaning as performance enhancement tool or as existential concern has major implications for how it is investigated and for how or whether it should be increased.\u0000References\u0000Beckmann, J. (2023). Meaning and meaninglessness in elite sport. In I. Nixdorf, R. Nixdorf, J. Beckmann, S. Martin, & T. Macintyre (Eds.), Routledge Handbook of Mental Health in Elite Sport (pp. 31–44). Routledge. https://doi.org/10.4324/9781003099345-5\u0000Ravizza, K. (2002). A philosophical construct: A framework for performance enhancement. International Journal of Sport Psychology, 33, 4–18. \u0000Ronkainen, N. J. & Nesti, M. S. (2019). Meaning and Spirituality in Sport and Exercise: Psychological Perspectives. Routledge. https://doi.org/10.4324/9781315102412","PeriodicalId":415194,"journal":{"name":"Current Issues in Sport Science (CISS)","volume":"432 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139860725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The order of running shoes and how it influences the perception of effort and comfort","authors":"Kai Biedermann, Gian-Andri Baumann, Mattia Nolé, Christina M. Spengler, F. Beltrami","doi":"10.36950/2024.2ciss028","DOIUrl":"https://doi.org/10.36950/2024.2ciss028","url":null,"abstract":"Introduction\u0000High performance modern shoes reduce energy expenditure and improve performance, however, these gains may also stem from differences in perceived effort. Humans tend to weigh negative information more heavily than positive information, which could influence perception of effort when different shoes are tested sequentially. This study aimed to determine the existence of negativity bias on different measures of perception when alternating running shoes.\u0000Methods\u0000Eleven well-trained male athletes [age: 28 ± 6 years, weight: 68 ± 5 kg, height: 179 ± 5 cm, peak oxygen consumption: 65 ± 4 ml O2･kg-1･min-1] performed three lab visits: a familiarization day with an incremental test followed by two experimental days (track and treadmill, in balanced order). On each day, participants performed four sets of two 5-min runs at 16km･h-1 (5-min breaks in-between) alternating between On Cloudrunner (entry-level, EL) and Cloudboom Echo 3 (high-performance, HP). The order of the shoes was changed every set (i.e, EL-HP or HP-EL). After each run, participants reported their perception of effort (both on a 100-mm Visual Analog Scale [VAS] and on a 1-10 Borg Scale) and shoe comfort (VAS). Heart rate and gas exchange were monitored using a chest sensor and a metabolic cart. Differences in ratings between EL-HP and HP-EL were compared using paired t-tests.\u0000Results\u0000In combined data of track and treadmill, the physiological response and perception of effort were significantly lower while perception of comfort was significantly higher with HP compared to EL. On the treadmill, the absolute value of the change in perceived effort (VAS) was lower for EL-HP compared with HP-EL (0.6 ± 0.5 mm vs. 1.0 ± 0.7 mm, p = 0.013), but not on the track (EL-HP 0.5 ± 0.5 mm vs. HP-EL 0.6 ± 0.3 mm, p = 0.602). Absolute changes of effort (Borg) were neither affected by shoe order on the treadmill (EL-HP 0.7 ± 0.4 pts vs. HP-EL 0.8 ± 0.7 pts, p = 0.699) nor on the track (EL-HP 0.5 ± 0.4 pts vs. HP-EL 0.7 ± 0.6 pts, p = 0.452). Similarly, ratings of shoe comfort were neither affected by shoe order on the treadmill (EL-HP 1.8 ± 1.1 mm vs. HP-EL 1.4 ± 1.0 mm, p = 0.086) nor on the track (EL-HP 1.5 ± 1.1 mm vs. HP-EL 1.6 ± 1.0 mm, p = 0.674).\u0000Discussion/Conclusion\u0000Changes in perceived effort (VAS) assessed during treadmill running were nearly two times larger when switching from EL to HP than vice-versa, supporting the presence of a negativity bias in this specific condition, which could be related to the higher resolution of VAS scales compared with Borg. Possibly, the lack of negativity bias on the track resulted from an overall reduced rating of effort compared with treadmill, which left less room for differences. These findings suggest that it would be beneficial to include a control shoe worn before and between the tested shoes of interest to mitigate any potential negativity bias in tests when determining perceived effort on a treadmill with different shoes.","PeriodicalId":415194,"journal":{"name":"Current Issues in Sport Science (CISS)","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139861063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing wearable motion tracking by assessing sagittal joint angle accuracy with minimal sensor use","authors":"Brett C. Hannigan, M. Elgendi, Gholami Mohsen, C. Menon","doi":"10.36950/2024.2ciss047","DOIUrl":"https://doi.org/10.36950/2024.2ciss047","url":null,"abstract":"Introduction \u0000Wearable motion tracking technology often focuses on reducing the number of sensors to simplify design and lower costs. Research has shown that single IMUs can reconstruct leg kinematics (Gholami et al., 2020; Hossain et al., 2022; Lim et al., 2020) and ground reaction forces (Jiang et al., 2020) effectively. Additionally, model-based methods have demonstrated the feasibility of using fewer gyroscopes to estimate stride length and motion range in healthy individuals and patients with coxarthritis (Salarian et al., 2013). In this study, we aim to assess the precision of sagittal joint angle estimations using strain sensors while minimizing sensor count. \u0000Methods \u0000We conducted a study with ten participants based on our previous work that involved collecting single-leg treadmill running data to monitor lower limb joint angles with piezoresistive strain sensors. Subjects ran on an instrumented treadmill at 8-10 km/h, wearing athletic pants embedded with nine strain sensors located on the hip, knee, and ankle. Optical motion capture provided reference kinematics. Our prior research achieved less than 1.5° error in the sagittal plane using a machine-learning approach. The current study explores the extent to which sensor reduction is possible without meaningful loss of accuracy. Three evaluation measures were used for assessment: Pearson correlation, dynamic time warping, and root-mean-squared error. \u0000Results \u0000The results from our correlation analysis will be used to develop a model that optimally balances between accuracy and minimizing the number of sensors. This has practical implications in sports science, where athletes could benefit from less intrusive and more comfortable performance monitoring, and in healthcare, for remote monitoring of patients with mobility issues. \u0000References \u0000Gholami, M., Napier, C., & Menon, C. (2020). Estimating lower extremity running gait kinematics with a single accelerometer: A deep learning approach. Sensors, 20(10), Article 2939. https://doi.org/10.3390/s20102939 \u0000Hossain, M. S., Bin, Dranetz, J., Choi, H., & Guo, Z. (2022). DeepBBWAE-Net: A CNN-RNN based deep superlearner for estimating lower extremity sagittal plane joint kinematics using shoe-mounted IMU sensors in daily living. IEEE Journal of Biomedical and Health Informatics, 26(8), 3906-3917. https://doi.org/10.1109/jbhi.2022.3165383 \u0000Jiang, X., Napier, C., Hannigan, B., Eng, J. J., & Menon, C. (2020). Estimating vertical ground reaction force during walking using a single inertial sensor. Sensors, 20(15), Article 4345. https://doi.org/10.3390/s20154345 \u0000Lim, H., Kim, B., & Park, S. (2020). Prediction of lower limb kinetics and kinematics during walking by a single IMU on the lower back using machine learning. Sensors, 20(1), Article 130. https://doi.org/10.3390/s20010130 \u0000Salarian, A., Burkhard, P. R., Vingerhoets, F. J. G., Jolles, B. M., & Aminian, K. (2013). A novel approach to reducing number of sensing units for wearable gait analysis sys","PeriodicalId":415194,"journal":{"name":"Current Issues in Sport Science (CISS)","volume":"19 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139861303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of biomechanical risk factors for ACL injury between patients and healthy subjects during exergaming","authors":"M. Haas, A. Martin-Niedecken, Larissa Wild, Leander Schneeberger, Eveline S. Graf","doi":"10.36950/2024.2ciss045","DOIUrl":"https://doi.org/10.36950/2024.2ciss045","url":null,"abstract":"Introduction \u0000Exergaming - physically active gaming - offers great potential for rehabilitation after knee injuries in sports, as it combines physical and cognitive challenges. However, before its use in sports rehabilitation can be recommended as safe and reliable, it is necessary to assess the biomechanics associated with knee injuries - an abducted, internally rotated knee at 10-30° of flexion (Koga et al., 2010). The aim of this study was to compare knee valgus (KV) during 10-30° knee flexion between healthy individuals without previous knee injuries and patients undergoing rehabilitation after knee injuries in three exercises of a high-intensive, immersive exergame (ExerCube). \u0000Methods \u0000The kinematics of 18 healthy subjects (25.2 ± 3.3 years, 9 female) and 6 patients (25.0 ± 5.9 years, 2 female) were recorded using marker-based movement analysis (Vicon) during 25 minutes of exergame training (Sphery Racer, ExerCube). The average maximum KV angle during 10-30° knee flexion was compared between healthy subjects and patients in the squat, jump, and burpee for the right leg using a linear mixed model. \u0000Results \u0000The average maximal KV in the squat was 4.3° for healthy subjects and 4.8° for patients. In the jump, an average maximal KV of 5.9° (healthy subjects) and 6.8° (patients) was found. With an average of 6.9° in the maximal KV of healthy subjects and 8.6° in patients, the burpee showed the highest KV of all exercises. A significant main effect was found for exercise (F(2, 45) = 57.03, p < .001), but not for the difference between groups (F(1, 22) = 0.45, p = 0.51). \u0000Discussion/Conclusion \u0000There are no significant differences in KV between healthy participants and patients undergoing rehabilitation after knee injuries. This indicates that the pre-injury movement pattern was restored in the patients, and it can be assumed that the studied exercises during exergaming are safe for use in this stage of rehabilitation. \u0000References \u0000Koga, H., Nakamae, A., Shima, Y., Iwasa, J., Myklebust, G., Engebretsen, L., Bahr, R., & Krosshaug, T. (2010). Mechanisms for noncontact anterior cruciate ligament injuries: Knee joint kinematics in 10 injury situations from female team handball and basketball. The American Journal of Sports Medicine, 38(11), 2218–2225. https://doi.org/10.1177/0363546510373570","PeriodicalId":415194,"journal":{"name":"Current Issues in Sport Science (CISS)","volume":"21 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139862118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of basic motor competencies and connections with sport participation","authors":"Kathrin Bretz, Ilaria Ferrari, Johanna Kress, C. Herrmann","doi":"10.36950/2024.2ciss032","DOIUrl":"https://doi.org/10.36950/2024.2ciss032","url":null,"abstract":"Introduction\u0000During childhood, children develop their motor competencies. Basic motor competencies (BMC) are a central prerequisite for participation in sport activities (Herrmann et al., 2016) and form the basis for sport-specific skills (Hulteen et al., 2018). In school, children have a choice of formal (e.g. sports club) and informal (free play) settings in which they can engage in sports activities (Neuber & Golenia, 2018). Children who are active in sports clubs have a higher level of BMC (Herrmann et al., 2017).\u0000Methods\u0000As part of the longitudinal study “Development of basic motor competencies in childhood (EMOKK-study)”, funded by the Swiss National Science Foundation (SNSF), the BMC of N = 659 preschool children (51% boys) and N = 393 1st and 2nd grade children (49.4% boys) were assessed at two measurement points. In addition, parent questionnaires were used to assess the children’s sport participation. In initial analyses, the development of BMC was calculated using ANCOVA, with age as a covariate.\u0000Results\u0000Differences between girls and boys could be observed in preschool as well as in 1st and 2nd grade. Boys showed better performance in “object-movement” whereas girls were better in “self-movement”. From first to second grade, sports club participation increased (F(1, 467) = 28.546, p < .001, η2 = .058). In both measurement points, boys were more often active in sport clubs than girls. First and second graders who were active in a sports club performed significantly better in both competence areas (“object-movement”: t1: p < .001, d = .42; t2: p < .001, d = .68; “self-movement”: t1: p = .002, d = .38; t2: p = .001, d = .40) than children who were not.\u0000Discussion\u0000Children who were active in club sports show a higher level of BMC, which seems to persist in the longitudinal section. This indicates an early selection effect and the importance of BMC for club sport. In further analyses, variables on informal sport activities will also be considered.\u0000References\u0000Herrmann, C., Gerlach, E., & Seelig, H. (2016). Motorische Basiskompetenzen in der Grundschule. Begründung, Erfassung und empirische Überprüfung eines Messinstruments [Basic motor competences in primary school. Rationale, assessment and empirical testing of a measurement instrument]. Sportwissenschaft, 46(2), 60–73. https://doi.org/10.1007/s12662-015-0378-8\u0000Herrmann, C., Heim, C., & Seelig, H. (2017). Diagnose und Entwicklung motorischer Basiskompetenzen [Diagnosis and development of basic motor competencies]. Zeitschrift für Entwicklungspsychologie und Pädagogische Psychologie, 49(4), 173–185. https://doi.org/10.1026/0049-8637/a000180\u0000Hulteen, R. M., Morgan, P. J., Barnett, L. M., Stodden, D. F., & Lubans, D. R. (2018). Development of foundational movement skills: A conceptual model for physical activity across the sifespan. Sports Medicine, 48(7), 1533–1540. https://doi.org/10.1007/s40279-018-0892-6\u0000Neuber, N., & Golenia, M. (2018). Lernorte für Kinder und Jugendliche im Sport [Learni","PeriodicalId":415194,"journal":{"name":"Current Issues in Sport Science (CISS)","volume":"177 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139858662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}