Sports Technology最新文献_第2页

Tensiomyography reliability and prediction of changes in muscle force following heavy eccentric strength exercise using muscle mechanical properties 使用肌肉力学特性的张力图可靠性和预测重型偏心力量锻炼后肌肉力量的变化

Sports Technology Pub Date : 2015-04-03 DOI: 10.1080/19346182.2015.1117475

R. Á. de Paula Símola, N. Harms, C. Raeder, M. Kellmann, T. Meyer, M. Pfeiffer, A. Ferrauti

{"title":"Tensiomyography reliability and prediction of changes in muscle force following heavy eccentric strength exercise using muscle mechanical properties","authors":"R. Á. de Paula Símola, N. Harms, C. Raeder, M. Kellmann, T. Meyer, M. Pfeiffer, A. Ferrauti","doi":"10.1080/19346182.2015.1117475","DOIUrl":"https://doi.org/10.1080/19346182.2015.1117475","url":null,"abstract":"Abstract The current study involved the completion of two distinct experiments. Experiment 1 analyzed the inter-day reliability of tensiomyography (TMG) muscle mechanical properties based on the amplitude of the muscle belly radial deformation, the time it takes to occur, and its velocity under maximal and submaximal stimuli, in the muscles rectus femoris, biceps femoris, and gastrocnemius lateralis, from 20 male sport students. Experiment 2 investigated whether changes in maximal voluntary isometric contraction (MVIC) could be predicted based on changes in TMG properties following 24 h after different squat training protocols (MS = multiple sets; DS = drop sets; EO = eccentric overload; FW = flywheel; PL = plyometrics) executed by 14 male strength trained athletes. Maximal electrical stimulation exhibited higher level of reliability. In most of the cases, TMG properties Tc, Td, Dm, V10, and V90 showed ICC scores >.8 and CV <10%. Simple linear regression analysis revealed that changes in Dm, V10, and V90 correlated with changes in MVIC following EO at r = .705, .699, and .695, respectively. TMG is a reliable method to assess muscle mechanical properties particularly within maximal stimuli and can be used for prediction of changes in MVIC following heavy eccentric strength exercises.","PeriodicalId":237335,"journal":{"name":"Sports Technology","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115901566","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}

引用次数: 23

Vertical jump diagnosis for multiple athletes using a wearable inertial sensor unit 使用可穿戴惯性传感器单元的多运动员垂直跳跃诊断

Sports Technology Pub Date : 2015-04-03 DOI: 10.1080/19346182.2015.1117476

T. Jaitner, Marcus Schmidt, Kevin Nolte, C. Rheinländer, Sebastian Wille, N. Wehn

{"title":"Vertical jump diagnosis for multiple athletes using a wearable inertial sensor unit","authors":"T. Jaitner, Marcus Schmidt, Kevin Nolte, C. Rheinländer, Sebastian Wille, N. Wehn","doi":"10.1080/19346182.2015.1117476","DOIUrl":"https://doi.org/10.1080/19346182.2015.1117476","url":null,"abstract":"Abstract For the diagnosis of jumping performance in field-based conditions, a wearable measurement system based on inertial sensors (inertial measurement unit [IMU]) and a microcontroller unit has been developed to support online monitoring of a group of athletes. Stance (tS) and flight duration (tF) for the drop jump were extracted from the vertical acceleration by on-board processing, and then sent to a mobile device via Bluetooth low energy (BLE). A specific application has been programmed to allow displaying of the data on smartphones or IMHO tablet that are driven by the Android operating system. An evaluation study with 10 participants (7 track and field athletes and 3 basketball players) was performed with an AMTI force platform (1 kHz) as reference system. Out of 150 drop jumps from different heights (31.5, 40, and 50 cm) 94% were detected correctly. tS and tF showed mean differences of 3.40 ± 2.97 ms and 4.87 ± 3.85 ms, respectively, between force platform and IMU. Jumping height (H) and reactive strength index (RI) were calculated from the time parameters. Corresponding values were 0.59 ± 0.47 cm (H), and 0.06 ± 0.05 (RI). Bland–Altman plots derive a 95% level of agreement in the range from 9.82 to −8.13 s for tS, 15.02 to −11.40 ms for tF, and 0.16 to −0.16 for RI.","PeriodicalId":237335,"journal":{"name":"Sports Technology","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125942834","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}

引用次数: 12

Using binocular pupillometry method for evaluating the functional state of persons 用双眼瞳孔测量法评价人的功能状态

Sports Technology Pub Date : 2015-04-03 DOI: 10.1080/19346182.2015.1117478

I. Matveev, N. N. Varchenko, K. Gankin

引用次数: 2

Detecting repetitions and time features in resistance training using triaxial accelerometry 用三轴加速度计检测阻力训练中的重复和时间特征

Sports Technology Pub Date : 2015-04-03 DOI: 10.1080/19346182.2015.1064935

N. Brown, Sebastian Bichler, W. Alt

{"title":"Detecting repetitions and time features in resistance training using triaxial accelerometry","authors":"N. Brown, Sebastian Bichler, W. Alt","doi":"10.1080/19346182.2015.1064935","DOIUrl":"https://doi.org/10.1080/19346182.2015.1064935","url":null,"abstract":"Accurately determining resistance-training parameters is crucial to gain knowledge about the training process and to evaluate training interventions. To current knowledge, no method exists to automatically detect a series of features in a repetition training session using one three-dimensional accelerometer. In this study, a specific algorithm was used to detect the number of repetitions and different time features. Features determined by the acceleration algorithm were compared to a reference system using a linear wire encoder to detect movements. A total of 50 healthy participants were randomly assigned to three different groups (maximal strength, hypertrophy, and muscular endurance) and executed three different resistance-training exercises (bench press, leg press, and trunk flexion). Results of both measurement systems were compared for agreement using Bland–Altman plots, regarding repetition numbers, TUT (time under tension) in concentric, eccentric, and isometric contraction forms and total TUT (sum of all contraction forms) as well as break between repetitions. Both methods showed high agreement in repetition count (mean error − 0.2 ± 0.6 repetitions). Time features were detected with less agreement, with 10.0% disagreement for TUT in first phase, 1.1% disagreement for second phase, and 56% disagreement in isometric contraction. However, it was possible to detect a series of time-based movement features, enhancing the possibility to objectively record different parameters of a resistance training session. This will improve research in resistance training and also bring advantages in the training process for coach and athlete.","PeriodicalId":237335,"journal":{"name":"Sports Technology","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121922582","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}

引用次数: 4

On the development of inexpensive speed and position tracking system for swimming 廉价游泳速度位置跟踪系统的研制

Sports Technology Pub Date : 2015-04-03 DOI: 10.1080/19346182.2015.1117477

Soeren Trangbaek, Cuno Rasmussen, T. Andersen

引用次数: 4

Agreement between Powertap, Quarq and Stages power meters for cross-country mountain biking Powertap, Quarq和Stages的越野山地自行车功率计协议

Sports Technology Pub Date : 2015-04-03 DOI: 10.1080/19346182.2015.1108979

Matthew C Miller, P. W. Macdermid, P. Fink, S. Stannard

{"title":"Agreement between Powertap, Quarq and Stages power meters for cross-country mountain biking","authors":"Matthew C Miller, P. W. Macdermid, P. Fink, S. Stannard","doi":"10.1080/19346182.2015.1108979","DOIUrl":"https://doi.org/10.1080/19346182.2015.1108979","url":null,"abstract":"Abstract Advances in technology have made the use of a variety of power meters ubiquitous in road cycling along with an ever-increasing popularity during mountain biking. This study compared data from one bicycle using three power meters: Stages (non-driveside crank arm); Quarq (chainring spider); and Powertap (rear-wheel hub). While no differences (p > .05) between power meters were present during treadmill riding at high or low cadences, dissimilarities for both power (W) and cadence (rpm) were apparent during actual cross-country mountain bike riding. Frequency distribution and analysis of coasting indicate that the Stages records more time (p < .001) at zero watts (6.9 ± 3.3 s) and zero cadence (6.9 ± 3.3 s) compared with Quarq (W = 3.3 ± 1.5 s, rpm = .8 ± .7 s) and Powertap (W = 1.1 ± .8 s, rpm = 3.0 ± 1.2 s). Consequently, significant interactions (power meter × terrain, p = .0351) and main effects (power meter p < .0001, and terrain p < .0001) for power output were present and included: uphill (317.5 ± 50.7, 340.8 ± 52.6, 327.3 ± 48.6 W); downhill (127.6 ± 12.3, 147.4 ± 23.8, 160.1 ± 24.0 W); and flat (201.1 ± 21.6, 225.2 ± 27.2, 224.0 ± 29.6 W) for the Stages, Quarq and Powertap, respectively. It is likely that accelerometry (Stages) compared with reed switch (Powertap and Quarq) technology to determine cadence, resulted in the discrepancies between power meters. However, while the reliability of the different methods appears acceptable for intermittent exercise such as cross-country mountain biking, the validity of each in such a situation requires confirming.","PeriodicalId":237335,"journal":{"name":"Sports Technology","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126990038","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}

引用次数: 15

Full-body movement pattern recognition in climbing* 攀爬中的全身运动模式识别*

Sports Technology Pub Date : 2014-10-02 DOI: 10.1080/19346182.2014.968250

L. Seifert, Vladislavs Dovgalecs, Jérémie Boulanger, D. Orth, R. Hérault, K. Davids

{"title":"Full-body movement pattern recognition in climbing*","authors":"L. Seifert, Vladislavs Dovgalecs, Jérémie Boulanger, D. Orth, R. Hérault, K. Davids","doi":"10.1080/19346182.2014.968250","DOIUrl":"https://doi.org/10.1080/19346182.2014.968250","url":null,"abstract":"The aim of this study was to propose a method for full-body movement pattern recognition in climbing, by computing the 3D unitary vector of the four limbs and pelvis during performance. One climber with an intermediate skill level traversed two easy routes of similar rates of difficulty (5c difficulty on French scale), 10m in height under top-rope conditions. The first route was simply designed to allow horizontal edge-hold grasping, while the second route was designed with more complexity to allow both horizontal and vertical edge-hold grasping. Five inertial measurement units (IMUs) were attached to the pelvis, both feet and forearms to analyse the 3D unitary vector of each limb and pelvis. Cluster analysis was performed to detect the number of clusters that emerged from coordination of the four limbs and pelvis during climbing performance. Analysis revealed 22 clusters with 11 clusters unique across the two routes. Six clusters were unique to the simple hold design route and five clusters emerged only in the complex hold design route. We conclude that clustering supported identification of full-body orientations during traversal, representing a level of analysis that can provide useful information for performance monitoring in climbing.","PeriodicalId":237335,"journal":{"name":"Sports Technology","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126278455","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}

引用次数: 10

Movement phase detection in climbing* 攀爬运动相位检测*

Sports Technology Pub Date : 2014-10-02 DOI: 10.1080/19346182.2015.1064128

Vladislavs Dovgalecs, Jérémie Boulanger, D. Orth, R. Hérault, Jean‐François Coeurjolly, K. Davids, L. Seifert

{"title":"Movement phase detection in climbing*","authors":"Vladislavs Dovgalecs, Jérémie Boulanger, D. Orth, R. Hérault, Jean‐François Coeurjolly, K. Davids, L. Seifert","doi":"10.1080/19346182.2015.1064128","DOIUrl":"https://doi.org/10.1080/19346182.2015.1064128","url":null,"abstract":"The aim of this study was to propose a method to automatically detect the different types of behavioural states in climbing. One climber traversed an easy route (5c difficulty on French scale) of 10 m height with a top-rope. Five inertial measurement units (IMU) (3D accelerometer, 3D gyroscope, 3D magnetometer) were attached to the pelvis, both feet and forearms to analyse the direction (3D unitary vector) of each limb and pelvis in ambient space. Segmentation and classification processes supported detection of movement and immobility phases for each IMU. Depending on whether limbs and/or pelvis were moving, four states of behaviour were detected: immobility (absence of limb and pelvis motion), hold exploration (absence of pelvis motion but at least one limb in motion), pelvis movement (pelvis in motion but absence of limb motion) and global motion (pelvis in motion and at least one limb in motion). Results indicated that the climber spent 10% of time immobile, 65% exploring holds, 1% with pelvis in motion (indicating posture regulation) and 24% in global movement (could indicate transition between holds). This new method allows automatic, rapid and reliable detection of climbing behavioural states to facilitate assessment and monitoring of climbing performance.","PeriodicalId":237335,"journal":{"name":"Sports Technology","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121400096","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}

引用次数: 3

Interaction forces in climbing: cost-efficient complementation of a 6dof instrumentation 攀爬中的相互作用力:6自由度仪器的成本效益补充

Sports Technology Pub Date : 2014-10-02 DOI: 10.1080/19346182.2015.1064127

F. Bauer, M. Simnacher, Urs Stöcker, R. Riener, P. Wolf

引用次数: 3

Climbing pixels – using height field techniques to generate art-based climbing holds 攀爬像素-使用高度场技术生成基于艺术的攀爬点

Sports Technology Pub Date : 2014-10-02 DOI: 10.1080/19346182.2015.1063909

Stuart Lim Beekmeyer

引用次数: 0