{"title":"Repeated Sprint Variations According to Circadian Rhythm at Different Menstrual Cycle Phases.","authors":"Tugba Nilay Kulaksız, Şükran Nazan Koşar, Tahir Hazir, Ayse Kin-Isler","doi":"10.1055/a-2397-8974","DOIUrl":"10.1055/a-2397-8974","url":null,"abstract":"<p><p>This study assessed the repeated sprint performance in relation to circadian rhythm during different menstrual cycle phases (MCP). Twelve volunteer eumenorrheic women team sport athletes performed 5×6-s cycling sprints in morning (9 am to 10 am) and evening (6 pm to 7 pm) sessions during the mid-follicular (FP, 6<sup>th</sup>-10<sup>th</sup> d) and luteal phases (LP, 19<sup>th</sup>-24<sup>th</sup> d). Body weight, oral body temperature, resting heart rate and lactate levels together with estradiol, progesterone and cortisol levels were determined before tests. Relative peak and mean power and performance decrements were determined as performance variables and maximum heart rate, lactate and ratings of perceived exertion were determined as physiological variables. Evening body temperatures were significantly higher. Cortisol levels were higher in the morning and in the FP. Resting lactate levels did not vary with MCP or time of day, but a significant MCP x time of day interaction was observed. Body weight showed no change according to time of day and MCP. There was no significant effect of MCP and time of day on performance and physiological variables, in contrast, maximum lactate values were notably higher in the evening. In conclusion, MCP and time of day need not be considered during repeated sprint exercises of eumenorrheic women athletes.</p>","PeriodicalId":14439,"journal":{"name":"International journal of sports medicine","volume":" ","pages":"41-50"},"PeriodicalIF":2.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142017438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Single Nucleotide Polymorphisms and Tendon/Ligament Injuries in Athletes: A Systematic Review and Meta-analysis.","authors":"Yumi Fukuyama, Haruka Murakami, Motoyuki Iemitsu","doi":"10.1055/a-2419-4359","DOIUrl":"10.1055/a-2419-4359","url":null,"abstract":"<p><p>This systematic review and meta-analysis aimed to identify the association between genetic polymorphisms and tendon and ligament injuries in adolescent and adult athletes of multiple competition sports. The PubMed, Web of Science, EBSCO, Cochrane Library, and MEDLINE databases were searched until July 7, 2023. Eligible articles included genetic studies on tendon and ligament injuries and comparisons between injured and non-injured athletes. This review included 31 articles, comprising 1,687 injury cases and 2,227 controls, from a meta-analysis of 12 articles. We identified 144 candidate gene polymorphisms (only single nucleotide polymorphisms were identified). The meta-analyses included vascular endothelial growth factor A (VEGFA) rs699947, collagen type I alpha 1 rs1800012, collagen type V alpha 1 rs12722, and matrix metalloproteinase 3 rs679620. The VEGFA rs699947 polymorphism showed a lower risk of injuries in athletes with the C allele ([C vs. A]: OR=0.80, 95% CI: 0.65-0.98, <i>I</i> <sup>2</sup> <i>=</i>3.82%, <i>p</i>=0.03). The risk of these injuries were not affected by other polymorphisms. In conclusion, the VEGFA rs699947 polymorphism is associated with the risk of tendon and ligament injuries in athletes. This study provides insights into genetic variations that contribute to our understanding of the risk factors for such injuries in athletes.</p>","PeriodicalId":14439,"journal":{"name":"International journal of sports medicine","volume":" ","pages":"3-21"},"PeriodicalIF":2.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142500515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wladimir Rafael Beck, Pedro Paulo Menezes Scariot, Marcelo Papoti, Taciane Maria Melges Pejon, Emanuel Elias Camolese Polisel, Fúlvia Barros Manchado-Gobatto, Claudio Alexandre Gobatto
{"title":"Living High-Training Low on Mice Bone Parameters Analyzed through Complex Network Approach.","authors":"Wladimir Rafael Beck, Pedro Paulo Menezes Scariot, Marcelo Papoti, Taciane Maria Melges Pejon, Emanuel Elias Camolese Polisel, Fúlvia Barros Manchado-Gobatto, Claudio Alexandre Gobatto","doi":"10.1055/a-2361-2840","DOIUrl":"10.1055/a-2361-2840","url":null,"abstract":"<p><p>The aim of this study was to investigate the effect of 8 weeks of hypoxic exposition and physical training on healthy mice femur outcomes analyzed through conventional statistic and complex networks. The mice were divided into four groups, subjected to physical training (T; 40 min per day at 80% of critical velocity intensity) or not (N), exposed to hypoxic environment (\"Living High-Training Low\" model - LHTL; 18 h per day, FIO<sub>2</sub>=19.5%; Hyp) or not (Nor). The complex network analysis performed interactions among parameters using values of critical \"r\" of 0.5 by Pearson correlations to edges construction, with Fruchterman-Reingold layout adopted for graph visualization. Pondered Degree, Betweenness, and Eigenvector metrics were chosen as centrality metrics. Two-way ANOVA, t-test and Pearson correlation were used with P<0.05. Femur phosphorus of T-Hyp was higher than all other groups (P<0.05) and correlated with bone density (r=0.65; P=0.042), bone mineral density (r=0.67; P=0.034) and% of mineral material (r=0.66, P=0.038). Overall, the complex network demonstrated improvements in bone volume, % of mineral material, bone density, and bone mineral density for T-Hyp over other groups. Association of physical training and hypoxia improved bone quality for healthy mice.</p>","PeriodicalId":14439,"journal":{"name":"International journal of sports medicine","volume":" ","pages":"32-40"},"PeriodicalIF":2.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142620677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dayanne Sampaio Antonio, Maressa Priscilla Krause, Edilson Fernando de Borba, Anderson Zampier Ulbrich, Cosme Franklim Buzzachera, Sergio Gregorio Silva
{"title":"Fractional utilization of the 10-minute treadmill test velocity in running performance.","authors":"Dayanne Sampaio Antonio, Maressa Priscilla Krause, Edilson Fernando de Borba, Anderson Zampier Ulbrich, Cosme Franklim Buzzachera, Sergio Gregorio Silva","doi":"10.1055/a-2408-7467","DOIUrl":"10.1055/a-2408-7467","url":null,"abstract":"<p><p>This study aimed to evaluate the applicability of the 10-minute submaximal treadmill test (T10 test), a self-paced test, in determining critical speed (CS) and predicting running performance. Specifically, we sought to identify the percentage of T10 velocity (vT10) that runners performed in official distance races, and to compare physiological and performance indicators between sexes. 60 recreational runners (n=34 males and n=26 females) underwent a maximum incremental test, the novel T10 test, and ran 1200-m and 2400-m on the track. Runners self-reported their best performance times. Generalized Linear Model was used to compare running performances between sexes. For both males and females, the %vT10 in 5 km, 10 km, and half-marathon races occurred at 107.5% and 106.5%, 99.9% and 100.8%, and 92.6% and 97.1%, respectively. There was no interaction effect (p=0.520) and no main effect of sex (p=0.443). There was a main effect of distance (p<0.001), indicating that %vT10 in the 5km race differed from that found in the 10 km race (p=0.012), as well as in the half-marathon (p<0.001). Our findings suggest that %vT10 values can be used to determine pace in recreational endurance runners for race distances regardless of sex.</p>","PeriodicalId":14439,"journal":{"name":"International journal of sports medicine","volume":" ","pages":"51-58"},"PeriodicalIF":2.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142125620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Influence of Adolescent Physical Activity on Bone Mineral Density among Adult Runners.","authors":"Nodoka Ikegami, Akiko Hatsukari, Toshinao Kamikubo, Ryota Yamamoto, Toshiharu Tsutsui, Suguru Torii","doi":"10.1055/a-2393-3391","DOIUrl":"10.1055/a-2393-3391","url":null,"abstract":"<p><p>This study aimed to determine the influence of sport type and training volume during adolescence on low bone mineral density (BMD) in long-distance runners. In total, 125 competitive long-distance runners (64 males; 21.3±4.2 years, 61 females; 21.4±3.1 years) participated in this retrospective cohort study. We collected training history data during adolescence using a questionnaire and measured BMD of the lumbar spine and whole body using dual-energy X-ray absorptiometry (DXA). Male runners with low BMD ran for more hours (p=0.02) and had a smaller proportion of multidirectional loading activity (p=0.03) in elementary school than those with normal BMD. Although female runners with low BMD performed multidirectional activity for more hours in middle school than those with normal BMD (p=0.01), running volume was similar between groups. There was an increasing trend in the total number of hours of physical activity in middle school in female runners with low BMD (p=0.05). These results suggest that avoiding specialization in long-distance running, increasing the proportion of multidirectional sports, and preventing overload during the bone growth phase may reduce the risk of low BMD among runners.</p>","PeriodicalId":14439,"journal":{"name":"International journal of sports medicine","volume":" ","pages":"59-65"},"PeriodicalIF":2.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142004208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Inhalation of Hydrogen-rich Gas before Acute Exercise Alleviates Exercise Fatigue: A Randomized Crossover Study.","authors":"Gengxin Dong, Jianxin Wu, Yinglu Hong, Qian Li, Meng Liu, Guole Jiang, Dapeng Bao, Brad Manor, Junhong Zhou","doi":"10.1055/a-2318-1880","DOIUrl":"10.1055/a-2318-1880","url":null,"abstract":"<p><p>Hydrogen, as an antioxidant, may have the potential to mitigate fatigue and improve selected oxidative stress markers induced by strenuous exercise. This study focused on a previously unexplored approach involving pre-exercise inhalation of hydrogen-rich gas (HRG). Twenty-four healthy adult men first completed pre-laboratories to determine maximum cycling power (W<sub>max</sub>) and maximum cycling time (T<sub>max</sub>). Then they were subjected to ride T<sub>max</sub> at 80% W<sub>max</sub> and 60-70 rpm on cycle ergometers after inhaled HRG or placebo gas (air) for 60-minute in a double-blind, counterbalanced, randomized, and crossover design. The cycling frequency in the fatigue modeling process and the rating of perceived exertion (RPE) at the beginning and end of the ride were recorded. Before gas inhalation and after fatigue modeling, visual analog scale (VAS) for fatigue and counter-movement jump (CMJ) were tested, and blood samples were obtained. The results showed that compared to a placebo, HRG inhalation induced significant improvement in VAS, RPE, the cycling frequency during the last 30 seconds in the fatigue modeling process, the ability to inhibit hydroxyl radicals, and serum lactate after exercise (p<0.028), but not in CMJ height and glutathione peroxidase activity. The cycling frequency during the last 30 seconds of all other segments in the fatigue modeling process was within the range of 60-70 rpm. In conclusion, HRG inhalation prior to acute exercise can alleviate exercise-induced fatigue, maintain functional performance, and improve hydroxyl radical and lactate levels.</p>","PeriodicalId":14439,"journal":{"name":"International journal of sports medicine","volume":" ","pages":"1014-1022"},"PeriodicalIF":2.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140848879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Thomas G Balshaw, Emmet J McDermott, Garry J Massey, Chris Hartley, Pui Wah Kong, Tom Maden-Wilkinson, Jonathan Folland
{"title":"Smaller Biceps Femoris Aponeurosis Size in Legs with a History of Hamstring Strain Injury.","authors":"Thomas G Balshaw, Emmet J McDermott, Garry J Massey, Chris Hartley, Pui Wah Kong, Tom Maden-Wilkinson, Jonathan Folland","doi":"10.1055/a-2348-2605","DOIUrl":"10.1055/a-2348-2605","url":null,"abstract":"<p><p>Biceps femoris long head (BF<sub>LH</sub>) aponeurosis size was compared between legs with and without prior hamstring strain injury (HSI) using two approaches: within-group (injured vs. uninjured legs of previous unilateral HSI athletes) and between-group (previously injured legs of HSI athletes vs. legs of No Prior HSI athletes). MRI scans were performed on currently healthy, competitive male athletes with Prior HSI history (<i>n</i>=23;≥1 verified BF<sub>LH</sub> injury; including a sub-group with unilateral HSI history; most recent HSI 1.6±1.2 years ago) and pair-matched athletes with No Prior HSI history (<i>n</i>=23). Anonymized axial images were manually segmented to quantify BF<sub>LH</sub> aponeurosis and muscle size. Prior unilateral HSI athletes' BF<sub>LH</sub> aponeurosis maximum width, aponeurosis area, and aponeurosis:muscle area ratio were 14.0-19.6% smaller in previously injured vs. contralateral uninjured legs (paired t-test, 0.008≤P≤0.044). BF<sub>LH</sub> aponeurosis maximum width and area were also 9.4-16.5% smaller in previously injured legs (<i>n</i>=28) from Prior HSI athletes vs. legs (<i>n</i>=46) of No Prior HSI athletes (unpaired t-test, 0.001≤P≤0.044). BF<sub>LH</sub> aponeurosis size was smaller in legs with prior HSI vs. those without prior HSI. These findings suggest BF<sub>LH</sub> aponeurosis size, especially maximum width, could be a potential cause or consequence of HSI, with prospective evidence needed to support or refute these possibilities.</p>","PeriodicalId":14439,"journal":{"name":"International journal of sports medicine","volume":" ","pages":"871-883"},"PeriodicalIF":2.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141426822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Weiyan Ren, Yan Wang, Zhaoqi Yan, Zhaowei Chu, Fan Yang, Yih-Kuen Jan, Jie Yao, Fang Pu
{"title":"Adaptive Changes in Longitudinal Arch During Long-distance Running.","authors":"Weiyan Ren, Yan Wang, Zhaoqi Yan, Zhaowei Chu, Fan Yang, Yih-Kuen Jan, Jie Yao, Fang Pu","doi":"10.1055/a-2362-1267","DOIUrl":"10.1055/a-2362-1267","url":null,"abstract":"<p><p>This study investigates the biomechanical adaptations of the longitudinal arch (LA) in long-distance runners, focusing on changes in stiffness, angle, and moment during a 60-minute run. Twenty runners participated in this experiment, and were asked to run at a speed of 2.7 m·s<sup>-1</sup> for 60 minutes. The kinematic and kinetic data collected at five-minute intervals during running were calculated, including the stiffness of LA in the loading phase (<i>k</i> <sub>load</sub> ) and the stiffness of LA in the unloading phase (<i>k</i> <sub>unload</sub> ), the maximum LA moment (<i>M</i> <sub>max</sub> ), the range of LA angle change (<i>∆θ</i> <sub>range</sub> ), and the maximum LA angle change (<i>∆θ</i> <sub>max</sub> ). Foot morphology was also scanned before and after running. Variations of kinematic and kinetic data were analyzed throughout the running activity, as well as variations of foot morphology pre- and post-run. Results showed that there was a significant decrease in <i>k</i> <sub>load</sub> (p<0.001), coupled with increases in <i>∆θ</i> <sub>range</sub> (p=0.002) and <i>∆θ</i> <sub>max</sub> (p<0.001), during the first 15 minutes of running, which was followed by a period of mechanical stability. No differences were found in <i>k</i> <sub>unload</sub> and <i>M</i> <sub>max</sub> throughout the running process and the foot morphology remained unchanged after running. These results highlight a critical adaptation phase that may be pivotal for improving running economy and performance.</p>","PeriodicalId":14439,"journal":{"name":"International journal of sports medicine","volume":" ","pages":"1091-1098"},"PeriodicalIF":2.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141859695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lavínia Vivan, Vinicius Ribeiro Dos Anjos, Paulo Engelke, Claudio Andre Barbosa de Lira, Rodrigo Luiz Vancini, Katja Weiss, Beat Knechtle, Marília Santos Andrade
{"title":"Cycling Intensity Effect on Running Plus Cycling Performance among Triathletes.","authors":"Lavínia Vivan, Vinicius Ribeiro Dos Anjos, Paulo Engelke, Claudio Andre Barbosa de Lira, Rodrigo Luiz Vancini, Katja Weiss, Beat Knechtle, Marília Santos Andrade","doi":"10.1055/a-2404-8537","DOIUrl":"10.1055/a-2404-8537","url":null,"abstract":"<p><p>Running performance is crucial for triathlon performance. However, the prior bout of cycling may affect the running split time. This study compared the triathletes' cycling plus running (C+R) time, when cycling was performed at three different intensities and running was maximal. A total of 38 athletes (21 males and 17 females) were included. Body composition, maximal oxygen uptake, and functional threshold power (FTP) was evaluated. The participants visited the laboratory three times to cycle 20 km at 80%, 85%, or 90% FTP (in randomized order) and run 5 km as fast as possible. Males ran faster after cycling at 80% FTP than after cycling at 90% FTP (mean difference=35.1 s; CI% 2.2, 68.1 s; p=0.035). The C+R time was faster when cycling at 90% FTP than at 80% FTP (mean difference=57.7 s; CI% 26.1, 89.3 s; p<0.001). For females, no significant difference was observed in the running time after cycling at 80%, 85%, or 90% FTP. The C+R time was faster when cycling at 90% FTP than at 80% FTP (mean difference=80.9 s; CI% 29.7, 132.1 s; p=0.002). In conclusion, to optimize triathlon performance, male and female athletes should cycle at a minimum of 90% FTP.</p>","PeriodicalId":14439,"journal":{"name":"International journal of sports medicine","volume":" ","pages":"1074-1083"},"PeriodicalIF":2.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142307669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Shoulder Rotation Affects Trapezius Muscle Activity During Shoulder Horizontal Abduction.","authors":"Ilyoung Yu, Minhyeok Kang","doi":"10.1055/a-2358-4759","DOIUrl":"10.1055/a-2358-4759","url":null,"abstract":"<p><p>Shoulder horizontal abduction exercise in the prone position is effective for strengthening the lower trapezius muscle. However, this exercise is difficult for patients with acute pain or those undergoing initial rehabilitation because of the postural characteristics of the exercise. This study aimed to (1) investigate the effect of a shoulder horizontal abduction exercise when performed with a different amount of shoulder rotation on the trapezius muscle activation and scapular anterior/posterior tilt angle and (2) evaluate the effect of shoulder rotation on the acromiohumeral distance while sitting. Fifteen healthy men performed shoulder horizontal abduction exercise in three shoulder positions (internal rotation, neutral rotation, and external rotation). During exercises, we measured trapezius muscle activity using an electromyography system and scapular anterior/posterior tilt angle using an inclinometer application. We also measured the acromiohumeral distance using real-time ultrasonography before the exercises. Increases in lower trapezius and middle trapezius muscle activities and a decrease in scapular anterior tilt occurred in shoulder external rotation compared with other positions (p<0.001). Shoulder external rotation also significantly increased acromiohumeral distance in the sitting position (p<0.05). We propose that shoulder external rotation effectively and safely increases middle and lower trapezius muscle activities during the sitting shoulder horizontal abduction exercise.</p>","PeriodicalId":14439,"journal":{"name":"International journal of sports medicine","volume":" ","pages":"980-986"},"PeriodicalIF":2.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141859698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}