Top 10 Sportrxiv Papers Today


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#1. Jump height is a poor indicator of lower limb maximal power output: theoretical demonstration, experimental evidence and practical solutions
Jean-Benoit Morin, Pedro Jiménez-Reyes, Matt Brughelli, Pierre Samozino
Lower limb maximal power output (Pmax) is a key physical component of performance in many sports. During squat jump (SJ) and countermovement jump (CMJ) tests, athletes produce high amounts of mechanical work over a short duration to displace their body mass (i.e. the dimension of mechanical power). Thus, jump height has been frequently used by the sports science and medicine communities as an indicator of Pmax. However, in this article, we contended that SJ and CMJ height are in fact poor indicators of Pmax in trained populations. To support our opinion, we first detailed why, theoretically, jump height and Pmax are not fully related. Specifically, we demonstrated that individual body mass, distance of push-off, optimal loading and force-velocity characteristics confound the jump height-Pmax relationship. We also discussed the poor relationship between SJ or CMJ height and Pmax measured with a force plate based on data reported in the literature, which added to our own experimental evidence. Finally, we discussed the limitations...
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Sample Sizes : None.
Authors: 4
Total Words: 5670
Unqiue Words: 1938

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#2. SONNY LISTON AND THE TORN TENDON
Arturo Tozzi
The first Liston-Clay fight in 1964 is still highly debated, because Liston quitted at the end of the sixth round claiming a left shoulder injury. Here we, based on the visual analysis of Sonny’s movements during the sixth round, show how a left shoulder’s rotator cuff tear cannot be the cause of the boxer failing to answer the bell for the seventh round.
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Sample Sizes : None.
Authors: 1
Total Words: 1745
Unqiue Words: 829

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#3. Prolonged depression of knee extensor torque complexity following eccentric exercise
Jamie Pethick, Katherine Whiteaway, Samantha Lee Winter, Mark Burnley
Neuromuscular fatigue reduces the complexity of muscle torque output. Exercise-induced muscle damage reduces muscle torque output for considerably longer than high-intensity fatiguing contractions. We therefore hypothesized that muscle damaging eccentric exercise would lead to a persistent decrease in torque complexity, whereas fatiguing exercise would not. Ten healthy participants performed five isometric contractions (6 s contraction, 4 s rest) at 50% maximal voluntary contraction (MVC) before, immediately after, 10, 30 and 60 minutes, and 24 hours after eccentric (muscle damaging) and isometric (fatiguing) exercise. Further measures were taken 48 hours and one week after eccentric exercise. Torque and surface EMG signals were sampled continuously. Complexity and fractal scaling were quantified using approximate entropy (ApEn) and detrended fluctuation analysis (DFA). Global, central and peripheral perturbations were quantified using MVCs with femoral nerve stimulation. Complexity decreased following both eccentric (ApEn, mean...
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Authors: 4
Total Words: 9149
Unqiue Words: 2733

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#4. Improving the measurement of TMS-assessed voluntary activation in the knee extensors
Jeanne Dekerle, Aaron Greenhouse-Tucknott, James Wrightson, lisa Schäfer, Paul Ansdell
The present study was designed to test the accuracy, validity, reliability and sensitivity of the main outcomes of alternative methods for the measure of TMS-assessed voluntary activation (VATMS) in the knee extensors. Ten healthy recreationally active males (24 ± 5 years) completed a neuromuscular assessment protocol (NMA) before and immediately after a fatiguing isometric exercise, consisting of two sets of five contractions (50%, 62.5%, 75%, 87.5%, and 100% of Maximal Voluntary Contraction; MVC) with superimposed TMS-evoked twitches (SITs) for calculation of VATMS (1x5C vs. 2x5C). The protocol was performed on two separate occasions for the measurement of between-day reliability. Where deemed appropriate, comparisons were made with a routinely used protocol [i.e. 50%, 75%, and 100% of MVC (1x3C) performed three times (3x3C)] from re-analysed data (Dekerle et al., 2018). Confidence intervals for the measure of a key determinant of VATMS (estimated resting twitch) were similar between 1x5C and 2x5C but improved by six-fold when...
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Sample Sizes : [9, 8, 8, 10, 14]
Authors: 5
Total Words: 9357
Unqiue Words: 3262

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#5. Cognitive Behavioral Therapy combined with physical exercise for depression, anxiety, fatigue and pain in adults with chronic diseases: systematic review and meta-analysis
Paquito Bernard, Romain Ahmed Jérôme, Johan Caudroit, Guillaume Chevance, Carayol Marion, Gourlan Mathieu, Kelsey Needham Dancause, Gregory Moullec
Objective. The present meta-analysis aimed to determine the overall effect of cognitive behavior therapy combined with physical exercise (CBTEx) interventions on depression, anxiety, fatigue, and pain in adults with chronic illness; to identify the potential moderators of efficacy; and to compare the efficacy of CBTEx versus each condition alone (CBT and physical exercise). Methods. Relevant randomized clinical trials, published before July 2017, were identified through database searches in Pubmed, PsycArticles, CINAHL, SportDiscus and the Cochrane Central Register for Controlled Trials. Results. A total of 30 studies were identified. CBTEx interventions yielded small-to-large effect sizes for depression (SMC = -0.34, 95% CI [-0.53; -0.14]), anxiety (SMC = -0.18, 95% CI [-0.34; -0.03]) and fatigue (SMC = -0.96, 95% CI [-1.43; -0.49]). Moderation analyses revealed that longer intervention was associated with greater effect sizes for depression and anxiety outcomes. Low methodological quality was also associated with increased...
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Authors: 8
Total Words: 13676
Unqiue Words: 3846

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#6. A surface electromyographic examination of the serratus anterior during exercise, weight, and order-dependent variations of the bench press
Kyle Boddy, Kyle Rogers, John Scheffey
The purpose of this study was to examine differences in the Electromyography (EMG) amplitude of the serratus anterior between the dumbbell bench press and barbell bench press, controlling for weight, order of sets, and dominance of arm. Forty (40) men aged 22.6 ± 2.5 years who were either college or professional baseball pitchers were block randomized into four exercise order-specific subgroups and then performed, depending on the aforementioned order-specific sections, 5-rep sets of both dumbbell and barbell bench press at both 95 and 135 lbs. Each pitcher was instructed in the proper usage of the exercise and assigned a standardized 90-second rest period between the four sets. After receiving the raw EMG signal, proper band-pass filtering, rectifying, moving average-smoothing, and normalization of the EMG amplitude was commenced in order to extract meaningful EMG amplitude results. Statistically significant differences were assessed through a pair of non-parametric tests in the Mann-Wilcox and Wallis-Kruskal test, and the...
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Sample Sizes : None.
Authors: 3
Total Words: 4962
Unqiue Words: 1796

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#7. ‘Why would you referee?’: An {auto}ethnographic account of a football official.
Charles Ing, John P. Mills
Adopting a creative yet novel autoethnographic approach, this study explores the experiences of the first author, a newly qualified footballing official. In doing so, the study provides a first person account to showcase the realities of refereeing whereby adding to a small pool of refereeing literature in the process. That said, in providing an evocative account with a theoretical analysis, the study looks to both showcase and explain the demands associated with the position. Therefore, by constructing the said narratives in an easy to understand manner, the study looks to showcases the challenges associated with officiating to a broad audience. While, the study gives a viable explanation to why many newly qualified referees drop out from the role, the study hopes to inform and subsequently aid aspiring officials in their ongoing development.
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Sample Sizes : None.
Authors: 2
Total Words: 5253
Unqiue Words: 2220

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#8. A commentary on the importance of controlling for medication use within trials on the effects of exercise on depression and anxiety
Paquito Bernard, Carayol Marion
Antidepressant and anxiolytics drugs may confound our understanding of the effects of exercise on anxiety and depression which may occur through biological pathways (some may act synergistically while others may be antagonistic), behavioural pathways (with indications of poorer exercise adherence for drug users), and indirect pathways (driven by deteriorated health status affecting the exercise capabilities of medication users). Therefore, the use of antidepressant or anxiolytic medications needs to be carefully considered in future studies assessing the effects of exercise on anxiety or depression.
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Sample Sizes : None.
Authors: 2
Total Words: 6190
Unqiue Words: 2034

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#9. KABADDI Analytics
Manojkumar Parmar
Kabaddi is a contact team sport of Indian-origin. It is a highly strategic game and generates a significant amount of data due to its rules. However, data generated from kabaddi tournaments has so far been unused, and coaches and players rely heavily on intuitions to make decisions and craft strategies. This paper provides a quantitative approach to the game of kabaddi. The research derives outlook from an analysis performed on data from the 3rd Standard-style Kabaddi World Cup 2016, organised by the International Kabaddi Federation. The dataset, which consists of 66 entries over 31 variables from 33 matches, was manually curated. This paper discusses and provides a quantitative perspective on traditional strategies and conceptions related to the game of kabaddi such as attack and defence strategies. Multiple hypotheses are built and validated using student’s t-test. This paper further provides a quantitative approach to profile an entire tournament to gain a general understanding of the strengths of various teams. Additionally,...
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Sample Sizes : None.
Authors: 1
Total Words: 6229
Unqiue Words: 2109

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#10. Cognitive (executive) load does not affect self-paced cycling exercise performance.
Darias Holgado, Mikel Zabala, Daniel Sanabria
Objectives: to test the hypothesis that cognitive load (low vs. high load) during 20’ self-paced cycling exercise affect physical performance. Design: A pre-registered (https://osf.io/qept5/), randomized, within-subject design experiment. Methods: 28 trained and experienced male cyclists completed a 20’ time-trial cycling self-paced exercise in two separate session, corresponding to two working memory load conditions: 1-back or 2-back. We measured, power output, heart rate, RPE and mental fatigue. Results: Bayes analyses revealed extreme evidence for the 2-back task being more difficult than the 1-back task (BF10 = 4490). However, the observed data only showed anecdotal evidence for the alternative hypothesis for the power output (BF10= 1.52), but showed moderate evidence for the null hypothesis for the heart rate (BF10 = 0.172), anecdotal evidence for RPE (BF10 = 0.72) and anecdotal evidence for mental fatigue (BF10 = 0.588). Conclusions: Our data challenge the idea that self-paced exercise is regulated by top-down processing...
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Authors: 3
Total Words: 4880
Unqiue Words: 1994

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