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Research in Sports Medicine

Filipe Manuel Clemente, Hugo Sarmento, Alireza Rabbani, Cornelis M I Niels Van Der Linden, Mehdi Kargarfard, Israel Teoldo Costa
This study compared the relative physical demands of official matches and sided games (medium and large) in professional soccer players by means of a global positioning system. Twenty-three professional male soccer players (24.63[Formula: see text]2.84 years old; 180.94[Formula: see text]6.49 cm; 77.19[Formula: see text]6.46 kg; 52.99[Formula: see text]5.01 VO2max ) participated in the study. Total distance, running distance, sprinting distance, number of sprints, and acceleration sum were quantified per minute to compare the different games...
August 21, 2018: Research in Sports Medicine
Panagiota Dragonea, Emmanuil Zacharakis, Stylianos Kounalakis, Nikolaos Kostopoulos, Theodoros Bolatoglou, Nikolaos Apostolidis
The purpose of the present study was to define the maximal lactate steady state (MLSSmeas ) in high-level male basketball players and to compare it with the lactate turnpoint (LTP) and the respective point derived form a prediction method (MLSScal ). Twelve high-level basketball players underwent one maximal and several submaximal tests on a treadmill on different days where MLSS and LTP were measured. MLSSmeas was observed at 75% of the maximal treadmill speed, at 77% of VO2max , at 88% of HRmax and at [La- ] of 3...
August 20, 2018: Research in Sports Medicine
Laura E Stanley, Matthew Harkey, Brittney Luc-Harkey, Barnett S Frank, Brian Pietrosimone, J Troy Blackburn, Darin A Padua
The purpose of this study was to examine associations between ankle dorsiflexion (ankle-DF) displacement and knee and hip kinematics and kinetics during a jump-landing task in females following anterior cruciate ligament reconstruction (ACLR). Females (n = 23) with a history of unilateral ACLR (≥ 6-months post-ACLR) underwent a three-dimensional lower extremity biomechanical evaluation. Pearson Product Moment (r) correlations assessed associations between ankle-DF displacement and knee and hip kinematic and kinetic variables...
August 7, 2018: Research in Sports Medicine
Athos Trecroci, Stefano Longo, Enrico Perri, F Marcello Iaia, Giampietro Alberti
The aim of the current study was to evaluate field-based physical performance of under 16 years (U16) elite and sub-elite soccer players. Forty elite (n = 20) and sub-elite (n = 20) soccer players were enrolled and tested for countermovement jump (CMJ), 10-m sprint and agility, in terms of sprint with 90° turns (S90), S90 with ball, Slalom, Slalom with ball, and reactive agility (RAT). Statistical and practical significant differences were observed in CMJ, S90 and RAT between elite and sub-elite. Elite players exhibited a likely better performance in Slalom, Slalom with ball and S90 with ball despite a non-significant difference by level of play...
August 3, 2018: Research in Sports Medicine
Martin D Hoffman, Trent Stellingwerff, Ricardo J S Costa
It is not unusual for those participating in ultra-endurance (> 4 hr) events to develop varying degrees of either hypohydration or hyperhydration. Yet, it is important for ultra-endurance athletes to avoid the performance limiting and potentially fatal consequences of these conditions. During short periods of exercise (< 1 hr), trivial effects on the relationship between body mass change and hydration status result from body mass loss due to oxidation of endogenous fuel stores, and water supporting the intravascular volume being generated from endogenous fuel oxidation and released with glycogen oxidation...
July 28, 2018: Research in Sports Medicine
Ricardo J S Costa, Martin D Hoffman, Trent Stellingwerff
Ultra-endurance activities (≥ 4h) present unique challenges that, beyond fatigue, may be exacerbated by sub-optimal nutrition during periods of increased requirements and compromised gastrointestinal function. The causes of fatigue during ultra-endurance exercise are multi-factorial. However, mechanisms can potentially include central or peripheral fatigue, thermal stress, dehydration, and/or endogenous glycogen store depletion; of which optimising nutrition and hydration can partially attenuate. If exercise duration is long enough (e...
July 28, 2018: Research in Sports Medicine
Jian Yao, Qipeng Song, Kai Zhang, Youlian Hong, Weiping Li, Dewei Mao, Yan Cong, Jing Xian Li
Diffusion tensor imaging (DTI) measures the displacement of water molecules across tissue components and thus provides information on the microstructure of brain white matter. This study examined the effect of Tai Chi and the relation of Tai Chi experiences and skills with brain white matter. Fractional anisotropy (FA) was obtained from the DTI magnetic resonance images of two group participants, namely, the long-term Tai Chi practitioners and sedentary counterparts. Whole-brain voxel-based analysis showed that the Tai Chi group had higher FA in the splenium of corpus callosum (p = 0...
July 27, 2018: Research in Sports Medicine
Julian Wienert, Tim Kuhlmann, Vera Storm, Dominique Reinwand, Sonia Lippke
EHealth behaviour change interventions that help participants to adhere to professional physical activity recommendations can help to prevent future events of cardiovascular diseases (CVD). Therefore, identifying user groups of such interventions based on stages of health behaviour change is of great importance to provide tailored content to users instead of one-size-fits-all approaches. Our study used Latent Class Analysis (LCA) to identify underlying classes of users of an eHealth behaviour change intervention based on stages of change and associated variables...
July 26, 2018: Research in Sports Medicine
Alan M Nevill, Arthur D Stewart, Tim Olds, Michael J Duncan
Our aim was to identify the best anthropometric index associated with waist adiposity. The six weight-status indices included body mass index (BMI), waist-to-hip ratio (WHR), waist-to-height ratio (WHTR), and a new waist-by-height0.5 ratio (WHT.5R). The association between three waist skinfolds and the six anthropometric indices was conducted using ANCOVA, MANCOVA, allometric modelling and non-linear regression. The strongest predictors of waist adiposity were (1st ) WHT.5R, (2nd ) WHTR, (3rd ) waist circumference (WC), (4th ) BMI, (5th ) WHR, and lastly (6th ) a body shape index ABSI = WC/(BMI2/3 * height1/2 )...
July 25, 2018: Research in Sports Medicine
Thomas Gronwald, Olaf Hoos, Sebastian Ludyga, Kuno Hottenrott
Within the last years complex models of cardiovascular regulation and exercise fatigue have implemented heart rate variability (HRV) as a measure of autonomic nervous system. Using detrended fluctuation analysis (DFA) to assess heart rate correlation properties, the present study examines the influence of exercise intensity on total variability and complexity in non-linear dynamics of HRV. Sixteen cyclists performed a graded exercise test on a bicycle ergometer. HRV time domain measures and fractal correlation properties were analyzed using short-term scaling exponent alpha1 of DFA...
July 24, 2018: Research in Sports Medicine
Valdemar Stajer, Milan Vranes, Sergej M Ostojic
Exhaustive exercise induces various disturbances of homeostasis, with impaired bioenergetics often associated with strenuous muscular work. However, no study so far validated serum biomarkers of creatine metabolism vs. traditional markers of exhaustive exercise and fatigue. Here, we investigated how well changes in serum guanidinoacetic acid (GAA), creatine and creatinine correlate with responses in blood lactate, creatine kinase, interleukin-6 and cortisol in 11 young active men (age 23.2 ± 3.7 years; VO2max 49...
July 20, 2018: Research in Sports Medicine
Steven C Cuff, Kathryn Coxe, Julie A Young, Hongmei Li, Honggang Yi, Jingzhen Yang
In 2013, Ohio enacted a law to mitigate consequences of pediatric sports-related concussions. This study aimed to describe changes in clinic visits and symptom duration for pediatric sports-related concussions before and after this law. 3,133 new visits by 2,861 unique patients (10-18 years) presenting between April 2012 and April 2015 for sports-related concussions within 30 days of injury were included. There were 937 (29.9%), 1,132 (36.1%) and 1,064 (34.0%) concussion visits for pre-law, immediate-post law, and post-law periods, respectively...
July 20, 2018: Research in Sports Medicine
Im-Rak Choi, Jung-Hoon Lee
This study aimed to determine the effects of application direction of the kinesiology tape on the strength of fatigued quadriceps muscles, and included 15 athletes (mean: age, 19.53 ± 2.42 years; height, 176.93 ± 6.9 cm; weight, 72.87 ± 13.02 kg). The kinesiology tape was randomly applied to the quadriceps from origin to insertion (n = 7) or from insertion to origin (n = 8) after inducing quadriceps muscle fatigue. After 1 week, the kinesiology tape was applied in the opposite direction (insertion to origin [n = 7] or origin to insertion [n = 8]) after inducing quadriceps muscle fatigue...
July 20, 2018: Research in Sports Medicine
Chloe Xiaoyun Chan, Keng Lin Wong, Shi Jie Toh, Lingaraj Krishna
We conducted an epidemiological study to identify the demographics and pre-operative characteristics of patients undergoing primary anterior cruciate ligament (ACL) reconstruction in a multi-ethnic Asian population. A retrospective study was performed on 696 patients who registered in our ACL reconstruction registry from January 2013 to August 2016. Important inter-ethnic differences were found. Indian patients were significantly older compared to Malay and Chinese patients. Malay and Indian patients were more likely to be male, overweight, and obese compared to Chinese patients...
July 9, 2018: Research in Sports Medicine
Dirk-Wouter Smits, Frank Backx, Henk Van Der Worp, Marienke Van Middelkoop, Fred Hartgens, Evert Verhagen, Bas Kluitenberg, Bionka Huisstede
This study examined the criterion validity of self-reported running-related injuries (RRI) by novice runners. Fifty-eight participants (41 females; age 46 ± 11 yrs) of the "Start-to-Run" program provided self-reports on their RRIs using an online questionnaire. Subsequently, they attended injury consultations with sports medicine physicians who provided physician-reports (blinded for the self-reports) as a reference standard. Self-reports and physician-reports included information on injury location (i...
July 3, 2018: Research in Sports Medicine
Liane E Hunter, Chloe Ifrah, Molly E Zimmerman, Mimi Kim, Richard B Lipton, Walter F Stewart, Michael L Lipton
The effects of soccer-related head impacts, beyond overt concussions, on Patient Reported Outcomes (PROs) have not been explored to date. Generalized estimating equations were employed to determine the association between soccer-related head impacts (headers in the prior 2 weeks, unintentional head impacts in the prior 2 weeks, headers in the prior 12 months and lifetime concussions) on PROs including depression, anxiety, sleep disturbance and sleep impairment. Compared to players with no unintentional head impacts in the prior 2 weeks, players with one unintentional exposure reported more symptoms of anxiety (p = 0...
October 2018: Research in Sports Medicine
Vincenzo Rago, João Silva, Magni Mohr, Morten Randers, Daniel Barreira, Peter Krustrup, António Rebelo
We examined the influence of competitive standard of the opponent on activity profile and fatigue during preseason friendly soccer matches. Time motion analysis was performed in a male professional soccer team (N = 14) during six friendly games played against professional, semi-professional and amateur-level opponents (PL, SPL and AL). The reference team covered higher acceleration distance, acceleration and deceleration > 2 m· s-2 distance against PL than AL (ES = 0.77 to 0.91). Acceleration and deceleration distance > 2 m· s-2 was also higher (ES = 0...
October 2018: Research in Sports Medicine
Rémy Hurdiel, Samantha M Riedy, Gregoire P Millet, Benoit Mauvieux, Thierry Pezé, Charlotte Elsworth-Edelsten, Dudoignon Martin, Gauntier Zunquin, Grégory Dupont
Ninety-two runners completed the study during a 168 km mountain ultramarathon (MUM). Sleepiness, self-reported sleep duration, and cognitive performance were assessed the day before the race and up to eight checkpoints during the race. Sleepiness was assessed using the Karolinska Sleepiness Scale. Cognitive performance was also assessed using the Digital Symbol Substitution Task (DSST). Runner reported 23.40 ± 22.20 minutes of sleep (mean ± SD) during the race (race time: 29.38 to 46.20 hours). Sleepiness and cognitive performance decrements increased across this race, and this was modulated by time-of-day with higher sleepiness and greater performance decrements occurring during the early morning hours...
October 2018: Research in Sports Medicine
Jacopo Antonino Vitale, Valerio Povìa, Nicolò Danilo Vitale, Tito Bassani, Giovanni Lombardi, Luca Giacomelli, Giuseppe Banfi, Antonio La Torre
There is not enough evidence on the impact of different speed endurance training regimes on footballers' ability to perform multiple shuttle run performance. This study examined the effect of 4 weeks of speed endurance maintenance (SEM) and speed endurance production (SEP) training on the 5-meter multiple shuttle run test (5-m MST) performance in young elite soccer players. A parallel two-groups, longitudinal design was used. Fifteen players were divided to either SEM (8 repetitions of 20-s all-out sprint interspersed with 40 s of recovery) or SEP (8 repetitions of 20-s all-out bout interspersed with 120 s of recovery) training group...
October 2018: Research in Sports Medicine
Bruno Mendes, Jose M Palao, André Silvério, Adam Owen, Sandro Carriço, Francisco Calvete, Filipe Manuel Clemente
The study aimed to assess the changes in the perceived internal load and wellness status of volleyball players in preparatory, regular (i.e. uncongested), and congested weeks during a full season. Thirteen elite volleyball players were studied (237 training sessions and 37 official matches). Session-RPE, muscle soreness, stress, fatigue, sleep quality, and the Hooper Index were measured daily using questionnaires. Training sessions were classified based on the number of matches per week and the days before or after a match: preparatory (no match), regular (one match), and congested weeks (two or more matches)...
October 2018: Research in Sports Medicine
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