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International Journal of Sports Physiology and Performance

Volker Scheer, Tanja I Janssen, Solveig Vieluf, Hans-Christian Heitkamp
PURPOSE: Trail running is a complex sport and performance prediction is challenging. Our aim is to evaluate three standard laboratory exercise tests in trail runners and correlate measurements to the race time of a trail competition evaluating its predictive power. METHODS: Nine competitive male trail runners (mean age 31±5.8 years) completed three different laboratory exercise tests (step, ramp and trail test) for determination of VO2 max, vVO2max, ventilatory and lactate thresholds (LT), mechanical power output and running economy (RE) , followed by a 31km trail race...
June 28, 2018: International Journal of Sports Physiology and Performance
Francisco Tavares, Martyn Beaven, Júlia Teles, Dane Baker, Phil Healey, Tiaki B Smith, Matthew Driller
PURPOSE: While the acute effects of cold water immersion (CWI) have been widely investigated, research analysing the effects of CWI over a chronic period in highly-trained athletes is scarce. The aim of this study was to investigate the effects of CWI during an intense three week pre-season phase in elite rugby athletes. METHODS: Twenty-three elite male rugby union athletes were randomized to either CWI (10 min at 10 ºC, n = 10) or a passive recovery control (CON, n = 12) during three-weeks of high volume training...
June 28, 2018: International Journal of Sports Physiology and Performance
Samuel Ryan, Thomas Kempton, Emidio Pacecca, Aaron J Coutts
PURPOSE: To examine the measurement properties of an adductor strength assessment system in professional Australian footballers. METHODS: Observational, longitudinal design. Test-retest reliability data were collected from 18 professional Australian footballers from one club on the same day during the 2017 AFL competition. Week-to-week variation data were collected on 45 professional Australian footballers from one club during the same season at 48, 72 and 120 h post-match (rounds 1-23)...
June 28, 2018: International Journal of Sports Physiology and Performance
Alan Chorley, Richard P Pott, Simon Marwood, Kevin L Lamb
Purpose This study examined the partial reconstitution of the work capacity above critical power (W') following successive bouts of maximal exercise using a new repeated ramp test (RRT), against which the fit of an existing W' balance (W'bal ) prediction model was tested. Methods Twenty active adults, consisting of trained cyclists (n = 9; age 43 ± 15 years; V̇O2max 61.9 ± 8.5 mL∙kg∙min-1 ) and untrained (n = 11; age 36 ± 15 years; V̇O2max 52.4 ± 5.8 mL∙kg∙min-1 ) performed two tests 2-4 days apart, consisting of three incremental ramps (20 W∙min-1 ) to exhaustion interspersed with 2-min recoveries...
June 28, 2018: International Journal of Sports Physiology and Performance
Mehrez Hammami, Nawel Gaamouri, Gaith Aloui, Roy J Shephard, Mohamed Souhaiel Chelly
PURPOSE: This study analyzed the effects of complex strength training on the explosive muscular performance of junior female handball players. METHODS: Subjects were arbitrarily divided between an experimental group (n=14) and a control group (n=14). Training sessions and matches were performed together, but during the 10-week intervention, the experimental group replaced a part of the regular regimen by complex strength training. Measures assessed in both groups before and after the intervention included: running times over 5, 10, 20 and 30 m , change of direction tests [T-half agility test and modified Illinois test], repeated shuttle sprint ability and repeated changes of direction tests, jumping [squat, counter-movement, counter-movement with aimed arms and five-jump tests], static and dynamic balance, back extensor strength and 1RM half-squat...
June 28, 2018: International Journal of Sports Physiology and Performance
David R Hooper, William J Kraemer, Rebecca L Stearns, Brian R Kupchak, Brittanie M Volk, William H DuPont, Carl M Maresh, Doug J Casa
PURPOSE: Prior research has illustrated that high volumes of aerobic exercise result in a reduction in basal concentrations of testosterone in men. These prior studies have mostly been conducted on recreational runners and identified reduced testosterone, but not concentrations low enough to be considered pathological. Therefore, the purpose of this study is to assess the basal concentrations of testosterone and cortisol in elite triathletes, as well as assess the impact of a World Championship race on the acute responses of these hormones...
June 28, 2018: International Journal of Sports Physiology and Performance
Patrick Ward, Aaron J Coutts, Ricard Pruna, Alan McCall
There is a common expression in sports, that there is no 'i' in team. However, there is also a very important 'i' in sports teams - the individual athlete/player. Each player has his/her own unique characteristics including physical, physiological and psychological traits. Due to these unique characteristics, each player requires individual provision - whether it be an injury risk profile and targeted prevention strategy or treatment/rehabilitation for injury, dietary regimen, recovery or psychological intervention...
June 28, 2018: International Journal of Sports Physiology and Performance
Andrew J Carnes, Sara E Mahoney
PURPOSE: This study longitudinally compared changes in running performance (5-km TT) and fitness (VO2 max, body composition) between polarized training and CrossFit Endurance© in recreational runners. METHODS: Participants (N=21) completed 12 weeks of CrossFit Endurance (CFE) or polarized endurance training (POL). Both groups trained 5 d·wk-1 . POL ran 5 d·wk-1 while CFE ran 3 d·wk-1 and performed CrossFit© 3 d·wk-1 (run + CF 1 d·wk-1 ). Intensity was classified as low, moderate, or high (Zone 1, 2, or 3) according to ventilatory thresholds...
June 28, 2018: International Journal of Sports Physiology and Performance
Emma C Neupert, Stewart T Cotterill, Simon A Jobson
PURPOSE: Poor athlete buy-in and adherence to training monitoring systems (TMS) can be problematic in elite sport. This is a significant issue, as failure to record, interpret, and respond appropriately to negative changes in athlete wellbeing and training status may result in undesirable consequences, such as maladaptation and/or underperformance. This study examined the perceptions of elite athletes to their TMS, and their primary reasons for non-completion. METHODS: Nine national team sprint athletes participated in semi-structured interviews on their perceptions of their TMS...
June 28, 2018: International Journal of Sports Physiology and Performance
Bruno Marrier, Yann Le Meur, Cédric Leduc, Julien Piscione, Mathieu Lacome, Germain Igarza, Christophe Hausswirth, Jean-Benoît Morin, Julien Robineau
PURPOSE: To describe the training periodization in Rugby-7s players competing in the Sevens World Series during a non-Olympic season. METHODS: Workload data were collected over a 33-week period in twelve male players participating in a full competitive season. Workload was quantified using session RPE and GPS-derived data during training and competition. Self-reported wellbeing was assessed using a questionnaire. Each variable was analysed weekly and through 5 mesocycles (Pre-season, In-season 1-4), each of which ended with competition blocks...
June 28, 2018: International Journal of Sports Physiology and Performance
Israel Halperin
Despite the progress made by the scientific exercise community in collaborating and communicating with nonscientist coaches, there is room for improvement. Coaches find research difficult to understand, feel that their interests are not being addressed by exercise research, and rely on peer discussion to further their coaching knowledge base while consuming few peer-reviewed articles. One useful strategy to bridge the science-practice gap is with case studies. In addition to furthering our understanding of the physiology, psychology, and training schedules of elite athletes, case studies can serve (1) as a useful communication channel with coaches if presented as narratives and (2) to establish and strengthen relationships between scientists and coaches, leading to fruitful research collaborations...
June 21, 2018: International Journal of Sports Physiology and Performance
Stephen S Cheung
No abstract text is available yet for this article.
June 14, 2018: International Journal of Sports Physiology and Performance
Callum J McCaskie, Warren B Young, Brendan B Fahrner, Marc Sim
PURPOSE: To examine the association between pre-season training variables and subsequent in-season performance in an elite Australian football team. METHODS: Data from forty-one elite male Australian footballers (mean±SD: age=23.4±3.1y; height=188.4±7.1cm; mass=86.7±7.9kg) was collected from one Australian Football League (AFL) club. Pre-season training data (external load, internal load, fitness testing and session participation) were collected across the 17-week pre-season phase (6-weeks pre-Christmas, 11-weeks post-Christmas)...
June 12, 2018: International Journal of Sports Physiology and Performance
Harry E Routledge, Jill J Leckey, Matt J Lee, Andrew Garnham, Stuart Graham, Darren Burgess, Louise M Burke, Robert M Erskine, Graeme L Close, James P Morton
PURPOSE: To better understand the carbohydrate (CHO) requirement of Australian Football (AF) match play by quantifying muscle glycogen utilisation during an in-season AF match. METHODS: After a 24 h CHO loading protocol of 8 g/kg and 2 g/kg in the pre-match meal, two elite male forward players had biopsies sampled from m. vastus lateralis before and after participation in a South Australian Football League game. Player A (87.2kg) consumed water only during match play whereas player B (87...
June 12, 2018: International Journal of Sports Physiology and Performance
Haresh T Suppiah, Low Chee Yong, Gabriel Choong, Michael Chia
PURPOSE: The purpose of the research was to investigate the sport-specific performance effect of a brief afternoon nap on high-level Asian adolescent student-athletes that were habitually short sleepers. METHODS: In the studies, participants were randomly assigned to a nap or non-nap (reading) condition. In the first study, 12 male shooters (13.8 ± 1.0 yrs) performed a shooting assessment (20 competition shots) with heart rate variability monitored during the assessment...
June 12, 2018: International Journal of Sports Physiology and Performance
Benjamin G Serpell, Joshua Strahorn, Carmen Colomer, Andrew McKune, Christian Cook, Kate Pumpa
OBJECTIVE: This study examined the effect of a physical treatment (speed, power and strength training) and psychosocial treatment (group motivational presentation) on salivary testosterone (sal-T), salivary cortisol (sal-C), and sal-T to sal-C ratio (T:C) in professional rugby. METHODS: Fourteen male rugby players aged 25.9 ± 2.5 years, height 186.1 ± 6.7 cm, and body mass 104.1 ± 12.7 kg participated in this study. Testing occurred across two days on two separate occasions (week one and week two)...
June 12, 2018: International Journal of Sports Physiology and Performance
Herbert Wagner, Patrick Fuchs, Andrea Fusco, Philip Fuchs, W Jeffrey Bell, Serge P Duvillard
PURPOSE: Biological differences between men and women are well known; however, literature-addressing knowledge about the influence of sex to specific and general performance in team handball is almost nonexistent. Consequently, the aim of the study was to assess and compare specific and general physical performance in male and female elite team handball players, to determine if the differences are consequential for general compared to specific physical performance characteristics and the relationship between general and specific physical performance...
June 12, 2018: International Journal of Sports Physiology and Performance
Matthew A Wyon, Roger Wolman, Nicolas Kolokythas, Karen Sheriff, Shaun Galloway, Adam Mattiussi
PURPOSE: A number of studies have noted low levels of Vitamin D in dancers and this has been associated with increased risk of injuries and decreased muscular strength indices. The aim of the present study was to examine whether vitamin D supplementation over a 4-month period can improve muscle function and injury incidence. METHODS: Eighty-four participants volunteered, exclusion criteria and drop out (19%) reduced cohort to 67 (f=29, m=38; 17-19yrs). Participants were randomly assigned to either an intervention or placebo group (2:1 ratio)...
June 12, 2018: International Journal of Sports Physiology and Performance
Michael E Hales, John D Johnson
PURPOSE: The study investigated different sport field properties influence on muscular recruitment patterns and metabolic response during a series of running and agility drills. METHODS: Eleven male athletes were fitted with a standard multi-purpose training shoe. The test protocol consisting of four high-intensity trials with 60 seconds rest between trials performed on two fields with different properties. Time-dependent field properties were recorded using ASTM protocol (F-1936)...
June 12, 2018: International Journal of Sports Physiology and Performance
Alejandro Javaloyes, Jose Manuel Sarabia, Robert Patrick Lamberts, Manuel Moya-Ramon
PURPOSE: Road cycling is a sport with extreme physiological demands. Therefore, there is a need to find new strategies to improve performance. Heart rate variability (HRV) has been suggested as an effective alternative for prescribing training load against predefined training programs. The purpose of this study is to examine the effect of training prescription based on HRV in road cycling performance. METHODS: Seventeen well-trained cyclists participated in this study...
May 29, 2018: International Journal of Sports Physiology and Performance
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