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Nuria Garatachea, Zoraida Verde, Alejandro Santos-Lozano, Thomas Yvert, Gabriel Rodriguez-Romo, Francisco J. Sarasa, Sonsoles Hernández-Sánchez, Catalina Santiago and Alejandro Lucia

Purpose:

To determine the association of the ACTN3 R577X polymorphism with leg-muscle explosive power in Spanish (white) elite basketball players and controls.

Participants:

100 (60 men) elite basketball players (cases) and 283 nonathletic controls.

Methods:

The authors assessed power performance by means of the vertical-squat and countermovement-jump tests.

Results:

Genotype distributions did not differ between groups (cases: 37.0% [RR], 42.0% [RX], and 21.0% [XX]; controls: 31.8% [RR], 49.8% [RX], and 18.4% [XX]; P = .353). The authors did not observe any effect of the ACTN3 R577X polymorphism on study phenotypes in either group, including when they performed the analyses separately in men and women. They found no association between the ACTN3 R577X polymorphism and the likelihood of being an elite basketball player using the dominant or the recessive model, and the results remained unaltered when the analyses were adjusted for sex, weight, height, and age or when performed for men and women separately.

Conclusions:

Although the ACTN3 R577X is associated with explosive muscle performance and this phenotype is important in the sport of basketball (ie, during jumps), the authors found no association with leg explosive power in elite basket players or with the status of being this type of athlete.

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Thomas Haugen, Gøran Paulsen, Stephen Seiler and Øyvind Sandbakk

external power output underlie successful performance in sports. Accordingly, regular assessment of aerobic and anaerobic power informs the overall training strategy of most of today’s elite athletes. Numerous groups have reported contemporary power data from elite athletes, particularly runners, cyclists

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Jason D. Stone, Adam C. King, Shiho Goto, John D. Mata, Joseph Hannon, James C. Garrison, James Bothwell, Andrew R. Jagim, Margaret T. Jones and Jonathan M. Oliver

), elicits a near linear decline in barbell velocity, and thus power output. 3 – 5 Recognizing that force and velocity are both required to maintain a given work capacity, muscular fatigue has been defined as the inability to maintain the required or expected power output. 6 Attenuated power production is

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Hermann Zbinden-Foncea, Isabel Rada, Jesus Gomez, Marco Kokaly, Trent Stellingwerff, Louise Deldicque and Luis Peñailillo

exertion, which suggests that caffeine ameliorates the discomfort produced by fatigue and enhances motor-unit recruitment. 13 When a high power output is required and during repeated-sprint events, the ergogenic effects are less consistent 12 ; several explanations may be put forward, such as variability

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Emma K. Zadow, Cecilia M. Kitic, Sam S.X. Wu and James W. Fell

Advancements in the technology of cycling ergometers have been shown to provide increasing accuracy in the measurement of power output. The measurement of power is an important determinant of performance and is vital for evaluating individual differences in performances, monitoring the

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Seiichiro Takei, Kuniaki Hirayama and Junichi Okada

Olympic weight-lifting exercises are among the most powerful movements in sport and are often used by athletes for power enhancement along with other primary power exercises like plyometrics and jump squats. 1 Among weight-lifting exercises, the hang power clean (HPC) is a widely used exercise in

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Jonathon Weakley, Carlos Ramirez-Lopez, Shaun McLaren, Nick Dalton-Barron, Dan Weaving, Ben Jones, Kevin Till and Harry Banyard

%) have been demonstrated to promote greater hypertrophic adaptations due to the increased training volume that can be achieved prior to set termination. 4 Alternatively, smaller thresholds (eg, 10% vs 30%) encourage greater development of strength and power due to reduced neuromuscular fatigue and

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Jake Schuster, Dan Howells, Julien Robineau, Anthony Couderc, Alex Natera, Nick Lumley, Tim J. Gabbett and Nick Winkelman

allow for effective development and application of running skills and capacities, strength and power, injury prevention, aerobic and anaerobic conditioning, and tactical/technical components. The primary responsibility of physical-preparation programs is to ensure that players spend as much time as

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Matthew A. Wyon, Roger Wolman, Nicolas Kolokythas, Karen Sheriff, Shaun Galloway and Adam Mattiussi

48%). 6 Low serum 25(OH)D has been linked to reduced muscle strength and power which are fundamental to athletic performance 6 , 7 ; this has further been associated with an increased incidence of injury. 8 , 9 Vitamin D supplementation has become recommended practice in a number of sports including

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Jennifer Sygo, Alicia Kendig Glass, Sophie C. Killer and Trent Stellingwerff

multiple track events, including sprints, hurdles, and middle-distance events. Unlike track events, which rely on a single timed race to determine outcomes, field event athletes must translate speed (forward or rotational) and power into the farthest or highest jump or throw, with the best outcome over