Journal ArticleDOI
A simple method for measurement of mechanical power in jumping.
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TLDR
The new jumping test seems suitable to evaluate the power output of leg extensor muscles during natural motion because of its high reproducibility and simplicity, and is suitable for laboratory and field conditions.Abstract:
A simple test for the measurement of mechanical power during a vertical rebound jump series has been devised. The test consists of measuring the flight time with a digital timer (+/- 0.001 s) and counting the number of jumps performed during a certain period of time (e.g., 15-60 s). Formulae for calculation of mechanical power from the measured parameters were derived. The relationship between this mechanical power and a modification of the Wingate test (r = 0.87, n = 12 males) and 60 m dash (r = 0.84, n = 12 males) were very close. The mechanical power in a 60 s jumping test demonstrated higher values (20 W X kgBW-1) than the power in a modified (60 s) Wingate test (7 W X kgBW-1) and a Margaria test (14 W X kgBW-1). The estimated powers demonstrated different values because both bicycle riding and the Margaria test reflect primarily chemo-mechanical conversion during muscle contraction, whereas in the jumping test elastic energy is also utilized. Therefore the new jumping test seems suitable to evaluate the power output of leg extensor muscles during natural motion. Because of its high reproducibility (r = 0.95) and simplicity, the test is suitable for laboratory and field conditions.read more
Citations
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Journal ArticleDOI
Creatine supplementation and sprint performance in soccer players
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Journal ArticleDOI
Regular participation in sports is associated with enhanced physical fitness and lower fat mass in prepubertal boys
Ignacio Ara,Germán Vicente-Rodríguez,J Jimenez-Ramirez,Cecilia Dorado,Jose A. Serrano-Sanchez,Jose A. L. Calbet +5 more
TL;DR: Regular participation in at least 3 h per week of sports activities and competitions on top of the compulsory physical education program is associated with increased physical fitness, lower whole body and trunkal fat mass in prepubertal boys.
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No Effect of Eccentric Training on Jumper's Knee in Volleyball Players During the Competitive Season: A Randomized Clinical Trial
TL;DR: There was no effect on knee function from a 12-week program with eccentric training among a group of volleyball players with patellar tendinopathy who continued to train and compete during the treatment period.
Journal ArticleDOI
Validity and Reliability of Methods for Testing Vertical Jumping Performance
TL;DR: The validity and reliability of the jumping ergometer method for evaluating performance in two-legged vertical countermovement and serial rebound jumps were investigated in this paper, where the internal segmental and nonvertical energy flow components for drop jumps were also studied.
Journal ArticleDOI
Influence of different relative intensities on power output during the hang power clean: identification of the optimal load.
Naoki Kawamori,Aaron J. Crum,Peter A. Blumert,Justin R. Kulik,James T. Childers,Julie A. Wood,Michael H. Stone,G. Gregory Haff +7 more
TL;DR: It was concluded that (a) the relative intensity had a significant influence on power output, and (b) power output can be maximized at a submaximal load during the hang power clean.
References
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Journal Article
Utilization of stored elastic energy in leg extensor muscles by men and women
Paavo V. Komi,C Bosco +1 more
TL;DR: The results suggest that although the leg extensor muscles of the men subjects could sustain much higher stretch loads, the females may be able to utilize a greater portion of the stored elastic energy in jumping activities.
Journal ArticleDOI
Biomechanical analysis of knee flexion and extension
TL;DR: For the knee, mathematical analyses for the sagittal plane were performed on data obtained from roentgenograms and a load cell incorporated in a specially constructed force table to find the axis of rotation for the knee displaced 3·2 cm through a 90° range.
Journal ArticleDOI
Storage of Elastic Energy in Skeletal Muscles in Man
TL;DR: It is suggested that the elastic energy is stored in the active muscles, and it is demonstrated that the muscles of the legs are activated in the downward jumps before contact with the platform is established.
Journal ArticleDOI
Measurement of muscular power (anaerobic) in man.
R. Margaria,P. Aghemo,E. Rovelli +2 more
Journal ArticleDOI
Combined effect of elastic energy and myoelectrical potentiation during stretch-shortening cycle exercise
TL;DR: The observed results emphasize that both elastic energy and reflex potentiation may operate effectively during stretch-shortening cycle activity.
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Utilization of stored elastic energy in leg extensor muscles by men and women
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