Journal ArticleDOI
A simple method for measurement of mechanical power in jumping.
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
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Dissertation
Análisis de los efectos agudos de la competición en judo
TL;DR: In this article, the authors evaluate the performance of the judo in terms of its performance in the sport of combate de judo and its relationship with variables fisiologicas and metabolicas.
Journal ArticleDOI
Validez comparativa y fiabilidad de dos métodos para la valoración de la fuerza de salto vertical.
TL;DR: Aixi et al. as mentioned in this paper found that the fiabilitat de Dma (r=0,97; coeficiente de variacion=5%) va ser superior to the Dcg max (31 ± 8 cm).
Journal ArticleDOI
Examination of relationship between 30 second wingate test performance and spirometric respiratory functions in young adults
TL;DR: In this work, the tested spirometric respiratory functions have got an active role in the WT power parameters and it has been confirmed that there is a positive tendency.
Book ChapterDOI
Wireless MEMS for wearable sensor networks
TL;DR: In this paper, the authors introduce hardware and software development of wearable MEMS solutions that provide advanced sensing, processing, and communication capabilities, with limited power consumption and adequate ergonomic characteristics.
ORIGINALARBEIT/ORIGINAL PAPER Diagnostic of footwork characteristics and running speed demands in tennis on different ground surfaces
TL;DR: In this article, the authors performed a tennis specific baseline shuttle run test including one change of direction (SR) either on clay or on an indoor carpet court, and participants completed a linear sprint test, a counter movement jump (CMJ), and a drop jump (DJ).
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
Paavo V. Komi,C Bosco +1 more