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
Asymmetry of lower limb strength and jumping ability of young soccer players.
TL;DR: The asymmetry of the muscle torque of the flexors and extensors of the knee joint does not correlate with the results of both jumping ability tests and there was a statistically significant correlation between the vGRF asymmetry index during take-off and the height of the VJ.
Journal ArticleDOI
Effects of rehydration on the physical and technical condition in soccer players
TL;DR: The dehydration achieved and the rate of sweating was greater when the players drank freely at will against a recommended rehydration (1.3 ± .8% vs. 0.6%, p = .01) and the maximum vertical jump height and accuracy were measured in each session.
Journal ArticleDOI
Kinematic Mobile Drop Jump Analysis at Different Heights Based on a Smartphone Inertial Sensor
Alvaro Mateos-Angulo,Alejandro Galán-Mercant,Alejandro Galán-Mercant,Antonio Cuesta-Vargas,Antonio Cuesta-Vargas +4 more
TL;DR: The built-in iPhone 4S® inertial sensor is able to measure acceleration for healthy young adults performing a vertical drop jump test and the acceleration kinematic variables are higher in the dropJump test from 60 cm than from 30 cm.
Journal ArticleDOI
Warm-up stretching exercises and physical performance of youth soccer players
Jordan Hernández-Martínez,R. Ramirez-Campillo,Tiago Vera-Assaoka,M T Castillo-Cerda,Bastian Carter-Thuillier,Tomás Herrera-Valenzuela,Antonio López-Fuenzalida,Hadi Nobari,Pablo Valdés-Badilla +8 more
TL;DR: In this paper , the authors compared the effects of standard warmup versus warm-up using stretching exercises on the physical performance of male youth soccer players and found that no significant differences were found between warmup conditions compared to CC in CMJ, sprint speed, and ball kicking speed.
Journal ArticleDOI
Power of lower extremities and age were the main determinants on the agility test for adults in a cohort of men aged 66-91 years
Sirpa Manderoos,Sirpa Manderoos,Niko Wasenius,Merja K. Laine,Urho M. Kujala,Esko Mälkiä,Jaakko Kaprio,Seppo Sarna,Heli M. Bäckmand,Jyrki Kettunen,Sirkka Aunola,Johan G. Eriksson +11 more
TL;DR: Power of lower extremities and age were the main determinants of the results of ATA in a cohort of men aged 66–91 years and from a clinical point of view, power ofLower extremities measured by test demanding explosive power plays an important role to maintain or enhance capacity of agility.
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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