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Erschienen in:
01.08.2014 | Original Article
Force–velocity relationship of leg extensors obtained from loaded and unloaded vertical jumps
Erschienen in: European Journal of Applied Physiology | Ausgabe 8/2014
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Purpose
Resent research has suggested that loaded multi-joint movements could reveal a linear force–velocity (F–V) relationship. The aim of the present study was to evaluate the F–V relationship both across different types of vertical jumps and across different F and V variables.
Methods
Ten healthy subjects performed maximum various vertical jumps that were either loaded or unloaded by constant external forces of up to 30 % of their body weight. Both the maximum and averaged F and V data were recorded.
Results
The observed F–V relationships proved to be strong (median correlation coefficients ranged 0.78–0.93) and quasi-linear. Their F- and V-intercepts and the calculated maximum power (P) were highly reliable (0.85 < ICC < 0.98), while their concurrent validity with respect to their directly measured values was on average moderate-to-large. The obtained F–V relationships also revealed that (1) the assessment of maximum F and P could be somewhat more reliable and valid than the assessment of maximum V, (2) natural countermovement jumps should be employed rather than the jumps performed from a fixed squat position, while (3) both maximum and averaged F and V variables could be used despite revealing markedly different regression parameters.
Conclusions
The data generally reveal a reliable, valid, strong and quasi-linear F–V relationship across variety of vertical jumps and the recorded F and V variables. Therefore, we conclude that the loaded vertical jumps could be developed into a routine method for testing the force, velocity, and power generating capacity of leg extensors.