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Times for Peaks of Stress in Quadriceps Muscles During the Force-Velocity Test
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Edité par CCSD ; Biomedical Research Network -
International audience. Purpose: The aim of this study was to examine the surface Electromyogram (EMG) power spectral during an intermittent test with increasing intensity.Methods: Eighteen sedentary participants (age, 25 ± 4 years; height, 181 ± 3 cm, and weight, 77 ± 7 kg) completed two tests each: a maximum test to determine their physical fitness and a Force-Velocity test (FVt) to examine the EMG evolution of three superficial quadriceps muscles [anterior (RA), Vastus Lateralis (VL), Vastus Medialis (VM)] at each sprint.Results: The increases of the root-mean-square (RMS in arbitrary unit) and mean power frequency (MPF in HZ) of EMG signal were observed for all sprints in RA, VL, and VM. Rapids increase of RMS and MPF up to 4-5th seconds and a plateau or decline towards the 6th second were observed. While for RMS these increases were similar and larger for RF and VL compared to that of VM, for MPF, the result was opposite. We showed early and great implication of RF and VL during rapids actions as sprints on bicycle with slow and low contribution of VM important to the maintenance of effort. It would be important to advise a particular training of the RF and the VL in the cyclists to improve the speed of reaction and, of the VM for the maintenance of this speed.Conclusion: We observed similar times for peaks of stress in surface quadriceps muscles at all sprints despite the increase of power output.
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