Peak Torque and Rate of Torque Development Influence on Repeated Maximal Exercise Performance: Contractile and Neural Contributions: e0119719

Rapid force production is critical to improve performance and prevent injuries. However, changes in rate of force/torque development caused by the repetition of maximal contractions have received little attention. The aim of this study was to determine the relative influence of rate of torque develo...

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Veröffentlicht in:PloS one 2015-04, Vol.10 (4)
Hauptverfasser: Morel, Baptiste, Rouffet, David M, Saboul, Damien, Rota, Samuel, Clemencon, Michel, Hautier, Christophe A
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Rouffet, David M
Saboul, Damien
Rota, Samuel
Clemencon, Michel
Hautier, Christophe A
description Rapid force production is critical to improve performance and prevent injuries. However, changes in rate of force/torque development caused by the repetition of maximal contractions have received little attention. The aim of this study was to determine the relative influence of rate of torque development (RTD) and peak torque (Tpeak) on the overall performance (i.e. mean torque, Tmean) decrease during repeated maximal contractions and to investigate the contribution of contractile and neural mechanisms to the alteration of the various mechanical variables. Eleven well-trained men performed 20 sets of 6-s isokinetic maximal knee extensions at 240 degree .s-1, beginning every 30 seconds. RTD, Tpeak and Tmean as well as the Rate of EMG Rise (RER), peak EMG (EMGpeak) and mean EMG (EMGmean) of the vastus lateralis were monitored for each contraction. A wavelet transform was also performed on raw EMG signal for instant mean frequency (ifmean) calculation. A neuromuscular testing procedure was carried out before and immediately after the fatiguing protocol including evoked RTD (eRTD) and maximal evoked torque (eTpeak) induced by high frequency doublet (100 Hz). Tmean decrease was correlated to RTD and Tpeak decrease (R super(2)=0.62; p
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A neuromuscular testing procedure was carried out before and immediately after the fatiguing protocol including evoked RTD (eRTD) and maximal evoked torque (eTpeak) induced by high frequency doublet (100 Hz). Tmean decrease was correlated to RTD and Tpeak decrease (R super(2)=0.62; p&lt;0.001; respectively beta =0.62 and beta =0.19). RER, eRTD and initial ifmean (0-225 ms) decreased after 20 sets (respectively -21.1 plus or minus 14.1, -25 plus or minus 13%, and ~20%). RTD decrease was correlated to RER decrease (R super(2)=0.36; p&lt;0.05). The eTpeak decreased significantly after 20 sets (24 plus or minus 5%; p&lt;0.05) contrary to EMGpeak (-3.2 plus or minus 19.5 %; p=0.71). Our results show that reductions of RTD explained part of the alterations of the overall performance during repeated moderate velocity maximal exercise. 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title Peak Torque and Rate of Torque Development Influence on Repeated Maximal Exercise Performance: Contractile and Neural Contributions: e0119719
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