Bilateral deficit in strength but not rapid force during maximal handgrip contractions

The purpose of this experiment was to evaluate the bilateral index in force and electromyographic (EMG) responses for the dominant and non-dominant hands during maximal handgrip contractions in males and females. Thirty-two right-handed participants (16 females) performed maximal unilateral and bilateral handgrip contractions on two separate visits. Bilateral indices were computed for maximal force, rate of force development (RFD100), EMG amplitude, and the rate of EMG rise (RER). There was a bilateral deficit for maximal force in the dominant (-4.98 ± 7.39%, p < 0.001; d = 0.674) but not the non-dominant hand (-1.57 ± 9.10%, p = 0.334; d = 0.173). No deficits were observed for rapid force. The non-dominant flexor carpi radialis showed a bilateral facilitation in EMG amplitude (+12.32 ± 19.29%, p < 0.001; d = 0.638), yet a bilateral deficit for RER (-22.10 ± 27.80%, p < 0.001; d = 0.795). No sex differences were observed for any of the bilateral indices. These data suggest that maximal but not rapid force is susceptible to a bilateral deficit during contractions of the hands. The EMG responses did not parallel the force data. We show sex does not influence the magnitude or direction of the bilateral index in this muscle group. Highlights A bilateral deficit in strength is shown for the dominant, but not the non-dominant hand. There was no significant bilateral deficit in rapid force. The present findings show no evidence of sex-related differences in bilateral indices of force and EMG.
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Aiheet: käsi voima, vahvuus nopeusvoima lihassähkökäyrä naispuolinen miespuolinen toiminta lihas sukupuoli
Aihealueet: valmennusoppi voima ja nopeus urheilu
Tagging: Griffkraft
DOI: 10.1080/17461391.2020.1800104
Julkaisussa: European Journal of Sport Science
Julkaistu: 2021
Vuosikerta: 21
Numero: 6
Sivuja: 836-843
Julkaisutyypit: artikkeli
Kieli: englanti (kieli)
Taso: kehittynyt