Sex Differences in Mechanisms of Recovery after Isometric and Dynamic Fatiguing Tasks

Medicine and Science in Sports and Exercise
Jonathon W SenefeldSandra K Hunter

Abstract

The purpose of this study was to determine whether supraspinal mechanisms contribute to the sex difference in fatigability during and recovery from a dynamic and isometric fatiguing task with the knee extensors. Transcranial magnetic stimulation and electrical stimulation were used to determine voluntary activation and contractile properties of the knee extensors in 14 men and 17 women (20.8 ± 1.9 yr) after a 1) 60-s sustained, maximal voluntary isometric contraction (MVIC), and 2) dynamic fatiguing task involving 120 maximal voluntary concentric contractions with a 20% MVIC load. There were no differences between men and women in the reduction of maximal torque during the sustained MVIC (54.4% ± 18.9% vs 55.9% ± 11.2%, P = 0.49) or in the decrease in power during the dynamic fatiguing task (14.7% ± 20.1% vs 14.2% ± 18.5%, P = 0.92). However, MVIC torque recovered more quickly for women than men after the sustained MVIC and the dynamic task (P < 0.05). The transcranial magnetic stimulation-elicited superimposed twitch was larger for men than for women during the sustained MVIC and in recovery (immediately post, R0.1: 4.7% ± 3.3% vs 2.4% ± 1.9% MVIC; P = 0.02), with no sex difference after the dynamic task (P = 0.35). The reduct...Continue Reading

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Citations

Mar 30, 2018·Journal of Applied Physiology·Jonathon SenefeldSandra K Hunter
Mar 2, 2018·European Journal of Sport Science·Gennaro BocciaAlberto Rainoldi
Jan 4, 2019·Journal of Applied Physiology·Jonathon W SenefeldSandra K Hunter
Sep 19, 2019·The Journal of Physiology·Paul AnsdellStuart Goodall
Jul 26, 2019·Medicine and Science in Sports and Exercise·Paul W MarshallRoger M Enoka
Jul 8, 2020·Physiological Reports·Jonathon W SenefeldSandra K Hunter
Sep 5, 2020·Experimental Physiology·Goncalo V MendoncaCarolina Vila-Chã
Sep 2, 2020·Clinical Physiology and Functional Imaging·Vickie WongJeremy P Loenneke
Apr 16, 2021·Scientific Reports·Miguel GomesGoncalo V Mendonca
Dec 21, 2019·Journal of Strength and Conditioning Research·Joshua L KellerGlen O Johnson

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