Sex differences in neuromuscular fatigability in response to load carriage in the field in British Army recruits

Journal of Science and Medicine in Sport
Thomas J O'LearyRachel M Izard

Abstract

Women are resistant to neuromuscular fatigue compared to men in response to a range of exercise tasks. The sex differences in the neuromuscular responses to load carriage have yet to be investigated. Prospective cohort study. Twenty-three male and 19 female British Army recruits completed a 9.7km loaded march within 90min, with the weight carried dependent on military trade (16±2kg for men and 15±1kg for women). Isometric maximal voluntary contraction (MVC) force of the knee extensors and vertical jump (VJ) height were examined pre- and post-loaded march to examine neuromuscular fatigue. Heart rate (HR) was recorded throughout and ratings of perceived exertion (RPE) was recorded following the march. HR was higher for women (173±9bmin-1, 83±6% heart rate reserve) than men (158±8bmin-1, 72±6% heart rate reserve) (p≤0.001). RPE following the march was also higher for women than men (6±2 vs 4±2, respectively, p<0.001). The loss in MVC force was greater for men than women (-12±9% vs -9±13%, respectively, p=0.031), however VJ height was impaired to a similar extent (-5±11% vs -5±6%, respectively, p=0.582). The greater physiological stress during load carriage for women compared to men did not translate to a greater severity of knee e...Continue Reading

Citations

Jul 27, 2018·Medicine and Science in Sports and Exercise·Thomas J O'LearyRachel M Izard
Feb 27, 2020·Medicine and Science in Sports and Exercise·Jodie A WillsTim L A Doyle
Dec 12, 2019·Journal of the International Society of Sports Nutrition·Shaun ChapmanRachel Izard
Oct 21, 2020·Advances in Nutrition·Katrina L HindeSophie L Wardle
Jan 28, 2021·Sports Medicine·Nicholas B TillerGuillaume Y Millet
Nov 11, 2020·International Journal of Environmental Research and Public Health·Álvaro González FernándezCarlos Barrios
Feb 27, 2021·Current Osteoporosis Reports·Thomas J O'LearyJulie P Greeves
Apr 16, 2021·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·Thomas J O'LearyJulie P Greeves

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