Influence of hip external rotation on hip adductor and rectus femoris myoelectric activity during a dynamic parallel squat

Journal of Strength and Conditioning Research
Glauber Ribeiro PereiraLuiz Alberto Batista

Abstract

This study sought to compare the myoelectric activity of the hip adductors (HAs) and rectus femoris (RF) when the hip was in a neutral position or externally rotated by 30° or 50° (H0, H30, and H50, respectively) during a parallel squat. Ten healthy subjects performed 10 repetitions of squats in each of the 3 hip positions and the myoelectric activities of the HAs and RF were recorded. The signal was then divided into categories representing concentric (C) and eccentric (E) contractions in the following ranges of motion: 0-30° (C1 and E1), 30-60° (C2 and E2), and 60-90° (C3 and E3) of knee flexion. From those signals, an root mean square (RMS) value for each range of motion in each hip position was obtained. All values were normalized to those obtained during maximum voluntary isometric contraction. We found that HAs showed a significant increase in myoelectric activity during C3 and E3 in the H30 and H50 positions, as compared with H0. Meanwhile, RF activity did not significantly differ between hip positions. Both muscles showed higher activation during 60-90° (C3 and E3) of knee flexion, as compared with 0-30° (C1 and E1) and 30-60° (C2 and E2). The results suggest that if the aim is to increase HA activity despite the low pe...Continue Reading

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Citations

Mar 1, 2012·Journal of Strength and Conditioning Research·Dave R ClarkAngus M Hunter
Apr 17, 2012·Journal of Strength and Conditioning Research·Paul A SwintonArthur D Stewart
Dec 14, 2011·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Thomas G Balshaw, Angus M Hunter
Jun 2, 2017·Journal of Strength and Conditioning Research·Daniel J GlassbrookAdam G Storey
Oct 27, 2017·Journal of Strength and Conditioning Research·Alexandre C BarbosaEdgar R Vieira
Jan 23, 2021·International Journal of Environmental Research and Public Health·Giuseppe CoratellaEmiliano Cè
Jan 28, 2017·Journal of Strength and Conditioning Research·Wallace MachadoHumberto Miranda
Jun 26, 2021·Frontiers in Sports and Active Living·Stian LarsenRoland van den Tillaar

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