The effect of increasing trunk flexion during normal walking.

Gait & Posture
Stephen J Preece, Wael Alghamdi

Abstract

The head, arms and trunk segment constitute a large proportion of the body's mass. Therefore, small alterations in trunk inclination may affect lower limb joint moments and muscle activation patterns. Although previous research has investigated the effect of changing frontal plane inclination of the trunk, it is not clear how increasing trunk flexion will impact on the activation of the lower limb muscles. What is the effect of independently manipulating trunk flexion angle on lower limb kinematics, moments and muscle function? Gait analysis was carried out on 20 healthy people under four trunk flexion conditions: normal walking (NW), NW-5°, NW+5° and NW+10°. For the latter three conditions, a biofeedback approach was used to tightly control trunk flexion angle. A linear mixed model was used to investigate the effect of changing trunk flexion on joint angles, moments, and knee muscle activation. There were clear increases in hip and ankle moments as trunk flexion was increased, but no change in knee moments. The results also showed a linear increase in knee flexor muscle activity and a corresponding increase in co-contraction as trunk flexion increased. Interestingly, there was a dramatic change in the profile of hamstring acti...Continue Reading

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May 27, 2020·Human Movement Science·Wael Alghamdi, Stephen J Preece

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Citations

Jun 10, 2021·BMC Musculoskeletal Disorders·Stephen J PreeceNicola E Walsh

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