Influence of maximum-graded exercise test on maximal plantarflexion and dorsiflexion torque production in the seated and supine positions

Document Type

Article

Publication Date

1-1-2020

Abstract

BACKGROUND: There have been multiple studies focusing on the relationship between ankle muscle torque and fatigue with different body positions but have found conflicting results. OBJECTIVE: We investigated the effect of body position on maximum voluntary isometric contractions (MVIC) of ankle plantarflexors (PF) and dorsiflexors (DF) in the pre and post-fatigued conditions in healthy adults. METHODS: Twenty-five participants ran on a treadmill until volitional exhaustion by performing the Bruce protocol. The participants then performed three MVICs for both PF and DF before and after volitional exhaustion. RESULTS: Peak torques of PF (p< 0.01) and DF (p< 0.01) in the pre-fatigue condition were greater than in the post-fatigue condition regardless of the body position. Peak torques of PF (p< 0.01) and DF (p= 0.03) in the seated position were greater than in the supine position regardless of time. Variances of peak torque differences were not significantly different between the pre and post-fatigue conditions for the seated and supine positions (p= 0.09). CONCLUSIONS: The results of this study suggest that the body position affects ankle PF and DF torques but does not influence the magnitude of PF and DF strength declines elicited by a fatiguing protocol. Therefore, to obtain the most reliable MVIC measurements, the body position during MVICs should be consistent.

Publication Title

Isokinetics and Exercise Science

First Page Number

153

Last Page Number

159

DOI

10.3233/IES-183198

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