Flexibility in Joint Coordination Remains Unaffected by Force and Balance Demands in Young and Old Adults During Simple Sit-to-stand Tasks

Overview

Journal Eur J Appl Physiol

Specialty Physiology

Date 2018 Nov 27

PMID 30474739

Citations 2

Authors

Christian Greve

Tibor Hortobagyi

Raoul M Bongers

Affiliations

Soon will be listed here.

Abstract

Purpose: We examined the possibility that old adults use flexibility in joint coordination as a compensatory mechanism for the age-related decline in muscle strength when performing the sit-to-stand (STS) task repeatedly under high force and balance demands.

Method: Young (n = 14, 22.4 ± 2.1) and old (n = 12, 70 ± 3.2) healthy adults performed repeated STSs under high and low force and balance demands. The balance demand was manipulated by reducing the base of support and the force demand by increasing body weight with a weight vest. Uncontrolled manifold analysis was used to quantify age differences in motor flexibility.

Results: While there were age-typical differences in kinematic STS strategies, flexibility in joint coordination was independent of age and task difficulty during repeated STSs.

Discussion: That simple manipulations of force and balance demands did not affect flexibility in joint coordination in old and young adults suggests that motor flexibility acts as a compensatory mechanism only at the limits of available muscle strength and balance abilities during STS movements. Intervention studies should identify how changes in specific neuromuscular functions affect flexibility in joint coordination during activities of daily living such as STS.

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