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Aging Clin Exp Res. 2017 Dec;29(6):1211-1219. doi: 10.1007/s40520-016-0702-7. Epub 2017 Feb 25.

The role of thigh muscular efforts in limiting sit-to-stand capacity in healthy young and older adults.

Author information

1
School of Human Kinetics, University of Ottawa, Ottawa, Canada. bryanton@ualberta.ca.
2
Aging and Movement Laboratory, Bruyère Research Institute, Ottawa, Canada. bryanton@ualberta.ca.
3
School of Rehabilitation Sciences, University of Ottawa, Ottawa, Canada.
4
Aging and Movement Laboratory, Bruyère Research Institute, Ottawa, Canada.

Abstract

Aging is associated with an unavoidable decline in muscle mass, known as sarcopenia, leading to neuromuscular declines, muscle weakness, and subsequent disability. One particular measure utilized by rehabilitative professionals in evaluating functional declines in older persons is sit-to-stand (STS) capacity. The purpose of this investigation was to determine the role of activation intensity requirements of the thigh musculature in limiting a multi-joint STS endurance task. To do so, surface EMG signals of the quadriceps femoris (QF) and hamstrings (biceps femoris; BF) and their co-activation ratios (H:Q) were collected in young (18-35 years; n = 12) and older (60-75 years; n = 12) adult participants who repeatedly stood from a seated position until exhaustion. QF %MVIC was the sole predictor of total STS task times, as those who required the highest quadriceps efforts had the shortest task times. Moreover, older adult participants had significantly higher starting QF %MVIC as well as shorter task times. Interestingly, the H:Q ratio was not a significant predictor of STS capacities, nor did it differ between age groups or with fatigue. Results indicate that strengthening of the quadriceps to elevate or maintain strength reserves may improve an older adult's ability to perform multi-joint tasks repetitively throughout the day.

KEYWORDS:

Aging; Co-contraction; Hamstrings; Muscle endurance; Quadriceps; Sit-to-stand

PMID:
28238153
DOI:
10.1007/s40520-016-0702-7
[Indexed for MEDLINE]

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