Effects Of Age, Joint Angle, And Test Modality On Strength Production And Functional Outcomes

Keywords

explosive strength; mobility; neuromuscular; Rate of force development; sarcopenia

Abstract

This study investigated the impact of age, knee joint angle, and strength testing modality on lower body maximal and rapid strength production and assessed the transferability of these characteristics to mobility-related function. Twenty young (age=21.9 yrs) and eighteen elderly (71.1 yrs) adults performed single-joint and multiple-joint isometric maximal voluntary contractions at three knee angles. Outcome measures included peak torque (PT), rate of torque development (RTD), jump height, power, 10 and 400 m walk, and timed chair stand. Older adults exhibited greater reductions in RTD for the multiple-joint (45%) than for the single-joint mode (18%). The 10 m walk was best predicted by multiple-joint RTD at 90°, the 400 m walk by jump height, and the chair stand by single-joint PT at 20°. Single-joint strength tests may underestimate age-related rapid strength impairments, likely due to requirements to exert muscular force in excess of one's body mass in an upright position.

Publication Date

2-1-2018

Publication Title

International Journal of Sports Medicine

Volume

39

Issue

2

Number of Pages

124-132

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1055/s-0043-121149

Socpus ID

85034772177 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85034772177

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