Journal article
Isokinetic Dynamometry in Healthy Versus Sarcopenic and Malnourished Elderly: Beyond Simple Measurements of Muscle Strength
Journal of applied gerontology, Vol.36(6), pp.709-732
06/01/2017
DOI: 10.1177/0733464815584669
PMID: 25948290
Abstract
This study quantified systematic and intraindividual variability among three repetitions of concentric isokinetic knee extension and flexion tests to determine velocity-related differences in peak torque (PT) and mean power (MP) in healthy elderly (HE) versus sarcopenic and malnourished elderly (SME). In total, 107 HE (n = 54 men, n = 53 women) and 261 SME (n = 101 men, n = 160 women) performed three maximal concentric isokinetic knee extension and flexion repetitions at 60 degrees s(-1) and 180 degrees s(-1). PT for Repetition 3 was lower than Repetitions 1 and 2, while MP for Repetition 1 was lower than Repetitions 2 and 3 in SME. Intraindividual variability among repetitions was correlated with strength, but not age, and was greater in SME, during knee flexion, and at 180 degrees s(-1). Velocity-related decreases in PT from 60 degrees s(-1) to 180 degrees s(-1) were more pronounced in SME. In summary, (a) the repetition with the highest PT value may be the best indicator of maximal strength, while the average may indicate strength maintenance in SME; (b) intraindividual variability among repetitions reflects functional decrements from HE to SME; and (c) decreases in PT from 60 degrees s(-1) to 180 degrees s(-1) may reflect greater losses of fast-twitch (type II) fiber function.
Details
- Title: Subtitle
- Isokinetic Dynamometry in Healthy Versus Sarcopenic and Malnourished Elderly: Beyond Simple Measurements of Muscle Strength
- Creators
- Joel T. Cramer - University of Nebraska–LincolnNathaniel D. M. Jenkins - University of Nebraska–LincolnVikkie A. Mustad - 2Abbott Nutrition, Columbus, OH, USAJoseph P. Weir - University of Kansas
- Resource Type
- Journal article
- Publication Details
- Journal of applied gerontology, Vol.36(6), pp.709-732
- DOI
- 10.1177/0733464815584669
- PMID
- 25948290
- NLM abbreviation
- J Appl Gerontol
- ISSN
- 0733-4648
- eISSN
- 1552-4523
- Publisher
- Sage
- Number of pages
- 24
- Grant note
- Abbott Nutrition; Abbott Laboratories NEB-36-078 / University of Nebraska Agricultural Research Division through the Hatch Act (Agency: U.S. Department of Agriculture, National Institute of Food and Agriculture)
- Language
- English
- Date published
- 06/01/2017
- Academic Unit
- Center for Social Science Innovation; Injury Prevention Research Center; Health, Sport, and Human Physiology
- Record Identifier
- 9984259393102771
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