Isokinetic Dynamometry in Healthy Versus Sarcopenic and Malnourished Elderly: Beyond Simple Measurements of Muscle Strength

Joel T. Cramer, Nathaniel D.M. Jenkins, Vikkie A. Mustad, Joseph P. Weir

Research output: Contribution to journalArticle

2 Citations (Scopus)

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°·s-1 and 180°·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°·s-1. Velocity-related decreases in PT from 60°·s-1 to 180°·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°·s-1 to 180°·s-1 may reflect greater losses of fast-twitch (type II) fiber function.

Original languageEnglish (US)
Pages (from-to)709-732
Number of pages24
JournalJournal of Applied Gerontology
Volume36
Issue number6
DOIs
StatePublished - Jun 1 2017

Fingerprint

Muscle Strength
Torque
Knee
Maintenance

Keywords

  • angular velocity
  • atrophy
  • fast-twitch
  • sarcopenia
  • slow-twitch
  • type II fibers

ASJC Scopus subject areas

  • Gerontology
  • Geriatrics and Gerontology

Cite this

Isokinetic Dynamometry in Healthy Versus Sarcopenic and Malnourished Elderly : Beyond Simple Measurements of Muscle Strength. / Cramer, Joel T.; Jenkins, Nathaniel D.M.; Mustad, Vikkie A.; Weir, Joseph P.

In: Journal of Applied Gerontology, Vol. 36, No. 6, 01.06.2017, p. 709-732.

Research output: Contribution to journalArticle

@article{7091547140254126890a690320020b02,
title = "Isokinetic Dynamometry in Healthy Versus Sarcopenic and Malnourished Elderly: Beyond Simple Measurements of Muscle Strength",
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°·s-1 and 180°·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°·s-1. Velocity-related decreases in PT from 60°·s-1 to 180°·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°·s-1 to 180°·s-1 may reflect greater losses of fast-twitch (type II) fiber function.",
keywords = "angular velocity, atrophy, fast-twitch, sarcopenia, slow-twitch, type II fibers",
author = "Cramer, {Joel T.} and Jenkins, {Nathaniel D.M.} and Mustad, {Vikkie A.} and Weir, {Joseph P.}",
year = "2017",
month = "6",
day = "1",
doi = "10.1177/0733464815584669",
language = "English (US)",
volume = "36",
pages = "709--732",
journal = "Journal of Applied Gerontology",
issn = "0733-4648",
publisher = "SAGE Publications Inc.",
number = "6",

}

TY - JOUR

T1 - Isokinetic Dynamometry in Healthy Versus Sarcopenic and Malnourished Elderly

T2 - Beyond Simple Measurements of Muscle Strength

AU - Cramer, Joel T.

AU - Jenkins, Nathaniel D.M.

AU - Mustad, Vikkie A.

AU - Weir, Joseph P.

PY - 2017/6/1

Y1 - 2017/6/1

N2 - 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°·s-1 and 180°·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°·s-1. Velocity-related decreases in PT from 60°·s-1 to 180°·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°·s-1 to 180°·s-1 may reflect greater losses of fast-twitch (type II) fiber function.

AB - 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°·s-1 and 180°·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°·s-1. Velocity-related decreases in PT from 60°·s-1 to 180°·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°·s-1 to 180°·s-1 may reflect greater losses of fast-twitch (type II) fiber function.

KW - angular velocity

KW - atrophy

KW - fast-twitch

KW - sarcopenia

KW - slow-twitch

KW - type II fibers

UR - http://www.scopus.com/inward/record.url?scp=85019077537&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85019077537&partnerID=8YFLogxK

U2 - 10.1177/0733464815584669

DO - 10.1177/0733464815584669

M3 - Article

C2 - 25948290

AN - SCOPUS:85019077537

VL - 36

SP - 709

EP - 732

JO - Journal of Applied Gerontology

JF - Journal of Applied Gerontology

SN - 0733-4648

IS - 6

ER -