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Muscle quality, aerobic fitness and fat mass predict lower-extremity physical function in community-dwelling older adults.
Gerontology. 2007; 53(5):260-6.G

Abstract

BACKGROUND

Muscle mass, strength and fitness play a role in lower-extremity physical function (LEPF) in older adults; however, the relationships remain inadequately characterized.

OBJECTIVE

This study aimed to examine the relationships between leg mineral free lean mass (MFLM(LEG)), leg muscle quality (leg strength normalized for MFLM(LEG)), adiposity, aerobic fitness and LEPF in community-dwelling healthy elderly subjects.

METHODS

Fifty-five older adults (69.3 +/- 5.5 years, 36 females, 19 males) were assessed for leg strength using an isokinetic dynamometer, body composition by dual energy X-ray absorptiometry and aerobic fitness via a treadmill maximal oxygen consumption test. LEPF was assessed using computerized dynamic posturography and stair ascent/descent, a timed up-and-go task and a 7-meter walk with and without an obstacle.

RESULTS

Muscle strength, muscle quality and aerobic fitness were similarly correlated with static LEPF tests (r range 0.27-0.40, p < 0.05); however, the strength of the independent predictors was not robust with explained variance ranging from 9 to 16%. Muscle quality was the strongest correlate of all dynamic LEPF tests (r range 0.54-0.65, p < 0.001). Using stepwise linear regression analysis, muscle quality was the strongest independent predictor of dynamic physical function explaining 29-42% of the variance (p < 0.001), whereas aerobic fitness or body fat mass explained 5-6% of the variance (p < 0.05) depending on performance measure.

CONCLUSIONS

Muscle quality is the most important predictor, and aerobic fitness and fat mass are secondary predictors of LEPF in community-dwelling older adults. These findings support the importance of exercise, especially strength training, for optimal body composition, and maintenance of strength and physical function in older adults.

Authors+Show Affiliations

Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Urbana, Ill 61801, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17446711

Citation

Misic, Mark M., et al. "Muscle Quality, Aerobic Fitness and Fat Mass Predict Lower-extremity Physical Function in Community-dwelling Older Adults." Gerontology, vol. 53, no. 5, 2007, pp. 260-6.
Misic MM, Rosengren KS, Woods JA, et al. Muscle quality, aerobic fitness and fat mass predict lower-extremity physical function in community-dwelling older adults. Gerontology. 2007;53(5):260-6.
Misic, M. M., Rosengren, K. S., Woods, J. A., & Evans, E. M. (2007). Muscle quality, aerobic fitness and fat mass predict lower-extremity physical function in community-dwelling older adults. Gerontology, 53(5), 260-6.
Misic MM, et al. Muscle Quality, Aerobic Fitness and Fat Mass Predict Lower-extremity Physical Function in Community-dwelling Older Adults. Gerontology. 2007;53(5):260-6. PubMed PMID: 17446711.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Muscle quality, aerobic fitness and fat mass predict lower-extremity physical function in community-dwelling older adults. AU - Misic,Mark M, AU - Rosengren,Karl S, AU - Woods,Jeffrey A, AU - Evans,Ellen M, Y1 - 2007/04/18/ PY - 2006/09/21/received PY - 2007/03/03/accepted PY - 2007/4/21/pubmed PY - 2007/9/29/medline PY - 2007/4/21/entrez SP - 260 EP - 6 JF - Gerontology JO - Gerontology VL - 53 IS - 5 N2 - BACKGROUND: Muscle mass, strength and fitness play a role in lower-extremity physical function (LEPF) in older adults; however, the relationships remain inadequately characterized. OBJECTIVE: This study aimed to examine the relationships between leg mineral free lean mass (MFLM(LEG)), leg muscle quality (leg strength normalized for MFLM(LEG)), adiposity, aerobic fitness and LEPF in community-dwelling healthy elderly subjects. METHODS: Fifty-five older adults (69.3 +/- 5.5 years, 36 females, 19 males) were assessed for leg strength using an isokinetic dynamometer, body composition by dual energy X-ray absorptiometry and aerobic fitness via a treadmill maximal oxygen consumption test. LEPF was assessed using computerized dynamic posturography and stair ascent/descent, a timed up-and-go task and a 7-meter walk with and without an obstacle. RESULTS: Muscle strength, muscle quality and aerobic fitness were similarly correlated with static LEPF tests (r range 0.27-0.40, p < 0.05); however, the strength of the independent predictors was not robust with explained variance ranging from 9 to 16%. Muscle quality was the strongest correlate of all dynamic LEPF tests (r range 0.54-0.65, p < 0.001). Using stepwise linear regression analysis, muscle quality was the strongest independent predictor of dynamic physical function explaining 29-42% of the variance (p < 0.001), whereas aerobic fitness or body fat mass explained 5-6% of the variance (p < 0.05) depending on performance measure. CONCLUSIONS: Muscle quality is the most important predictor, and aerobic fitness and fat mass are secondary predictors of LEPF in community-dwelling older adults. These findings support the importance of exercise, especially strength training, for optimal body composition, and maintenance of strength and physical function in older adults. SN - 1423-0003 UR - https://www.unboundmedicine.com/medline/citation/17446711/Muscle_quality_aerobic_fitness_and_fat_mass_predict_lower_extremity_physical_function_in_community_dwelling_older_adults_ L2 - https://www.karger.com?DOI=10.1159/000101826 DB - PRIME DP - Unbound Medicine ER -