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Erschienen in: The journal of nutrition, health & aging 8/2019

03.08.2019

Lower-Extremity Torque Capacity and Physical Function in Mobility-Limited Older Adults

verfasst von: Gregory J. Grosicki, D. A. Englund, L. Price, M. Iwai, M. Kashiwa, K. F. Reid, R. A. Fielding

Erschienen in: The journal of nutrition, health & aging | Ausgabe 8/2019

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Abstract

Objectives

Skeletal muscle weakness and an increase in fatigability independently contribute to age-related functional decline. The objective of this study was to examine the combined contribution of these deficiencies (i.e., torque capacity) to physical function, and then to assess the functional implications of progressive resistance training (PRT) mediated-torque capacity improvements in mobility-limited older adults.

Design

Randomized controlled trial.

Setting

Exercise laboratory on the Health Sciences campus of an urban university.

Participants

Seventy mobility-limited (Short Physical Performance Battery (SPPB) ≤9) older adults (~79 yrs).

Intervention

Progressive resistance training or home-based flexibility 3 days/week for 12 weeks.

Measurements

Torque capacity was defined as the sum of peak torques from an isokinetic knee extension fatigue test. Relationships between torque capacity and performance-based and patient-reported functional measures before and after PRT were examined using partial correlations adjusted for age, sex, and body mass index.

Results

Torque capacity explained (P<0.05) 10 and 28% of the variance in six-minute walk distance and stair climb time, respectively. PRT-mediated torque capacity improvements were paralleled by increases (P<0.05) in self-reported activity participation (+20%) and advanced lower extremity function (+7%), and associated (P<0.05) with a reduction in activity limitations (r=0.44) and an improved SPPB score (r=0.32).

Conclusion

Skeletal muscle torque capacity, a composite of strength and fatigue, may be a proximal determinant of physical function in mobility-limited older individuals. To more closely replicate the musculoskeletal demands of real-life tasks, future studies are encouraged to consider the combined interaction of distinct skeletal muscle faculties to overall functional ability in older adults.
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Metadaten
Titel
Lower-Extremity Torque Capacity and Physical Function in Mobility-Limited Older Adults
verfasst von
Gregory J. Grosicki
D. A. Englund
L. Price
M. Iwai
M. Kashiwa
K. F. Reid
R. A. Fielding
Publikationsdatum
03.08.2019
Verlag
Springer Paris
Erschienen in
The journal of nutrition, health & aging / Ausgabe 8/2019
Print ISSN: 1279-7707
Elektronische ISSN: 1760-4788
DOI
https://doi.org/10.1007/s12603-019-1232-8

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