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Impact of body mass index on the relationship between muscle quality and physical function in older women

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The journal of nutrition, health & aging

Abstract

Objectives

To investigate the impact of body mass index (BMI) (normal weight, overweight, obese) on the relationship between muscle quality (MQ) and physical function in community-dwelling older women.

Design

Cross-sectional study.

Setting

University research laboratory.

Participants

Community-dwelling older women (n = 94, 73.6 ± 5.4 y) stratified by BMI (normal weight: 20.0–24.9 kg/m2; overweight: 25.0–29.9 kg/m2; obese: ≥ 30.0 kg/m2).

Measurements

Body mass index using height and weight, leg extension power via the Nottingham power rig, body composition using dual-energy X-ray absorptiometry, and physical function (6-minute walk, 8-foot up-and-go, 30-second chair stand). Muscle quality was defined as leg power (watts) normalized for lower-body mineral-free lean mass (kg).

Results

Following adjustments for covariates, muscle quality was significantly higher in women of normal BMI compared to overweight (10.0 ± 0.4 vs 8.7 ± 0.4 watts/kg, p = 0.03). Muscle quality was a significant predictor of performance on the 6-minute walk and 8-foot up-and-go in normal and overweight women (all p < 0.05) and performance on the 30-second chair stand in normal and obese women (both p < 0.05). Body mass index did not significantly impact the association between MQ and physical function (all p > 0.05).

Conclusions

Muscle quality varies by BMI, yet the relationship to physical function is not significantly different across BMI groups. The results imply that interventions that increase MQ in older women may improve physical function, regardless of BMI.

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Authors and Affiliations

  1. Department of Kinesiology, University of Georgia, Athens, GA, 30602, USA

    Anne O. Brady, C. R. Straight, M. D. Schmidt & E. M. Evans

  2. Department of Kinesiology, University of Georgia, 330 River Road, Athens, GA, 30602, USA

    Anne O. Brady

Authors
  1. Anne O. Brady
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  2. C. R. Straight
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  3. M. D. Schmidt
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  4. E. M. Evans
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Correspondence to Anne O. Brady.

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Brady, A.O., Straight, C.R., Schmidt, M.D. et al. Impact of body mass index on the relationship between muscle quality and physical function in older women. J Nutr Health Aging 18, 378–382 (2014). https://doi.org/10.1007/s12603-013-0421-0

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  • DOI: https://doi.org/10.1007/s12603-013-0421-0

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