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Estimation of resistance exercise energy expenditure using accelerometry.

Eric S Rawson1, Talia M Walsh

  • 1Department of Exercise Science, Bloomsburg University, Bloomsburg, PA 17815, USA. erawson@bloomu.edu

Medicine and Science in Sports and Exercise
|December 3, 2009
PubMed
Summary

Estimating resistance exercise energy expenditure is now feasible using accelerometers. A waist-worn accelerometer, combined with participant sex and fat-free mass, accurately predicts energy expenditure during resistance training.

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Area of Science:

  • Exercise Physiology
  • Biomedical Engineering
  • Sports Science

Background:

  • Resistance exercise is crucial for health, yet accurately measuring its energy expenditure is challenging.
  • Accelerometers offer a practical, cost-effective solution for estimating energy expenditure without limiting movement.

Purpose of the Study:

  • To determine if accelerometry can estimate resistance exercise energy expenditure.
  • To investigate how accelerometer location (wrist, waist, ankle) affects activity count accuracy.

Main Methods:

  • Thirty adults performed eight resistance exercises, wearing accelerometers on the wrist, waist, and ankle.
  • Energy expenditure was simultaneously measured using a portable metabolic system for comparison.

Main Results:

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  • Waist and ankle accelerometer counts showed significant correlations with energy expenditure.
  • Waist accelerometer counts alone explained 59% of the variance in energy expenditure.
  • A regression model including waist accelerometer counts, sex, and fat-free mass explained 90% of the variance.

Conclusions:

  • A uniaxial accelerometer worn at the waist is effective for estimating resistance exercise energy expenditure.
  • Incorporating participant sex and fat-free mass further enhances the accuracy of these estimations.