Source
Department of Exercise Science, Bloomsburg University, Bloomsburg, PA.
Abstract
Recently, it was demonstrated that a uniaxial accelerometer worn at the hip could estimate resistance exercise energy expenditure. As resistance exercise takes place in more than one plane, the use of a triaxial accelerometer may be more effective in estimating resistance exercise energy expenditure. The purpose of this study was to estimate the energy cost of resistance exercise using triaxial accelerometry, and to determine the optimal location for wearing triaxial accelerometers during resistance exercise. Thirty men and women (15 M; 15 W; 21.7 ? 1.0 yr) performed a resistance exercise protocol consisting of two sets of eight exercises (10 RM loads). During the resistance exercise protocol, subjects wore triaxial accelerometers on the wrist, waist, and ankle, a heart rate monitor, and a portable metabolic system. Net energy expenditure was significantly correlated with vertical (r = 0.67, p <0.001), horizontal (r = 0.43, p = 0.02), third axis (r = 0.36, p = 0.048), and sum of three axes (r = 0.50, p = 0.005) counts at the waist, and horizontal counts at the wrist (r = -0.40, p = 0.03). Regression analysis using fat free mass, sex, and the sum of accelerometer counts at the waist as variables was used to develop an equation that explained 73% of the variance of resistance exercise energy expenditure. A triaxial accelerometer worn at the waist can be used to estimate resistance exercise energy expenditure, but appears to offer no benefit over uniaxial accelerometry. The use of accelerometers in estimating resistance exercise energy expenditure may prove useful for individuals and athletes who participate in resistance training and are focused on maintaining a tightly regulated energy balance.
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