Predicting Energy Expenditure of an Acute Resistance Exercise

Energy expenditure of resistance exercise (RE) is an important consideration for exercise prescription and weight management, yet prediction models are lacking. Purpose To develop regression equations to predict energy expenditure (kcal) for RE involving each major muscle group using commonly measured demographic and exercise variables as predictors. Methods Fifty-two healthy, active subjects (27 men, 25 women, age 20-58 years, height 174.1 ± 10.5 cm, weight 188.7 ± 42.6 kg, VO2max 36.8 ± 9.2 ml/kg/min) were strength tested to estimate their 1-repetition max (1RM) one week prior to their experimental RE bout. The experimental RE bout consisted of a warm-up set followed by 2-3 sets (2-min turnover) of 8-12 reps at 60-70% of predicted 1 repetition max for leg press, chest press, leg curl, lat pull, leg extension, triceps push down, biceps curl. Kcals were estimated from VO2 measured continuously throughout the RE bout via an automated metabolic cart. Total exercise volume (TV) was calculated as sets*reps*weight lifted. Multiple Linear Regression (Stepwise Removal) was used to determine the best model (highest adjusted R2) to predict the kcal consumption of the total workout and of the individual RE lifts. Results The derived regression equation for the net kcal consumption of a RE bout was: Total Net Kcal = 0.874(Height, cm) - 0.596(Age, years) - 1.016(Fat Mass, kg) + 1.638(Lean Mass, kg) + 2.461(TV x 10-3) - 110.742 (R2 = 0.773, SEE=28.5 kcal). Significant equations were also derived for individual lifts (R2 = 0.62 to 0.83). Conclusions Net energy expenditure for a total RE bout and for individual resistance exercises can be reasonably estimated in adult men and women using commonly measured demographic and RE variables. Corresponding Author: Brad S. Lambert Ph.D. Department of Orthopedics and Sports Medicine Houston Methodist Hospital 6670 Bertner Ave, Houston, TX 77030 Email: bslambert@houstonmethodist.org Disclosures: The authors declare no conflict of interest. No funding was received for this research. Submitted for publication August 2018. Accepted for publication February 2019. © 2019 American College of Sports Medicine

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