Resistance Exercise Energy Expenditure is Greater with Fatigue as Compared to Non-Fatigue
Journal of Exercise Physiology Online
Anaerobic Energy Expenditure, Oxygen Uptake, EPOC, Lactate, Resistance Training
Scott CB, Earnest CP. Resistance Exercise Energy Expenditure is Greater with Fatigue as Compared to Non-Fatigue. JEPonline 2011;14(1):1-10. We retrospectively investigated data from two separate studies to estimate and compare aerobic and anaerobic exercise energy expenditure (EE) along with the aerobic recovery EE component for 1-set of resistance exercise. One study was completed using non-fatiguing lifts where the exercise was stopped before muscular failure. In another study muscular failure (fatigue) was the end point of all lifts. Work (weight lifted × upward vertical displacement) and all EE components were examined. Non-fatiguing lifts were carried out at 50% of a 1-RM for 7, 14 and 21 repetitions. Lifts to failure were carried out at ~37%, ~46%, ~56%, 70%, 80% and 90% of a 1-RM. Individual regression lines were created for fatigue and non-fatigue conditions for each male subject between work and all estimates of EE. The results of our analyses showed that the averaged slopes between fatigue and non-fatigue were proportional for: total EE/work (p = 0.87), anaerobic exercise EE/work, (p = 0.73) and recovery EE/work (p = 0.19). However, the Y-intercepts of the two studies were significantly greater for fatiguing as compared to non-fatiguing lifting for: total EE/work (p = 0.007), anaerobic exercise EE/work (p = 0.001) and recovery EE/work (p = 0.01), but not aerobic exercise EE/work (p = 0.17). For aerobic exercise EE/work, lifting to fatigue had a greater O2 uptake/work slope as compared to lifts that were not completed to fatigue (p = 0.04). We conclude that lifting a weight to muscular failure can entail significantly greater aerobic, anaerobic and recovery EE components as compared to non-fatiguing lifting.
Scott, C. B., & Earnest, C. P. (2011). Resistance exercise energy expenditure is greater with fatigue as compared to non-fatigue. Journal of Exercise Physiology Online, 14(1), 1-10.