Abstract
PURPOSE To compare the magnitude of excess post oxygen consumption (EPOC) following leg press resistance exercise (RE) at slow versus moderate speeds of movement METHODS Thirteen RE trained females (age 27.4 ± 7.6 yr; ht. 164.2 ± 7.3 cm; mass 63.2 ± 9.4 kg) participated in two randomly assigned trials on the leg press with at least 48 hours between trials. Both trials consisted of a four second eccentric phase and a one second pause, but the slow speed protocol (S) and moderate speed protocol (M) used an eight second and three second concentric phase, respectively. To ensure equal intensity (100 percent), all trials were concluded at momentary muscular fatigue. Oxygen consumption (VO2) was measured by open circuit spirometry, at rest, exercise and during EPOC, with blood lactate obtained pre-exercise and at minutes 4, 15, and 30, post-exercise. Statistical analysis by ANOVA (p < .05) was applied to these data. RESULTS There was no significant difference (NSD) between trials in total EPOC (3032 ± 1235 vs 2928 ± 875 mL. min-1), immediate 5 min post-exercise EPOC (411 ± 159) and (423 ± 100), any subsequent EPOC interval, resting VO2 peak HR, blood lactate, and exercise caloric expenditure for the S vs M trials, respectively. A significant difference was noted only for time under load (TUL) (163+42 vs 128+35 sec) for S vs M trials, respectively. CONCLUSION Slow to moderate speeds of resistance exercise movement performed at matched intensity, do not differ in metabolic response despite differences in TUL.
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