title: Influence of initial metabolic rate on the power-duration relationship for all-out exercise.
abstract: A single 3-min all-out cycling test can be used to estimate the power asymptote (critical power, CP) and the curvature constant (W') of the power-duration relationship for severe-intensity exercise. It was hypothesized that when exercise immediately preceding the 3-min all-out test was performed <CP, the CP and W' parameters would be unaffected, whereas preceding exercise >CP would systematically reduce the W' without affecting the CP. Seven physically active males completed 3-min all-out cycling tests in randomized order immediately preceded by: unloaded cycling (control); 6-min moderate; 6-min heavy; 2-min severe (S2); or 4-min severe (S4) intensity exercise. The CP was estimated from the mean power output over the final 30 s of the test and the W' was estimated as the power-time integral above end-test power. There were no significant differences in the CP between control (279 ± 62), moderate (275 ± 52), heavy (286 ± 66 W), S2 (274 ± 55), or S4 (273 ± 65 W). The W' was significantly lower (P < 0.05) in S2 (11.5 ± 2.5) and S4 (8.9 ± 2.2) than in control (16.3 ± 2.3), moderate (17.2 ± 2.4) and heavy (15.6 ± 2.3 kJ). These results support the notion that the W' is predictably depleted only at a power output >CP whereas the CP is independent of the mechanisms which reduce W'.
authors: Sport and Health Sciences, College of Life and Environmental Sciences, St Luke's Campus, University of Exeter, Heavitree Road, Exeter, EX1 2LU, UK.
authors: Len
authors: L
authors: Parker Simpson
authors: Andrew M
authors: AM
authors: Jones
authors: Anni
authors: A
authors: Vanhatalo
authors: Daryl P
authors: DP
authors: Wilkerson
mesh_terms: D000328:Adult; D003198:Computer Simulation; D004735:Energy Transfer / Q000502:physiology*; D006801:Humans; D008297:Male; D008657:Metabolic Clearance Rate; D008954:Models, Biological; D010100:Oxygen / Q000502:physiology*; D010101:Oxygen Consumption / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*
chemical_list: D010100:Oxygen