TY - JOUR
T1 - Effects of priming exercise on V·O2 kinetics and the power-duration relationship
AU - Burnley, Mark
AU - Davison, Glen
AU - Baker, Jonathan Robert
PY - 2011/11
Y1 - 2011/11
N2 - Purpose: To investigate the influence of prior heavy- and severe-intensity exercise on the oxygen uptake (V·O2) kinetics and the power-duration relationship.
Methods: Ten cyclists performed 13 exercise tests over a 4 week period, consisting of a ramp test to determine the gas exchange threshold (GET) and the peak V·O2, followed by a series of square-wave tests to exhaustion under three conditions: no prior exercise (control), prior heavy exercise (6 min at a work rate above GET but below critical power (CP)) and prior severe exercise (6 min at a work rate above the CP). Pulmonary gas exchange was measured throughout the exhaustive exercise bouts and the parameters of the power duration relationship (CP and the curvature constant, W) were determined from the linear work-time model.
Results: Prior heavy exercise increased the amplitude of the primary V·O2 response (by ~0.19 ± 0.28 L·min-1, P = 0.001), reduced the slow component trajectory (by 0.04 ± 0.09 L·min-2; P = 0.002) and increased the time to exhaustion (by ~52 ± 92 s; P = 0.005). The CP was unchanged (control vs. prior heavy: 284 ± 47 vs. 283 ± 44 W; 95% CI, -7, 5 W) whereas the W was increased by heavy-intensity priming (16.0 ± 4.8 vs. 18.7 ± 4.8 kJ; 95% CI, 0.3, 5.2 kJ). Severe-intensity exercise had a similar effect on the V·O2 kinetics, but had no effect on the time to exhaustion, the CP (275 ± 45 W) or the W (16.7 ± 4.7 kJ).
Conclusion: Prior heavy-intensity exercise primes the V·O2 kinetics and increases the amount of work that can be performed above the CP.
AB - Purpose: To investigate the influence of prior heavy- and severe-intensity exercise on the oxygen uptake (V·O2) kinetics and the power-duration relationship.
Methods: Ten cyclists performed 13 exercise tests over a 4 week period, consisting of a ramp test to determine the gas exchange threshold (GET) and the peak V·O2, followed by a series of square-wave tests to exhaustion under three conditions: no prior exercise (control), prior heavy exercise (6 min at a work rate above GET but below critical power (CP)) and prior severe exercise (6 min at a work rate above the CP). Pulmonary gas exchange was measured throughout the exhaustive exercise bouts and the parameters of the power duration relationship (CP and the curvature constant, W) were determined from the linear work-time model.
Results: Prior heavy exercise increased the amplitude of the primary V·O2 response (by ~0.19 ± 0.28 L·min-1, P = 0.001), reduced the slow component trajectory (by 0.04 ± 0.09 L·min-2; P = 0.002) and increased the time to exhaustion (by ~52 ± 92 s; P = 0.005). The CP was unchanged (control vs. prior heavy: 284 ± 47 vs. 283 ± 44 W; 95% CI, -7, 5 W) whereas the W was increased by heavy-intensity priming (16.0 ± 4.8 vs. 18.7 ± 4.8 kJ; 95% CI, 0.3, 5.2 kJ). Severe-intensity exercise had a similar effect on the V·O2 kinetics, but had no effect on the time to exhaustion, the CP (275 ± 45 W) or the W (16.7 ± 4.7 kJ).
Conclusion: Prior heavy-intensity exercise primes the V·O2 kinetics and increases the amount of work that can be performed above the CP.
KW - CYCLING PERFORMANCE
KW - EXERCISE TOLERANCE
KW - CYCLING
KW - MUSCLE METABOLIC-RESPONSES
KW - OXYGEN-UPTAKE KINETICS
KW - CRITICAL POWER
KW - GAS-EXCHANGE KINETICS
KW - SPRINT EXERCISE
KW - HIGH-INTENSITY EXERCISE
KW - PERIMAXIMAL EXERCISE
KW - PRIOR HEAVY EXERCISE
KW - SLOW COMPONENT
KW - OXYGEN UPTAKE KINETICS
KW - PULMONARY O-2 UPTAKE
UR - http://hdl.handle.net/2160/8443
U2 - 10.1249/MSS.0b013e31821ff26d
DO - 10.1249/MSS.0b013e31821ff26d
M3 - Article
C2 - 21552161
SN - 1530-0315
VL - 43
SP - 2171
EP - 2179
JO - Medicine and Science in Sports and Exercise
JF - Medicine and Science in Sports and Exercise
IS - 11
ER -