Abstract
BACKGROUND: The purpose of this study was to examine the influence of prior intermittent running at VO2max on oxygen kinetics during a continuous severe intensity run and the time spent at VO2max.
METHODS: Eight long-distance runners performed three maximal tests on a synthetic track (400 m) whilst breathing through the COSMED K4 portable telemetric metabolic analyser: i) an incremental test which determined velocity at the lactate threshold (vLT), VO2max and velocity associated with VO2max (vVO2max), ii) a continuous severe intensity run at vLT+50% (vdelta50) of the difference between vLT and vVO2max (91.3+/-1.6% VO2max)preceded by a light continuous 20 minute run at 50% of vVO2max (light warm-up), iii) the same continuous severe intensity run at vdelta50 with a prior interval training exercise (hard warm-up) of repeated hard running bouts performed at 100% of vVO2max and light running at 50% of vVO2max (of 30 seconds each) performed until exhaustion (on average 19+/-5 min with 19+/-5 interval repetitions). This hard warm-up speeded the VO2 kinetics: the time constant was reduced by 45% (28+/-7 sec vs 51+/-37 sec) and the slow component of VO2 (deltaVO2 6-3 min) was deleted (-143+/-271 ml x min(-1) vs 291+/-153 ml x min(-1)). In conclusion, despite a significantly lower total run time at vdelta50 (6 min 19+/-0) min 17 vs 8 min 20+/-1 min 45, p=0.02) after the intermittent warm-up at VO2max, the time spent specifically at VO2max in the severe continuous run at vdelta50 was not significantly different.
Original language | English |
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Pages (from-to) | 185-94 |
Number of pages | 10 |
Journal | Journal of Sports Medicine and Physical Fitness |
Volume | 40 |
Issue number | 3 |
Publication status | Published - Sept 2000 |
Externally published | Yes |
Keywords
- Adult
- Algorithms
- Anaerobic Threshold/physiology
- Exercise Test
- Exercise Tolerance/physiology
- Heart Rate/physiology
- Humans
- Lactates/blood
- Male
- Oxygen/blood
- Oxygen Consumption/physiology
- Physical Endurance/physiology
- Running/physiology
- Statistics, Nonparametric
- Telemetry/instrumentation
- Time Factors