Effect of prolonged exercise at 65 and 80% of VO2max on running economy.

Abstract

The purpose of this study was to investigate the effect of prolonged exercise at 65 and 80% of VO2max on running economy. Fourteen male long distance runners performed two 90-min runs on an outdoor 400 m track at velocities of 65 and 80% of VO2max. Prior to and following each 90-min run, running economy was measured as the steady-state VO2 during treadmill runs at speeds of 188 and 228 m/min. During the 90-min run at 65% of VO2max, the mean weight loss was 1.3 kg. HR increased from 143 bpm between minutes 5-10 to 150 bpm between minutes 85-90. During the 90-min run at 80% of VO2max, the mean weight loss was 1.4 kg. The HR was 161 bpm between minutes 5-10 and increased to 165 bpm between minutes 85-90. When the post running economy test was conducted following each 90-min run, there was a significant increase in VO2 expressed in both l/min and ml/kg min. The increase in VO2 following the 90-min run at 80% of VO2max. These results suggest that 90-min runs at 65 and 80% of VO2max alter running economy with a significant increase in oxygen cost.

• Authors: F Xu, D L Montgomery
• Journal: International journal of sports medicine (Int J Sports Med) Vol. 16 Issue 5 Pg. 309-13 (Jul 1995) ISSN: 0172-4622 [Print] Germany
• PMID: 7558528 (Publication Type: Journal Article)

Topics

• Adult
• Exercise (physiology)
• Heart Rate
• Humans
• Male
• Middle Aged
• Oxygen Consumption
• Physical Endurance (physiology)
• Running (physiology)