Effects of air ventilation during stationary exercise testing

Eur J Appl Physiol. 2004 Jul;92(3):263-6. doi: 10.1007/s00421-004-1087-4. Epub 2004 Apr 9.

Abstract

The impact of air ventilation on performance and physiological responses during stationary exercise in the laboratory was studied. Fourteen well-trained cyclists performed three exercise tests on a cycle ergometer, each separated by a 1-week interval. The first test was a graded test to determine the power output corresponding with the 4-mmol l(-1) lactate level. Tests 2 and 3 were 30-min constant-load tests at a power output corresponding with this 4-mmol l(-1) lactate threshold. One constant-load test was performed in the absence (NAV), whilst the other was performed in the presence (AV) of air ventilation (3 m s(-1)). During the constant-load tests, heart rate, tympanic temperature, blood lactate concentration and oxygen uptake (VO2) were measured at 10-min intervals and at the end of the test. Differences between the two test conditions were evaluated using paired t-tests. During NAV, 12 subjects interrupted the test due to premature exhaustion (exercise duration <30 min), versus only seven in AV ( P<0.05). At the end of the test tympanic temperature was 35.9 (0.2) degrees C in AV and was higher in NAV [36.7 (0.2) degrees C, P<0.05]. Exercise heart rate increased at a faster rate during NAV [+2.2 (0.3) beats min(-1)] than during AV [+1.5 (0.2) beats min(-1), P<0.05]. Blood lactate concentration and VO2 were similar between conditions. Air ventilation is essential to prevent an upward shift in the lactate:heart rate as well as the power output:heart rate relationship during laboratory exercise testing and indoor exercise training.

Publication types

  • Clinical Trial
  • Controlled Clinical Trial

MeSH terms

  • Adaptation, Physiological / physiology
  • Adolescent
  • Adult
  • Air Movements
  • Body Temperature Regulation / physiology
  • Energy Transfer / physiology*
  • Exercise / physiology*
  • Exercise Test / methods*
  • Heart Rate / physiology
  • Humans
  • Lactic Acid / blood
  • Oxygen Consumption / physiology
  • Physical Exertion / physiology*
  • Task Performance and Analysis
  • Ventilation / methods*

Substances

  • Lactic Acid