Evaluation of the ACSM submaximal ergometer test for estimating VO2max

Area of Science:

• Exercise Physiology
• Cardiorespiratory Fitness Assessment

Background:

• Maximal oxygen uptake (VO2max) is a key indicator of cardiorespiratory fitness.
• Submaximal tests are often used to estimate VO2max due to their lower cost and accessibility.
• The American College of Sports Medicine (ACSM) submaximal cycle ergometer test is a widely used protocol.

Purpose of the Study:

• To evaluate the reliability and validity of estimated maximal oxygen uptake (ESTmax) derived from the ACSM submaximal cycle ergometer test.
• To compare ESTmax with directly measured VO2max.
• To assess the consistency of ESTmax between repeated submaximal trials.

Main Methods:

• 15 men and 15 women (aged 21-54 years) completed two ACSM submaximal cycle ergometer tests and one maximal cycle ergometer test.
• Heart rates were monitored during submaximal tests.
• ESTmax was calculated by extrapolating heart rate to age-predicted maximal heart rate.

Main Results:

• Reliability analysis showed a correlation coefficient (r) of 0.863 and a standard error of measurement (SEmeas) of 0.40 L/min between submaximal trials.
• Despite no significant difference in trial means, a high SEmeas (13% of the mean) indicated substantial individual variability.
• The ACSM protocol significantly overestimated measured VO2max, with a mean error of 0.63 L/min (25.7% error).

Conclusions:

• The ACSM submaximal cycle ergometer protocol demonstrated poor reliability due to significant individual variations between trials.
• The protocol consistently overestimates VO2max.
• The findings suggest that the ACSM submaximal test is not suitable for accurate VO2max assessments and should be used with caution.