Methods: Eight men with CAD (65.7 ± 4.5 yr, VO2max 18.6 ± 4.1 ml/kg/min, BMI 29.7±3.3 kg/m-2) exercised on a treadmill for 20 min at a self-regulated intensity. They were allowed to change the velocity and grade every 5 min. Respiratory metabolic and gas exchange variables were measured continuously using open circuit spirometry. Heart rate was continuously recorded using telemetry, and undifferentiated RPE (RPE-O) was recorded every 5 min using the Borg 15-category scale.
Results: Perceptual and physiological responses remained stable after the first 5 min of exercise. Subjects exercised at 65.7 ± 14.2 % VO2max and 94 ± 5.0 % HRpeak during the final 15 min of self regulated exercise. This equates to a treadmill velocity of 5.3 ± 0.9 km/h, and a grade of 0.7 ± 1.1. The RPE-O was 12.0 ± 2.0, and falls between the verbal descriptors of fairly light and somewhat hard.
Conclusion: When allowed to self-regulate their exercise intensity, men with CAD select an intensity that is perceived to be fairly light to somewhat hard, and elicits a physiological response likely to improve cardiovascular health.
|Number of pages||1|
|Journal||Medicine and Science in Sports and Exercise|
|Publication status||Published - May 2011|