A constant-load exercise bout to exhaustion after a graded exercise test to verify maximal oxygen uptake (Vo2 max) during cycle ergometry has not been evaluated in sedentary adults with obesity. Nineteen sedentary men (n 10) and women (n 9) with obesity (age 35.8 ± 8.6 years; body mass index [BMI] 35.9 ± 5.1 kg·m -2; body fat percentage 44.9 ± 7.2) performed a ramp-style maximal exercise test (ramp), followed by 5-10 minutes of active recovery, and then performed a constant-load exercise bout to exhaustion (verification test) on a cycle ergometer for determination of Vo2 max and maximal heart rate (HRmax). Vo2 max did not differ between tests (ramp: 2.29 ± 0.71 L·min-1, verification: 2.34 ± 0.67 L·min-1; p 0.38). Maximal heart rate was higher on the verification test (177 ± 13 b·min-1 vs. 174 ± 16 b·min-1; p 0.03). Thirteen subjects achieved a Vo2 max during the verification test that was ≥2% (range: 2.0-21.0%; 0.04-0.47 L·min-1) higher than during the ramp test, and 8 subjects achieved a HRmax during the verification test that was 4-14 b·min-1 higher than during the ramp test. Duration of verification or ramp tests did not affect Vo2 max results, but the difference in HRmax between the tests was inversely correlated with ramp test duration (r -0.57, p 0.01). For both Vo2 max and HRmax, differences between ramp and verification tests were not correlated with BMI or body fat percentage. A verification test may be useful for identifying the highest Vo2 max and HRmax during cycle ergometry in sedentary adults with obesity.
- exercise prescription
- exercise testing
- maximal oxygen uptake
ASJC Scopus subject areas
- Orthopedics and Sports Medicine
- Physical Therapy, Sports Therapy and Rehabilitation