Importance of Proper Scaling of Aerobic Power When Relating to Cardiometabolic Risk Factors In Children
Background: The relationship between cardiometabolic risk factors (CMRF) and aerobic power (VO 2max) scaled as mL O2 per kilogram body mass is controversial because mass includes both fat and fat-free mass, and fat mass is independently associated with the CMRF. Aim: To examine common units used to scale VO 2max and their relationships to mean blood pressure (MBP), total cholesterol (TC), HDL cholesterol, triglycerides (TG), insulin resistance (HOMA-IR) and cumulative risk score (z-score). Subjects: 1784, 8-18 year-old youths, 938 girls and 886 boys. Methods: Fasting blood samples were obtained. VO 2max was estimated in mL/min from cycle ergometry and scaled to body mass (kg), fat free mass (kgFFM), body surface area (m 2), height (cm) and allometric (mL/kg 0.67/min). Results: Unadjusted correlations between CMRF and many of the scaled VO 2max units were significant (p < 0.0001), especially for MBP, HOMA-IR, HDL and z-score, with lower correlations for TC and TG. After adjusting for ancestry, sex, height and body fat associations were greatly weakened (r < 0.09), except for MBP. Conclusions: On a population basis, the physical characteristics of the child, especially body fat, are more related to CMRF than any scaled units of VO 2max; thus care is needed when relating fitness and health issues.
MSU Digital Commons Citation
McMurray, Robert G.; Hosick, Peter; and Bugge, Anna, "Importance of Proper Scaling of Aerobic Power When Relating to Cardiometabolic Risk Factors In Children" (2011). Department of Exercise Science and Physical Education Scholarship and Creative Works. 40.