Abbas Rezaee; Masoud Rahimi; Majid Jalili; Farzad Nazem
Volume 11, Issue 26 , June 2023, , Pages 8-19
Abstract
Background and Aim: Accurate and fast estimation of maximal oxygen uptake (VO2max) as an indicator of cardio-respiratory fitness (CRF) by regression equations without exercise tests in large populations is of great importance in the field of health and sport sciences. Therefore, the aim of this study ...
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Background and Aim: Accurate and fast estimation of maximal oxygen uptake (VO2max) as an indicator of cardio-respiratory fitness (CRF) by regression equations without exercise tests in large populations is of great importance in the field of health and sport sciences. Therefore, the aim of this study was to evaluate the cross-validation of the non-native non-exercise (N-EX) regression equations in estimating VO2max of healthy and adolescent boys using the standard method of respiratory gas analysis. Material and Methods: This research was a cross-sectional study in which 349 healthy boys children and adolescents (age: 12.49±2.72 year, BMI: 20.13±4.70 kg/m2 and VO2max: 41.50±6.47 ml/kg/min) were participated. VO2max was measured on a treadmill by the respiratory gas analysis in modified Bruce exercise test (criterion method) and then estimated by three non-native N-EX regression equations. To evaluate the cross-validation the validity of the N-EX regression equations, Pearson correlation, paired sample t-test and Bland-Altman agreement were used for extraction of results. Results: A significant correlation was observed between VO2max measured by criterion method and N-EX equations (R=0.63 - 0.73, p
