title: Non-exercise VO2max estimation for physically active college students.
abstract: This study sought to develop a maximal oxygen consumption (VO2max) regression model derived strictly from self-reported non-exercise (N-EX) predictor variables. The VO2max (mean +/- SD; 44.05 +/- 6.6 ml.kg-1.min-1) of 100 physically active college students (50 females, 50 males), aged 18 to 29 yr, was measured using a treadmill protocol and open circuit calorimetry. Questionnaire-based predictor variables used in the N-EX regression model included (a) the subject's perceived functional ability (PFA) to walk, jog, or run given distances, (b) habitual physical activity (PA-R) data, (c) body mass index (BMI), and (d) gender. BMI (kg.m-2) was computed from self-reported body weight in pounds and self-reported body height in feet and inches. The questionnaire-based N-EX regression model (R = 0.85, SEE = 3.44 ml.kg-1.min-1) developed in this study exceeded the accuracy of previously developed N-EX regression models and is comparable to many exercise-based regression models in the literature. Cross-validation using PRESS (predicted residual sum of squares) statistics demonstrated minimal shrinkage (R = 0.84, SEE = 3.60 ml.kg-1.min-1) of the present regression model. The PFA data were useful in explaining observed VO2max variance (squared partial r2 = 0.155, P < 0.0001) and enhanced the ability of the N-EX regression model to accurately predict criterion VO2max. These results suggest that a questionnaire-based N-EX regression model provides a valid and convenient method for predicting VO2max in physically active college students.
authors.affiliation: Department of Exercise Science and Physical Education, Arizona State University, Tempe 85287, USA. jim_george@byu.edu
authors.forename: J D
authors.initials: JD
authors.lastname: George
authors.forename: W J
authors.initials: WJ
authors.lastname: Stone
authors.forename: L N
authors.initials: LN
authors.lastname: Burkett
mesh_terms: D000293:Adolescent; D000328:Adult; D001827:Body Height; D015992:Body Mass Index; D001835:Body Weight; D002151:Calorimetry; D005080:Exercise Test; D005260:Female; D005544:Forecasting; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007590:Jogging / Q000502:physiology; D008297:Male; D009043:Motor Activity / Q000502:physiology; D010101:Oxygen Consumption / Q000502:physiology*; D010465:Perception; D010809:Physical Fitness / Q000502:physiology*; D011659:Pulmonary Gas Exchange / Q000502:physiology; D012044:Regression Analysis; D015203:Reproducibility of Results; D012146:Rest; D012420:Running / Q000502:physiology; D012737:Sex Factors; D011795:Surveys and Questionnaires; D016138:Walking / Q000502:physiology