Albane Bertha Rosa Maggio1, Philippe Vuistiner2, Antoinette Crettenand2, René Tabin3, Xavier Eric Martin4, Maurice Beghetti5, Nathalie Jacqueline Farpour-Lambert6, Olivier Deriaz7. 1. Paediatric Obesity Consultation, Service of Paediatric Specialties, Department of Child and Adolescent, University Hospitals of Geneva and University of Geneva, Switzerland; Centre Universitaire de Cardiologie Pédiatrique, University of Lausanne and Gene. 2. Institute for Research in Rehabilitation, Clinique Romande de Réadaptation SuvaCare, Sion, Switzerland. 3. Paediatric Department, Romand Valais Hospital, Sion, Switzerland. 4. Paediatric Obesity Consultation, Service of Paediatric Specialties, Department of Child and Adolescent, University Hospitals of Geneva and University of Geneva, Switzerland. 5. Paediatric Cardiology Unit, Service of Paediatric Specialties, Department of Child and Adolescent, University Hospitals of Geneva and University of Geneva, Switzerland; Centre Universitaire de Cardiologie Pédiatrique, University of Lausanne and Geneva, S. 6. Obesity Prevention and Care Programme "Contrepoids", Service of Therapeutic Education for Chronic Diseases, Department of Community Medicine, Primary Care and Emergency, University Hospitals of Geneva and University of Geneva, Switzerland; Paediatric. 7. Centre Universitaire de Cardiologie Pédiatrique, University of Lausanne and Geneva, Switzerland.
Abstract
AIM OF THE STUDY: Maximal exercise testing may be difficult to perform in clinical practice, especially in obese children who have low cardiorespiratory fitness and exercise tolerance. We aimed to elaborate a model predicting peak oxygen consumption (VO2) in lean and obese children with use of the submaximal Chester step test. METHODS: We performed a maximal step test, which consisted of 2-minute stages with increasing intensity to exhaustion, in 169 lean and obese children (age range: 7-16 years). VO2 was measured with indirect calorimetry. A statistical Tobit model was used to predict VO2 from age, gender, body mass index (BMI) z-score and intensity levels. Estimated VO2peak was then determined from the heart rate-VO2 linear relationship extrapolated to maximal heart rate (220 minus age, in beats.min-1). RESULTS: VO2 (ml/kg/min) can be predicted using the following equation: VO2 = 22.82 - [0.68*BMI z-score] - [0.46*age (years)] - [0.93*gender (male = 0; female = 1)] + [4.07*intensity level (stage 1, 2, 3 etc.)] - [0.24*BMI z-score *intensity level] - [0.34*gender*intensity level]. VO2 was lower in participants with high BMI z-scores and in female subjects. CONCLUSION: The Chester step test can assess cardiorespiratory fitness in lean and obese children in clinical settings. Our adapted equation allows the Chester step test to be used to estimate peak aerobic capacity in children.
AIM OF THE STUDY: Maximal exercise testing may be difficult to perform in clinical practice, especially in obesechildren who have low cardiorespiratory fitness and exercise tolerance. We aimed to elaborate a model predicting peak oxygen consumption (VO2) in lean and obesechildren with use of the submaximal Chester step test. METHODS: We performed a maximal step test, which consisted of 2-minute stages with increasing intensity to exhaustion, in 169 lean and obesechildren (age range: 7-16 years). VO2 was measured with indirect calorimetry. A statistical Tobit model was used to predict VO2 from age, gender, body mass index (BMI) z-score and intensity levels. Estimated VO2peak was then determined from the heart rate-VO2 linear relationship extrapolated to maximal heart rate (220 minus age, in beats.min-1). RESULTS: VO2 (ml/kg/min) can be predicted using the following equation: VO2 = 22.82 - [0.68*BMI z-score] - [0.46*age (years)] - [0.93*gender (male = 0; female = 1)] + [4.07*intensity level (stage 1, 2, 3 etc.)] - [0.24*BMI z-score *intensity level] - [0.34*gender*intensity level]. VO2 was lower in participants with high BMI z-scores and in female subjects. CONCLUSION: The Chester step test can assess cardiorespiratory fitness in lean and obesechildren in clinical settings. Our adapted equation allows the Chester step test to be used to estimate peak aerobic capacity in children.
Authors: Emma S Cowley; Paula M Watson; Lawrence Foweather; Sarahjane Belton; Chiara Mansfield; Gabriella Whitcomb-Khan; Isabella Cacciatore; Andrew Thompson; Dick Thijssen; Anton J M Wagenmakers Journal: Children (Basel) Date: 2021-01-22