title: Pediatric Obesity and Perceived Exertion: Difference Between Weight-Bearing and Non-Weight-Bearing Exercises Performed at Different Intensities.
abstract: Excess body weight composes an important limitation to exercise in obese youth. The aim of this study was to compare the perceived exertion of obese adolescents between weight-bearing (WB; running) and non-weight-Bearing (NWB; cycling) exercises performed at moderate (55% VO2max) and high (75% VO2max) intensities. Twenty-four obese adolescents were recruited. After assessment of their body composition and physical capacities, they had to complete four isoenergetic exercise sessions: (1) a cycling session performed at 55% of their maximal capacities (NWB-55%); (2) a cycling session set at 75% (NWB-75%); (3) a running session at 55% (WB-55%); and (4) a running session at 75% (WB-75%). Perceived exertion was assessed using a visual scale at regular interval. While no significant difference between WB and NWB modalities was observed, the adolescents expressed a significantly lower rate of perceived exertion (RPE) during exercises at 55%VO2max (P < 0.0001). An intensity × modality interaction revealed that RPE was lower at 75% VO2max during NWB exercises (P < 0.05). While obese adolescents expressed lower RPE during exercise at moderate intensity whatever its modality, low level of perceived exertion has been observed during high-intensity exercises and especially during NWB. High-intensity exercise appears well tolerated in adolescents when their body weight is supported.
authors.affiliation: a Laboratory of the Metabolic Adaptations to Exercise under Physiological and Pathological Conditions (AME2P) , Clermont University, Blaise Pascal University, EA 3533 , Aubière Cedex , France.
authors.forename: D
authors.initials: D
authors.lastname: Thivel
authors.affiliation: b Laboratory Culture Sport Health Society, EA 4660, and Exercise Performance , Health, Innovation Platform, Franche-Comte University , Besançon , France.
authors.forename: L
authors.initials: L
authors.lastname: Isacco
authors.affiliation: c Physiotherapy Department , Temple Street Children's University Hospital , Dublin , Ireland.
authors.forename: G
authors.initials: G
authors.lastname: O'Malley
authors.affiliation: a Laboratory of the Metabolic Adaptations to Exercise under Physiological and Pathological Conditions (AME2P) , Clermont University, Blaise Pascal University, EA 3533 , Aubière Cedex , France.
authors.forename: P
authors.initials: P
authors.lastname: Duché
mesh_terms: D000293:Adolescent; D000886:Anthropometry; D001642:Bicycling / Q000502:physiology; D050218:Body Fat Distribution; D015992:Body Mass Index; D005260:Female; D006801:Humans; D008297:Male; D063766:Pediatric Obesity / Q000503:physiopathology / Q000523:psychology*; D010465:Perception; D010806:Physical Education and Training / Q000379:methods*; D005082:Physical Exertion; D055070:Resistance Training; D012420:Running / Q000502:physiology
keywords: exercise intensity; exercise modality; paediatric obesity; perceived exertion