Adiposity is related to decrements in cardiorespiratory fitness in obese and normal-weight children

Tsiros, M. D. and Coates, A. M. and Howe, P. R. C. and Walkley, J. and Hills, A. P. and Wood, R. E. and Buckley, J. D. (2016) Adiposity is related to decrements in cardiorespiratory fitness in obese and normal-weight children. Pediatric Obesity, 11 (2). pp. 144-150. ISSN 2047-6302

Abstract

Background: Obese children are typically less physically active than their normal-weight peers and are often assumed to be 'unfit'. Objective Investigate the relationships between adiposity, physical activity levels and cardiorespiratory fitness (CRF) in obese and normal-weight children. A secondary aim was to examine obese/normal-weight differences in CRF. Methods Obese (N = 107) and normal-weight (N = 132) 10-13-year-olds participated. Fat-free mass (FFM), percent fat, physical activity and peak oxygen uptake (VO2peak) were assessed. Analyses were adjusted for socioeconomic status (SES). Results Higher percent fat was inversely associated with VO2peak normalized for mass (r = -0.780, P < 0.001) even after controlling for physical activity (r = -0.673, P < 0.001). While higher percent fat was also inversely associated with VO2peak normalized for FFM, this was only significant in males (r = -0.247, P = 0.004) and did not persist after controlling for physical activity (r = -0.059 P = 0.526). Compared with normal-weight children, obese children had higher absolute VO2peak, lower VO2peak corrected for mass (P ≤ 0.009) and lower VO2peak corrected for FFM (P = 0.041) that did not persist after controlling for SES (P = 0.086). Conclusion Obesity-related inefficiencies in CRF were evident. Higher adiposity was associated with poorer CRF relative to mass, irrespective of physical activity levels. However, low physical activity levels may be responsible for associations between adiposity and CRF relative to FFM seen in boys, indicating the importance of encouraging physical activity.


Statistics for USQ ePrint 31565
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 02 Jun 2017 05:58
Last Modified: 02 Jun 2017 05:58
Uncontrolled Keywords: Body mass index; child; cycle ergometry; peak oxygen uptake; Adiposity; Australia; Body Mass IndexCardiovascular Physiological Phenomena; Child; Female; Pediatric Obesity; Physical Fitness; Respiratory Physiological Phenomena
Fields of Research : 11 Medical and Health Sciences > 1114 Paediatrics and Reproductive Medicine > 111499 Paediatrics and Reproductive Medicine not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970111 Expanding Knowledge in the Medical and Health Sciences
Identification Number or DOI: 10.1111/ijpo.12037
URI: http://eprints.usq.edu.au/id/eprint/31565

Actions (login required)

View Item Archive Repository Staff Only