Date of this Version

1-1-2015

Document Type

Journal Article

Publication Details

Published Version

Shultz, S. P., Dahiya, R., Leong, G. M., Rowlands, D. S., Hills, A. P., & Byrne, N. M. (2015). Muscular strength, aerobic capacity, and adipocytokines in obese youth after resistance training: A pilot study. Australasian Medical Journal, 8(4), 113-120.

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© Copyright, The Authors, 2015

2015 HERDC Submission

ISSN

1836-1935

Abstract

Abstract

Background Exercise has shown positive training effects on obesity-related inflammation, however, resistance training has shown mixed results concerning adipocytokine levels. Aims The purpose of thispilot study was to explore the effects of resistance training on blood adipocytokine concentrations in obese youth, with specific examination of the relationship between these biomarkers and improved fitness (i.e., aerobic capacity, muscular strength). Methods Fourteen obese adolescents (16.1 ± 1.6 y; BMI: 32.3 ± 3.9 kg/m2) participated in a 16-week resistance training intervention. Body composition, fasting blood concentrations of interleukin-6 (IL-6), tumour necrosis factor-alpha (TNF-α), adiponectin, and leptin were measured pre- and post-training. Aerobic capacity was assessed via amaximal discontinuous exercise test. The rate of gain in muscular strength was calculated as the slope of progression in 1-repetition maximum throughout the intervention. Results Resistance trainingincreased lean mass (total, trunk) and decreased per cent body fat (total, trunk). The training also caused moderate clear decreases in IL-6 and TNF-α concentrations. A small increase in adiponectin was also observed before and after intervention. When the group was stratified by changes in aerobic capacity, there were substantially larger decreases in leptin levels for those with improved capacity. Correlation analyses also revealed a negative relationship between log-transformed leptin and aerobic capacity at rest. Improvement in quadriceps strength was positively correlated with IL-6 and TNF-α, while improvement in shoulder adductor strength was positively correlated with IL-6 only. Conclusion Resistance training improved adipocytokine markers, which were partially associated with improved physical fitness. Specifically, the relationship between strength improvements and IL-6 and TNF-α suggests an exercise-induced signalling pathway that results in overall adaptive decreases in systemic inflammation in obese youth

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