Abstract
We examined the effects of progressive resistance training (PRT) and supplementation with calcium-vitamin D3 fortified milk on markers of systemic inflammation, and the relationship between inflammation and changes in muscle mass, size and strength. Healthy men aged 50–79 years (n = 180) participated in this 18-month randomized controlled trial that comprised a factorial 2 × 2 design. Participants were randomized to (1) PRT + fortified milk supplement, (2) PRT, (3) fortified milk supplement, or (4) a control group. Participants assigned to PRT trained 3 days per week, while those in the supplement groups consumed 400 ml day−1 of milk containing 1,000 mg calcium plus 800 IU vitamin D3. We collected venous blood samples at baseline, 12 and 18 months to measure the serum concentrations of IL-6, TNF-α and hs-CRP. There were no exercise × supplement interactions, but serum IL-6 was 29% lower (95% CI, −62, 0) in the PRT group compared with the control group after 12 months. Conversely, IL-6 was 31% higher (95% CI, −2, 65) in the supplement group compared with the non-supplemented groups after 12 and 18 months. These between-group differences did not persist after adjusting for changes in fat mass. In the PRT group, mid-tibia muscle cross-sectional area increased less in men with higher pre-training inflammation compared with those men with lower inflammation (net difference ~2.5%, p < 0.05). In conclusion, serum IL-6 concentration decreased following PRT, whereas it increased after supplementation with fortified milk concomitant with changes in fat mass. Furthermore, low-grade inflammation at baseline restricted muscle hypertrophy following PRT.
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Acknowledgments
This study was financially supported by a grant from the Australian Research Council (ARC) Linkage Scheme. Professor Robin Daly is supported by a National Health and Medical Research Council (NHMRC) Career Development Award (ID 425849). Presented at the American College of Sport Medicine Annual Meeting, Seattle, Washington, May 29, 2009. We thank Tiana Mahncke for analysing the QCT scans. We also thank Murray Goulburn Co-operative Co Ltd for providing the calcium-vitamin D3 low fat UHT fortified milk used in the study, and the City of Greater Geelong and Ocean View Health Club for their generous provision of the gymnasium facilities used throughout the study. The authors also thank the following people for contributions to this study: Shona Bass, Nicole Petrass, Joanne Daly and Sam Korn.
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Communicated by William J. Kraemer.
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Peake, J.M., Kukuljan, S., Nowson, C.A. et al. Inflammatory cytokine responses to progressive resistance training and supplementation with fortified milk in men aged 50+ years: an 18-month randomized controlled trial. Eur J Appl Physiol 111, 3079–3088 (2011). https://doi.org/10.1007/s00421-011-1942-z
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DOI: https://doi.org/10.1007/s00421-011-1942-z