Document Type

Journal Article

Publication Title

Applied Physiology, Nutrition and Metabolism

Volume

50

PubMed ID

39197174

Publisher

Canadian Science Publishing

School

School of Medical and Health Sciences

RAS ID

76845

Funders

Defence Science Center (G1005184) / Australian Army Headquarters

Comments

Uphill, A. C., Kendall, K. L., Baker, B. A., Guppy, S. N., Brown, H. M., Vacher, M., ... & Haff, G. G. (2024). The physiological consequences of and recovery following the Australian Special Forces Selection Course. Applied Physiology, Nutrition, and Metabolism, 50, 1-13. https://doi.org/10.1139/apnm-2024-0117

Abstract

This study aimed to determine the energy requirements, physiological consequences, and recovery rate from the Australian Special Forces Selection Course. Ninety-three male soldiers (mean ± SD, 28.1 ± 3.6 years, 1.81 ± 0.1 m, 85.1 ± 8.1 kg) vol-unteered for this study. Body composition via dual-energy X-ray absorptiometry, hormones and resting metabolic rate were assessed before, immediately after, and at 1, 3, 5, and 8 weeks post-course. Energy expenditure, assessed via doubly-labelled water during the first 10 days of the course significantly exceeded energy intake (expenditure: 7680 ± 1095 kcal. day–1, in-take: 3859 ± 704 kcal. day– 1). Body mass (Δ–6.8 ± 1.9 kg, p < 0.01), fat mass (Δ –4.2 ± 1.0 kg, p < 0.0001) and lean mass (Δ–3.0 ± 1.7 kg, p < 0.0001) were significantly reduced in response to the course and returned to baseline 1–3 weeks post-course. Total testosterone, free testosterone, free triiodothyronine, free thyroxine and insulin like growth factor-1 significantly (p < 0.001) declined following the course, while cortisol and sex hormone binding globulin increased (p < 0.001). All hormones, except insulin like growth factor-1, returned to baseline concentrations within 1–3 weeks post-course. Resting metabolic rate decreased (p < 0.01) in response to the course, and subsequently rebounded above baseline levels at 1 week post-course. The Special Forces Selection Course involved high energy output and a substantial caloric deficit, resulting in body mass loss and significant hormonal disruption that took weeks to recover. These results highlight the energy requirements, physiological consequences, and recovery processes from the Australian Special Forces Selection Course.

DOI

10.1139/apnm-2024-0117

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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