Serum Hormone Concentrations and Body Composition in Brazilian Air Force Cadets During Rainforest Survival Training

ABSTRACT Background Physiological adaptations in military jungle survival training have not yet been studied. Knowledge about the relationship between the insulin-like growth factor type I (IGF-I)/insulin-like growth factor binding protein type 3 (IGFBP-3) system and survival activities in a jungle...

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Bibliographic Details
Published in:Military medicine 2023-11, Vol.188 (11-12), p.3302-3308
Main Authors: Magraner, José Maurício Paixão Dos Santos, Talarico Neto, Thomaz, Hahns Júnior, Higino Carlos, Tourinho Filho, Hugo, Martinelli Júnior, Carlos Eduardo
Format: Article
Language:English
Subjects:
Body composition
Body fat
Insulin-like growth factors
Military personnel
Military training
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Summary:ABSTRACT Background Physiological adaptations in military jungle survival training have not yet been studied. Knowledge about the relationship between the insulin-like growth factor type I (IGF-I)/insulin-like growth factor binding protein type 3 (IGFBP-3) system and survival activities in a jungle environment can improve readiness and prepare Brazilian Air Force cadets for this kind of battlefield. Our goal was to assess changes in body composition and serum concentrations of the IGF-I/IGFBP-3 system in Brazilian Air Force cadets during five-day Amazon rainforest survival training and whether differences in sex influence these variations. Methods In the five-day survival training, variations in body composition and serum levels of IGF-I and IGFBP-3 were observed. The sample consisted of 14 male cadets (21.71 ± 1.64 years) and 6 female cadets (22.00 ± 1.41 years). Changes were assessed before and immediately after the survival training. Results The male cadets’ body mass (pre: 73.89 ± 8.79 kg; post: 69.57 ± 8.44 kg), body fat (pre: 11.43 ± 4.15%; post: 10.16 ± 4.19%), IGF-I serum concentrations (pre: 252 ± 72 ng/mL; post: 140 ± 42 ng/mL), and IGFBP-3 serum concentrations (pre: 4.90 ± 0.67 ng/mL; post: 4.22 ± 0.73 ng/mL) were significantly reduced (P 
ISSN:0026-4075
1930-613X
DOI:10.1093/milmed/usac201