Energy Expenditure and Changes in Body Composition During Submarine Deployment-An Observational Study "DasBoost 2-2017"

Gerard Rietjens, Jasper Most*, Peter J. Joris, Pieter Helmhout, Guy Plasqui

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Web of Science)

Abstract

The present study was designed to objectively assess the effects of 3-months submarine deployment on behavioural and metabolic determinants of metabolic health. In 13 healthy, non-obese volunteers, we using stable isotope dilution, and plasma and urinary biochemistry to characterize metabolic health before and after a 3-month submarine deployment. Volunteers worked in 6-h shifts. After deployment, we observed reduced fat-free mass (mean +/- SD, -4.1 +/- 3.3 kg, p = 0.003) and increased adiposity (21.9 +/- 3.2% fat mass to 24.4 +/- 4.7%, p = 0.01). Changes in fat-free mass were positively associated with physical activity (+0.8 kg per 0.1 increase in PAL, p = 0.03). The average physical activity level was 1.64 +/- 0.26 and total energy expenditure during deployment was 2937 +/- 498 kcal/d, while energy intake was 3158 +/- 786 kcal/d. Fasting glucose (p = 0.03), and triglycerides (p = 0.01) declined, whereas fasting free fatty acids increased (p = 0.04). Plasma vitamin D and B12 concentrations decreased (-14%, p = 0.04, and -44%, p = 0.001, respectively), and plasma calcium, and magnesium increased (+51%, p = 0.01, and +5%, p = 0.02). Haemoglobin was unchanged, but haematocrit decreased (-2.2 +/- 2.1%, p = 0.005). In conclusion, submarine deployment impairs fat-free mass maintenance and promotes adiposity. High physical activity may prevent the decline in fat-free mass. Our study confirms the need to counteract Vitamin D and B12 deficiencies, and suggests impairments in erythrocyte metabolism.

Original languageEnglish
Article number226
Number of pages11
JournalNutrients
Volume12
Issue number1
DOIs
Publication statusPublished - Jan 2020

Keywords

  • submarine
  • energy expenditure
  • doubly labelled water
  • body composition
  • adiposity
  • physical activity
  • VITAMIN-D SUPPLEMENTATION
  • MUSCLE PROTEIN-SYNTHESIS
  • DOUBLY-LABELED WATER
  • FAT-FREE MASS
  • WEIGHT-LOSS
  • MEAL FREQUENCY
  • PERFORMANCE
  • DEFICIENCY
  • INSULIN
  • MARKERS

Cite this