Weight change underway and in port in the American Navy
1989
Gaston, B.M.
The introduction of strict weight control guidelines in the American Navy has drawn attention to a theory that obese sailors lose weight more readily at sea than ashore. I tested this hypothesis retrospectively over a 13 month period on a large American naval vessel, using data on 40 obese men who were weighed weekly as part of a mandatory health and physical readiness program. Included in the study period were both a 25 week deployment and a 29 week extended in port period. Ten subjects were enrolled for the entire 13 months, and their mean in port and underway weight changes were compared using a paired t test. Regression analysis was also performed comparing time underway or in port with net weight change for all subjects. The 10 men enrolled for 13 months had a mean weight loss of 6.6 kg during the underway period and a mean weight gain of 4.3 kg during the in port period (P < 0.005). Number of weeks underway and number of weeks in port were found to correlate with number of kilograms lost and gained, respectively (P < 0.005). These data suggest that men who have strong incentives to lose weight do so more effectively at sea than after returning from sea.
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