Nutrition Intervention to Promote Immune Recovery From Sleep Restriction

Physical and psychological stress on Warfighters during training and operational missions can suppress immune responsiveness. Skin wound models can be used to detect changes in immune function. Investigators have recently demonstrated that relatively modest sleep disruption degrades immune response at the site of the disrupted skin barrier and delays the initial restoration of the skin barrier. Provision of additional protein and a multi-nutrient beverage during and after sleep restriction seems to mitigate decrements in local immune function, without producing detectable effects on initial restoration of the skin barrier. However, the prior work used a parallel-group study design and inter-subject variability may have made it more difficult to detect significant differences in skin barrier restoration between participants receiving the nutrition intervention versus those receiving the placebo. Therefore, the purpose of the proposed cross-over study is to test the efficacy of a multi-nutrient beverage and additional protein (1.5 g protein per kg body weight versus 0.9 g protein per kg body weight) on immune function and the initial restoration of the skin barrier consequent to an operational stressor (i.e., 72-h sleep restriction). The effect of sleep restriction on a friend-foe marksmanship task, flow state, and measures of cognitive and neuromotor performance, will be investigated as a sub-study (Appendix A). Additionally, the effects of sleep restriction on appetite physiology, eating behaviors and intestinal permeability will be tested. Research will be conducted in a laboratory environment using male and female Soldiers from the human research participant detachment (NSRDEC), or Soldiers or civilians at NSRDEC and/or USARIEM. Participants in the study described herein (n = 20) will be exposed, in a single-blind, cross-over design to a \~72 hour normal sleep control phase, and to 2 periods of \~72 hours of sleep restriction (monitored in laboratory with \~2-h sl