Committee on Military Nutrition Research Activity Report 1992-1994 (1994) / Chapter Skim
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Pages 115-128
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From page 115... ...
Appendix G Conclusions and Recommendations from the Brief Report: Review of the Results of Nutritional Intervention' Ranger Training Class ll/92 (Ranger lI) Submitted June 1995
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From page 117... ...
there was increased energy intake throughout the Ranger II study; there was an increase in protein intake during the field training exercises in Ranger II; the sequence of training sites was changed; field rations were changed at mid point of Ranger II; 117
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From page 118... ...
. The following outcome differences were noted: · Ranger II trainees exhibited increased energy intake and increased energy expenditure when compared with the Ranger I trainees; · body weight and percent body fat were preserved to a greater extent in the Ranger II study; · the high frequency of extremely low levels of percent body fat that were seen in the Ranger I trainees were not observed in Ranger II; .
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From page 119... ...
Recommendations: To further address the question of medical risk, the CMNR recommends that comprehensive studies be conducted in a small number of subjects, beginning immediately after their Ranger training has been completed. The subjects should include men with the highest percentages of losses in body weight and body fat.
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From page 120... ...
Discussion: The increase in calories provided in Ranger II compared to Ranger I appeared to have a beneficial effect with regard to minimizing body weight loss and excessive depletion of body fat stores. It appeared however, that performance decrements measured by lift capacity were not systematically changed by the extra caloric supplement provided in Ranger II.
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From page 121... ...
The apparently beneficial effect on cognitive performance of refeeding must be assessed independently of possible beneficial effects of additional sleep (Mid-Mountain Phase)
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From page 122... ...
The elevated plasma zinc concentrations, noted as a group average during Ranger II, are most unusual and unexpected. In stressful situations of many varieties, plasma zinc values typically decline as a result of zinc sequestration in the liver, where zinc becomes bound to metallothionines, newly induced by cytokines such as IL-1.
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From page 123... ...
Answer: Some immunological changes noted during Ranger II can clearly be caused by the decreased plane of nutrition. Other concomitant stressors (including loss of sleep; severe, prolonged, and repeated muscular exertion; dermal inflammation and abrasions; and minor infections)
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From page 124... ...
The reduction in DDH responsiveness could be attributed to the progressive losses of body weight and nutrient stores, as seen in the Ranger trainees, as well as to the other stressors they experienced. However, the contribution of each stressor cannot be differentiated.
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From page 125... ...
Further, because a particular cognitive deficit may be of little significance to successful performance in one situation but critical to performance in another, the answer to this question requires a full consideration of the nature of activities in which the student is engaged during training. Discussion and Recommendations: The data show relatively strong effects of the Ranger training regimen on several aspects of cognitive function, including a 33°/O decrement in decoding speed, a 7°/O decrement in memory
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From page 126... ...
Notwithstanding these impressive findings, this study represents only the first attempt to systematically assess the effects of Ranger training on cognitive function and performance and it is unknown whether the same effects occur in other classes, and if so, to what degree. It is also unknown whether other, yet unmeasured, aspects of psychological and cognitive function necessary for effective performance might be negatively impacted by the stressors experienced during this type of training.
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From page 127... ...
Clearly, this type of information should continue to be collected in future studies of Ranger training and the results shared with Rangers during debriefing. The committee agrees with the recommendation of the principal researcher, MAJ Mays, that scheduling brief periods of recovery should be considered for possible implementation.
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From page 128... ...
effects of the physical and psychological stressors following the course be beneficial? Through combining the results on sleep deprivation from the two Ranger studies with the cognitive data from Ranger II, the scientists involved in the studies could make suggestions to the Ranger Training Brigade.
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