Harris R Lieberman

..Our laboratory developed a brief, intense, laboratory-based simulation of a multistressor environment which included sleep loss, continuous physical activity, and food deprivation...

..This study investigated factors associated with Soldiers' confidence in the efficacy and safety of DS, and assessed Soldiers' knowledge of federal DS regulatory requirements...

..Labels of caffeine-containing products should provide caffeine content so individuals can make informed decisions...

..During military basic combat training (BCT), mood state, physical performance and body composition substantially improve, providing an opportunity to examine relationships between mood and nutritional and hormonal biomarkers...

..Therefore, test meals varying in caloric content, but indistinguishable in sensory characteristics, were formulated using hydrocolloid-based gels as the principal structural component...

..Acute cold stress is often accompanied by exposure to other adverse factors, such as sleep loss, under-nutrition, and psychological stress that singly and together may affect cognitive function...

..Anecdotal reports suggest that the use of dietary supplements (DSs) by soldiers may reflect their unique occupational requirements and the complexity of their job and family responsibilities...

..To the extent possible, efforts to blind both volunteers and investigators should be an important consideration in study design...

..Military exercises generate high levels of stress to simulate combat, providing a unique opportunity to examine cognitive and physiologic responses of normal humans to acute stress...

..Decrements in iron status have been reported in female soldiers during military training. Diminished iron status adversely affects physical and cognitive performance...

..Anecdotal reports from military conflicts suggest cognitive performance and mood are severely degraded by the stress of combat. However, little objective information is available to confirm these observations...

..When humans are acutely exposed to multiple stressors, cognitive performance is substantially degraded. Few practical strategies are available to sustain performance under such conditions...

..05). This study demonstrates cold exposure degrades cognitive performance and supplementation with TYR alleviates working memory decrements...

..Moderate HYP had no effect on cognitive and psychomotor performance in either environment, cold exposure produced equivocal effects, and aerobic exercise improved some aspects of military task performance...

..This study demonstrates that changes in stress-related behaviors of adult animals occur following brief exposure to low-protein diets...

..The neurochemical basis for these effects may be a change in DA efflux, although other mechanisms cannot be ruled out...

..To address relationships between movement, physical exertion, and cognitive performance, vigilance performance while soldiers walked with a heavy (40 kg) load was examined...

..However, the relationship between iron status and body composition in non-obese adults remains unclear...

..This device acquires minute-by-minute information on an individual's physical activity and can distinguish sleep from waking, the most basic aspect of behavior...

..Iron status degrades in female soldiers during military training. Inflammation-mediated up-regulation of hepcidin, a key mediator of iron homeostasis, may be a contributing factor...

..Compared to temperate conditions, total energy expenditures did not appear to be influenced by hot weather, but tended to be higher in the cold or high altitude conditions...

..Caffeine was administered to minimize deficits due to sleep deprivation...

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..05) were observed after Cr ingestion. Creatine supplementation over 5 days improved performance during a controlled strength test but did not significantly improve military obstacle course performance...

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..These results carry implications for the theorized interactions between caffeine, adenosine and dopamine in brain regions mediating visual attention...

..Extending meal times and providing additional meals or "take out" foods may allow energy needs of SF soldiers (approximately 4,200 kcal/day) to be met, while reducing the reliance on potentially less nutritious outside foods...

..Our laboratory conducted a study of female recruits in USMC RT that assessed the nature and the extent of cognitive, nutritional, and physical changes that occur during this unique period of structured mental and physical training...

..BC did not alter time-trial performance, cognitive performance, mood, perceived exertion, or perceived thermal comfort. We conclude that BCAA does not alter exercise or cognitive performance in the heat when subjects are hypohydrated...

..Future studies should strive to determine the impact of military clothing and seasonality on vitamin D status, as well as the functional impact of declining vitamin D status on bone health...

..The brain's utilization of glucose also increases during aerobic exercise. However, the effects of energy supplementation on cognitive function during sustained aerobic exercise are not well characterized...

..These findings suggest a negative effect of an HG weight loss diet on sub-clinical depression but, in contrast to a previous suggestion, provide no support for differential effects of LG versus HD diets on cognitive performance...

..Female athletes and military personnel should strive to maintain Fe status to optimise physical performance...

..Carbohydrate supplementation appears to enhance cognitive performance in soldiers engaged in sustained, intense physical activities that expend high levels of energy...

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..The most common information sources reportedly used were popular magazines/books (75%), friends/teammates (55%), physicians/nurses, radio/television (34%), and the Internet (31%)...

..In addition, it demonstrates that moderate heat stress impairs coping behavior, as well as working and reference memory...

..However, the number of controlled studies in the literature is too limited to demonstrate consistent anticoagulant effects of dietary supplements alone or in combination with drug therapy...

..Dynamic postural stability at 10 °C appeared to be hampered by low-grade shivering, but was otherwise maintained during HYP and thermal stress...

..Tyrosine (when compared to placebo) had no effect on any sleep related measure, but it did stimulate prolactin release...

..As a naturally occurring amino acid, and thus amenable to nutritional strategies, tyrosine may deserve further testing...

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..The objective of this study was to determine whether moderate doses of caffeinated tube foods would enhance performance in a simulated U-2 mission...

..These tests are sensitive to factors that both increase and decrease mental energy. Critical factors in the design and conduct of studies used to assess mental energy are also discussed...