• Rafael Jimenez-Flores, Jacob Heick, Steven C Davis, Kellie Green Hall, and Andrew Schaffner.
• Dairy Products Technology Center, Department of Dairy Science, California Polytechnic State University, San Luis Obispo, CA 93407-0257, USA.
• Mil Med. 2012 Jun 1; 177 (6): 723-31.

AbstractThis study compared the effects of a higher protein supplement manufactured from milk vs. a commercially available higher carbohydrate supplement on serum markers of muscle damage, anaerobic exercise, choice reaction time, and body composition during 2 weekends of vigorous hikes with simulated mountain skirmishes. Thirty-five university students, including Reserve Officers Training Corps cadets and athletes, carried 25% of their body weight (up to 26.4 kg) on Friday, Saturday, and Sunday hikes. Supplementation and Wingate tests followed each hike, and choice reaction testing preceded and followed each hike. Blood samples were obtained and body compositions were measured pre- and postweekend. Increased cortisol, highly sensitive C-reactive protein, creatine phosphokinase, and aldolase suggested the exercise regimen induced muscle damage and inflammation, which was attenuated during the second weekend of hikes. Absolute anaerobic capacity was somewhat greater following consumption of the milk supplement (p = 0.082). Body compositions did not change significantly during this study. Choice reaction times decreased following hikes and were significantly faster following consumption of the carbohydrate supplement (p < 0.04). Supplements including milk proteins and carbohydrates may improve endurance exercise and decision-making abilities of military personnel and endurance athletes.

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