Effects of Supplemental Energy on Protein Balance during 4-d Arctic Military Training.

Soldiers often experience negative energy balance during military operations that diminish whole-body protein retention, even when dietary protein is consumed within recommended levels (1.5-2.0 g[BULLET OPERATOR]kg-1[BULLET OPERATOR]d-1). Purpose: Determine if providing supplemental nutrition spares whole-body protein by attenuating the level of negative energy balance induced by military training, and to assess whether protein balance is differentially influenced by macronutrient source. Methods: Soldiers participating in 4-d arctic military training (AMT, 51 km ski march) randomized to receive 3 combat rations (CON; n = 18); 3 combat rations plus 4, 20g, 250 kcal protein-based bars (PRO; n = 28); or 3 combat rations plus 4, 48g, 250 kcal carbohydrate-based bars daily (CHO; n = 27). Energy expenditure (D2 18O) and energy intake were measured daily. Nitrogen balance (NBAL) and protein turnover were determined at baseline (BL) and day 3 of AMT using 24 h urine and [15N]-glycine. Results: Protein and carbohydrate intake were highest (P

from Sports Medicine via xlomafota13 on Inoreader http://ift.tt/25ONjda
via IFTTT