Accession Number : ADA262085


Title :   Hypohydration Does Not Impair Skeletal Muscle Glycogen Resynthesis After Exercise


Descriptive Note : Journal article


Corporate Author : ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA


Personal Author(s) : Neufer, P D ; Sawka, Michael N ; Young, Andrew J ; Quigley, Mark D ; Latzka, Williams A ; Levine, Leslie


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262085.pdf


Report Date : Jan 1991


Pagination or Media Count : 5


Abstract : The purpose of this investigation was to examine the effects of moderate hypohydration (HY) on skeletal muscle glycogen resynthesis after exhaustive exercise. On two occasions, eight males completed 2 h of intermittent cycle ergometer exercise (4 bouts of 17 min at 60% and 3 min at 80% of maximal O2 consumption/10 min rest) to reduce muscle glycogen concentrations (control values 711 + 41 micromol/g dry wt). During one trial, cycle exercise was followed by several hours of light upper body exercise in the heat without fluid replacement to induce HY (-5% body wt); in the second trial, sufficient water was ingested during the upper body exercise and heat exposure to maintain euhydration (EU). In both trials, 400 g of carbohydrate were ingested at the completion of exercise and followed by 15 h of rest while the desired hydration level was maintained. Muscle biopsy samples were obtained from the vastus lateralis immediately after intermittent cycle exercise (TI) and after 15 h of rest (T2). During the HY trial, the muscle water content was lower (P 0.05) at T1 and T2 (288 +/- 9 and 265 +/- 5 ml/100 g dry wt, respectively; NS) than during EU (313 +/- 8 and 301 +/- 4 ml/100 g dry wt, respectively; NS). Muscle glycogen concentration was not significantly different during EU and HY at T1 (200 +/- 35 vs. 251 +/- 50 micromol/g dry wt) or T2 (452 +/- 34 vs. 491 vs. 35 micromol/g dry wt). These data indicate that, despite reduced water content during the first 15 h after heavy exercise, skeletal muscle glycogen resynthesis is not impaired.


Descriptors :   *SYNTHESIS(CHEMISTRY) , *DEHYDRATION , *SKELETON , *GLYCOGEN , REPRINTS , BODY FLUIDS , MUSCLE RELAXANTS , EXERCISE(PHYSIOLOGY) , HEAT STRESS(PHYSIOLOGY) , BODY WEIGHT , WATER


Subject Categories : Anatomy and Physiology


Distribution Statement : APPROVED FOR PUBLIC RELEASE