JEPonlineDec2009Lamont.doc - Diet and Recovery 33 Journal of Exercise Physiologyonline(JEPonline Volume 12 Number 6 December 2009 Managing Editor Tommy

JEPonlineDec2009Lamont.doc - Diet and Recovery 33 Journal...

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Journal of Exercise Physiology online (JEP online ) Volume 12 Number 6 December 2009 Managing Editor Tommy Boone, PhD, MPH Editor-in-Chief Jon K. Linderman, PhD Review Board Todd Astorino, PhD Julien Baker, PhD Tommy Boone, PhD Eric Goulet, PhD Robert Gotshall, PhD Alexander Hutchison, PhD M. Knight-Maloney, PhD Len Kravitz, PhD James Laskin, PhD Derek Marks, PhD Cristine Mermier, PhD Chantal Vella, PhD Ben Zhou, PhD Official Research Journal of the American Society of Exercise Physiologists (ASEP) ISSN 1097-975 Diet and Recovery Nutrition and Exercise Dietary Carbohydrate and Protein Manipulation and Exercise Recovery in Novice Weight-Lifters LYONEL BENJAMIN 1 , PETER BLANPIED 2 , LINDA LAMONT 1 1 Energy Metabolism Laboratory, Department of Kinesiology/Exercise Science Program, University of Rhode Island, Kingston, Rhode Island, USA 2 Physical Therapy Department, University of Rhode Island, Kingston, Rhode Island, USA. ABSTRACT Benjamin L, Blanpied P, Lamont LS . Dietary Carbohydrate and Protein Manipulation and Exercise Recovery in Novice Weight-Lifters. JEP online 2009;12 (6):33-39. The influence of nutritional status on recovery from exercise-induced muscle damage is poorly understood. Co-ingestion of carbohydrate with ample protein during the first 6 hours of recovery did not augment protein synthesis. Also acutely increasing carbohydrate intake (48-hrs prior to eccentric exercise) had no recovery effect. The purpose of this study was to evaluate 5-days of a dietary carbohydrate/protein manipulation on markers of exercise-induced muscle damage, soreness, and function as well as markers of whole- body protein metabolism. Subjects were randomly assigned to a low carbohydrate (3.4 g/kg), higher protein diet (1.5 g/kg = LOW) or a high carbohydrate (5.0 g/kg), lower protein diet (1.2 g/kg = HIGH). Both diets exceeded the protein RDA. After eccentric exercise muscle soreness, CK, isometric strength, nitrogen retention, and whole-body protein metabolism were determined. LOW had a greater strength loss and lower CK (p < 0.04) after exercise when compared with HIGH. LOW also had a reduced protein turnover, synthesis, and breakdown during recovery (p < 0.01). These findings indicate that dietary carbohydrate, as opposed to protein, may be a more important nutrient to the novice weight lifter when recovering from eccentric exercise-induced muscle damage. Key Words : [ 15 N] Glycine, Muscle Damage, Protein Metabolism, Creatine Kinase, Resistance Exercise. INTRODUCTION 33
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Diet and Recovery Eccentric contractions occur when a muscle is generating tension while elongating. Eccentric exercise-induced muscle damage has been characterized by structural protein damage in both muscle and connective tissue (1, 2). Any exercise with an eccentric component can be associated with muscle damage and this will be followed by an inflammatory response, necrosis, and the regeneration of new tissue. Also, the increased proteolysis causes a demand for nitrogen and energy to rebuild new muscle tissue (3). Although nutrition plays a major role in providing energy and
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