The effects of 8 weeks of whey or rice protein supplementation on body composition and exercise performance

Nutrition Journal

Research

Joshua E Dudeck¹  Jacob M Wilson¹  Ryan P Lowery¹  Jordan M Joy²  Douglas S Kalman³  Stephanie MC Wilson⁴  Martin Purpura⁵  Ralf Jäger⁵  Eduardo O De Souza⁶ 

[1] Department of Health Sciences and Human Performance, The University of Tampa, 33606, Tampa, FL, USA;Department of Health Sciences and Human Performance, The University of Tampa, 33606, Tampa, FL, USA;College of Professional Studies, North-eastern University, 02115, Boston, MA, USA;Department of Nutrition and Endocrinology, Miami Research Associates, Miami, FL, USA;Department of Nutrition, IMG Performance Institute, IMG Academies, Bradenton, FL, USA;Increnovo LLC, 2138 E Lafayette Pl, 53202, Milwaukee, WI, USA;Laboratory of Neuromuscular Adaptations to Strength Training, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil;

关键词: Protein Quality;    Leucine;    Whey;    Rice;   

DOI  :  10.1186/1475-2891-12-86

 received in 2013-03-07, accepted in 2013-06-17,  发布年份 2013

来源: Springer

【 摘 要 】

ndConsumption of moderate amounts of animal-derived protein has been shown to differently influence skeletal muscle hypertrophy during resistance training when compared with nitrogenous and isoenergetic amounts of plant-based protein administered in small to moderate doses. Therefore, the purpose of the study was to determine if the post-exercise consumption of rice protein isolate could increase recovery and elicit adequate changes in body composition compared to equally dosed whey protein isolate if given in large, isocaloric doses.Methods24 college-aged, resistance trained males were recruited for this study. Subjects were randomly and equally divided into two groups, either consuming 48 g of rice or whey protein isolate (isocaloric and isonitrogenous) on training days. Subjects trained 3 days per week for 8 weeks as a part of a daily undulating periodized resistance-training program. The rice and whey protein supplements were consumed immediately following exercise. Ratings of perceived recovery, soreness, and readiness to train were recorded prior to and following the first training session. Ultrasonography determined muscle thickness, dual emission x-ray absorptiometry determined body composition, and bench press and leg press for upper and lower body strength were recorded during weeks 0, 4, and 8. An ANOVA model was used to measure group, time, and group by time interactions. If any main effects were observed, a Tukey post-hoc was employed to locate where differences occurred.ResultsNo detectable differences were present in psychometric scores of perceived recovery, soreness, or readiness to train (p > 0.05). Significant time effects were observed in which lean body mass, muscle mass, strength and power all increased and fat mass decreased; however, no condition by time interactions were observed (p > 0.05).ConclusionBoth whey and rice protein isolate administration post resistance exercise improved indices of body composition and exercise performance; however, there were no differences between the two groups.

【 授权许可】

Unknown   
© Joy et al.; licensee BioMed Central Ltd. 2013. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.