Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
 
FIND ARTICLES

jssm
jssm

Journal of Sports Science and Medicine
ISSN: 1303 - 2968
       SCImago 2015     SJR: 0.682   Cites per Doc. 2-Year: 1.61    3-Year: 1.72
JCReports 2016
    IF 2-Year: 1.797    3-Year: 1.970    5-Year: 2.061    Average Citations PI: 7.7
 
©Journal of Sports Science and Medicine (2016) 15, 17 - 25
Research article
Daily Overfeeding from Protein and/or Carbohydrate Supplementation for Eight Weeks in Conjunction with Resistance Training Does not Improve Body Composition and Muscle Strength or Increase Markers Indicative of Muscle Protein Synthesis and Myogenesis in Resistance-Trained Males
Mike Spillane1, Darryn S. Willoughby2,

1 Department of Health, Physical Education, and Leisure Studies, University of South Alabama, Mobile, AL, USA
2 Department of Health, Human Performance, and Recreation, Exercise and Biochemical, Nutrition Laboratory, Baylor University, Waco, TX, USA

Darryn S. Willoughby
✉ Department of Health, Human Performance, and Recreation, Baylor University, 1312 South 5th Street, Waco, TX 76798, USA
Email: darryn_willoughby@baylor.edu

Received:
25-09-2015 -- Accepted: 11-11-2015 --
Published (online): 23-02-2016

ABSTRACT

This study determined the effects of heavy resistance training and daily overfeeding with carbohydrate and/or protein on blood and skeletal muscle markers of protein synthesis (MPS), myogenesis, body composition, and muscle performance. Twenty one resistance-trained males were randomly assigned to either a protein + carbohydrate [HPC (n = 11)] or a carbohydrate [HC (n = 10)] supplement group in a double-blind fashion. Body composition and muscle performance were assessed, and venous blood samples and muscle biopsies were obtained before and after eight weeks of resistance training and supplementation. Data were analyzed by two-way ANOVA (p ≤ 0.05). Total body mass, body water, and fat mass were significantly increased in both groups in response to resistance training, but not supplementation (p < 0.05); however, lean mass was not significantly increased in either group (p = 0.068). Upper- (p = 0.024) and lower-body (p = 0.001) muscle strength and myosin heavy chain (MHC) 1 (p = 0.039) and MHC 2A (p = 0.027) were also significantly increased with resistance training. Serum IGF-1, GH, and HGF were not significantly affected (p > 0.05). Muscle total DNA, total protein, and c-Met were not significantly affected (p > 0.05). In conjunction with resistance training, the peri-exercise and daily overfeeding of protein and/or carbohydrate did not preferentially improve body composition, muscle performance, and markers indicative of MPS and myogenic activation.

Key words: Protein, carbohydrate, muscle strength, hypertrophy, muscle protein synthesis, myogenesis
Key Points
In response to 56 days of heavy resistance training and HC or HPC supplementation, similar increases in muscle mass and strength in both groups occurred; however, the increases were not different between supplement groups.
The supplementation of HPC had no preferential effect on augmenting serum IGF-1 GH, or HGF.
The supplementation of HPC had no preferential effect on augmenting increases in total muscle protein content or the myogenic markers, total DNA and muscle cMet content.
In response to 56 days of a daily supplemental dose of 94 g of protein and 196 g of carbohydrate, the HPC group was no more effective than 312 g of carbohydrate in the HC group in increasing muscle strength and mass due to its ability to elevate serum anabolic hormones and growth factors and markers of myogenic activation of satellite cells.

 


  

Article Tools
How to Cite
Citations in ScholarGoogle 
Email link to this article
Mike Spillane, Darryn S. Willoughby, (2016) Daily Overfeeding from Protein and/or Carbohydrate Supplementation for Eight Weeks in Conjunction with Resistance Training Does not Improve Body Composition and Muscle Strength or Increase Markers Indicative of Muscle Protein Synthesis and Myogenesis in Resistance-Trained Males. Journal of Sports Science and Medicine (15), 17 - 25.

Your name:

*

Your E-mail:

*
Recipient's E-mail: *
*Required Field
Statistics
Article views from publication date
Abstract :6659
Full-text :5173
Pdf :678
Total :12510
New content alert
 
JSSM | Copyright 2001-2017 | All rights reserved. | LEGAL NOTICES | Publisher
It is forbidden the total or partial reproduction of this web site and the published materials, the treatment of its database, any kind
of transition and for any means, either electronic, mechanic or other methods, without the previous written permission of the JSSM.