Muscular and systemic correlates of resistance training-induced muscle hypertrophy

To determine relationships between post-exercise changes in systemic [testosterone, growth hormone (GH), insulin like grow factor 1 (IGF-1) and interleukin 6 (IL-6)], or intramuscular [skeletal muscle androgen receptor (AR) protein content and p70S6K phosphorylation status] factors in a moderately-s...

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Veröffentlicht in:PloS one 2013-10, Vol.8 (10), p.e78636-e78636
Hauptverfasser: Mitchell, Cameron J, Churchward-Venne, Tyler A, Bellamy, Leeann, Parise, Gianni, Baker, Steven K, Phillips, Stuart M
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creator Mitchell, Cameron J
Churchward-Venne, Tyler A
Bellamy, Leeann
Parise, Gianni
Baker, Steven K
Phillips, Stuart M
description To determine relationships between post-exercise changes in systemic [testosterone, growth hormone (GH), insulin like grow factor 1 (IGF-1) and interleukin 6 (IL-6)], or intramuscular [skeletal muscle androgen receptor (AR) protein content and p70S6K phosphorylation status] factors in a moderately-sized cohort of young men exhibiting divergent resistance training-mediated muscle hypertrophy. Twenty three adult males completed 4 sessions•wk⁻¹ of resistance training for 16 wk. Muscle biopsies were obtained before and after the training period and acutely 1 and 5 h after the first training session. Serum hormones and cytokines were measured immediately, 15, 30 and 60 minutes following the first and last training sessions of the study. Mean fiber area increased by 20% (range: -7 to 80%; P
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Twenty three adult males completed 4 sessions•wk⁻¹ of resistance training for 16 wk. Muscle biopsies were obtained before and after the training period and acutely 1 and 5 h after the first training session. Serum hormones and cytokines were measured immediately, 15, 30 and 60 minutes following the first and last training sessions of the study. Mean fiber area increased by 20% (range: -7 to 80%; P&lt;0.001). Protein content of the AR was unchanged with training (fold change = 1.17 ± 0.61; P=0.19); however, there was a significant correlation between the changes in AR content and fiber area (r=0.60, P=0.023). Phosphorylation of p70S6K was elevated 5 hours following exercise, which was correlated with gains in mean fiber area (r=0.54, P=0.007). There was no relationship between the magnitude of the pre- or post-training exercise-induced changes in free testosterone, GH, or IGF-1 concentration and muscle fiber hypertrophy; however, the magnitude of the post exercise IL-6 response was correlated with muscle hypertrophy (r=0.48, P=0.019). Post-exercise increases in circulating hormones are not related to hypertrophy following training. Exercise-induced changes in IL-6 correlated with hypertrophy, but the mechanism for the role of IL-6 in hypertrophy is not known. Acute increases, in p70S6K phosphorylation and changes in muscle AR protein content correlated with muscle hypertrophy implicating intramuscular rather than systemic processes in mediating hypertrophy.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0078636</identifier><identifier>PMID: 24130904</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Adult ; Androgen receptors ; Androgens ; Cohort Studies ; Correlation ; Cytokines ; Ethics ; Exercise ; Gene expression ; Growth hormone ; Growth Hormone - blood ; Growth hormones ; Hormones ; Hormones - blood ; Humans ; Hypertrophy ; Hypertrophy - blood ; Hypertrophy - etiology ; Hypertrophy - pathology ; Insulin ; Insulin-like growth factor I ; Insulin-Like Growth Factor I - analysis ; Interleukin ; Interleukin 6 ; Interleukin-6 - blood ; Interleukins ; Kinesiology ; Male ; Males ; Medical screening ; Metabolism ; Muscle, Skeletal - metabolism ; Muscle, Skeletal - pathology ; Muscles ; Musculoskeletal system ; Phosphorylation ; Physical fitness ; Physical training ; Protein folding ; Protein synthesis ; Proteins ; Receptors, Androgen - analysis ; Receptors, Androgen - metabolism ; Resistance training ; Resistance Training - adverse effects ; Ribosomal Protein S6 Kinases, 70-kDa - metabolism ; Skeletal muscle ; Somatotropin ; Strength training ; Testosterone ; Testosterone - blood ; Training ; Weight Lifting ; Weight training ; Young Adult</subject><ispartof>PloS one, 2013-10, Vol.8 (10), p.e78636-e78636</ispartof><rights>COPYRIGHT 2013 Public Library of Science</rights><rights>2013 Mitchell et al. 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Academic</collection><collection>PubMed Central (Full Participant titles)</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>PloS one</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mitchell, Cameron J</au><au>Churchward-Venne, Tyler A</au><au>Bellamy, Leeann</au><au>Parise, Gianni</au><au>Baker, Steven K</au><au>Phillips, Stuart M</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Muscular and systemic correlates of resistance training-induced muscle hypertrophy</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2013-10-09</date><risdate>2013</risdate><volume>8</volume><issue>10</issue><spage>e78636</spage><epage>e78636</epage><pages>e78636-e78636</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>To determine relationships between post-exercise changes in systemic [testosterone, growth hormone (GH), insulin like grow factor 1 (IGF-1) and interleukin 6 (IL-6)], or intramuscular [skeletal muscle androgen receptor (AR) protein content and p70S6K phosphorylation status] factors in a moderately-sized cohort of young men exhibiting divergent resistance training-mediated muscle hypertrophy. Twenty three adult males completed 4 sessions•wk⁻¹ of resistance training for 16 wk. Muscle biopsies were obtained before and after the training period and acutely 1 and 5 h after the first training session. Serum hormones and cytokines were measured immediately, 15, 30 and 60 minutes following the first and last training sessions of the study. Mean fiber area increased by 20% (range: -7 to 80%; P&lt;0.001). Protein content of the AR was unchanged with training (fold change = 1.17 ± 0.61; P=0.19); however, there was a significant correlation between the changes in AR content and fiber area (r=0.60, P=0.023). Phosphorylation of p70S6K was elevated 5 hours following exercise, which was correlated with gains in mean fiber area (r=0.54, P=0.007). There was no relationship between the magnitude of the pre- or post-training exercise-induced changes in free testosterone, GH, or IGF-1 concentration and muscle fiber hypertrophy; however, the magnitude of the post exercise IL-6 response was correlated with muscle hypertrophy (r=0.48, P=0.019). Post-exercise increases in circulating hormones are not related to hypertrophy following training. Exercise-induced changes in IL-6 correlated with hypertrophy, but the mechanism for the role of IL-6 in hypertrophy is not known. Acute increases, in p70S6K phosphorylation and changes in muscle AR protein content correlated with muscle hypertrophy implicating intramuscular rather than systemic processes in mediating hypertrophy.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>24130904</pmid><doi>10.1371/journal.pone.0078636</doi><tpages>e78636</tpages><oa>free_for_read</oa></addata></record>
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subjects Adult
Androgen receptors
Androgens
Cohort Studies
Correlation
Cytokines
Ethics
Exercise
Gene expression
Growth hormone
Growth Hormone - blood
Growth hormones
Hormones
Hormones - blood
Humans
Hypertrophy
Hypertrophy - blood
Hypertrophy - etiology
Hypertrophy - pathology
Insulin
Insulin-like growth factor I
Insulin-Like Growth Factor I - analysis
Interleukin
Interleukin 6
Interleukin-6 - blood
Interleukins
Kinesiology
Male
Males
Medical screening
Metabolism
Muscle, Skeletal - metabolism
Muscle, Skeletal - pathology
Muscles
Musculoskeletal system
Phosphorylation
Physical fitness
Physical training
Protein folding
Protein synthesis
Proteins
Receptors, Androgen - analysis
Receptors, Androgen - metabolism
Resistance training
Resistance Training - adverse effects
Ribosomal Protein S6 Kinases, 70-kDa - metabolism
Skeletal muscle
Somatotropin
Strength training
Testosterone
Testosterone - blood
Training
Weight Lifting
Weight training
Young Adult
title Muscular and systemic correlates of resistance training-induced muscle hypertrophy
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