Document Detail

Blood Flow Restriction Exercise in Sprinters and Endurance Runners.
MedLine Citation:
PMID:  21795999     Owner:  NLM     Status:  Publisher    
PURPOSE:: We demonstrated that blood flow restriction (BFR) remarkably enhances muscular metabolic stress in resistance exercise, although there is a wide range of individual differences in the responses. It is possible that these differences could be due to training status and muscular physiological characteristics. We investigated intramuscular metabolic responses during lowintensity resistance exercise with BFR between two different types of track athletes. METHODS:: Twelve age-matched male track athletes (sprinter/endurance runner groups, 6/6) were recruited and performed unilateral plantar-flexion (30 repetitions/min). The exercise protocols were as follows: low-intensity exercise (L) at 20% of one repetition maximum (1 RM), highintensity exercise at 65% 1 RM (H) without BFR (1.3 times of systolic blood pressure), and L with BFR (L-BFR) for 2 min, and prolonged exercise time in L-BFR for 3 min (prolonged BFR). Metabolic stress, defined as phosphocreatine and intramuscular pHdecrease and muscle fiber recruitment were evaluated using 31P-magnetic resonance spectroscopy. RESULTS:: Endurance runners showed higher peak oxygen uptake and lower muscle strength than sprinters. Phosphocreatine decreases in endurance runners during exercise with BFR protocols were significantly greater than those in sprinters (P< 0.05, respectively), although those occurring during L were significantly lower than in sprinters (P< 0.05). The changes in intramuscular pH and the incidence of fast-twitch fiber recruitment did not show a statistical difference between the two groups. Phosphocreatine decreases in L-BFR were significantly correlated with peak oxygen uptake (P< 0.05). CONCLUSION:: The effects of low-intensity resistance exercise with BFR are greater in endurance runners according to higher aerobic capacity.
Shingo Takada; Koichi Okita; Tadashi Suga; Masashi Omokawa; Noriteru Morita; Masahiro Horiuchi; Tomoyasu Kadoguchi; Masashige Takahashi; Kagami Hirabayashi; Takashi Yokota; Shintaro Kinugawa; Hiroyuki Tsutsui
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-25
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1) Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan; 2) Graduate School of Program in Lifelong Learning Studies, Hokusho University, Ebetsu, Hokkaido, Japan; 3) Northern Regions Lifelong Sports Research Center, Ebetsu, Hokkaido, Japan; 4) Department of Sports Education, Hokkaido University of Education, Iwamizawa, Hokkaido, Japan.
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