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The mechanisms of increased insulin sensitivity in rat skeletal muscle following low-intensity prolonged exercise

Research Project

Project/Area Number 18500518
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Sports science
Research InstitutionNiigata University of Health and Welfare

Principal Investigator

KAWANAKA Kentaro  Niigata University of Health and Welfare, Health Science, Associate professor (80339960)

Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥4,200,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥600,000)
Fiscal Year 2007: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2006: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywordsglucose uptake / swimming / treadmill / epitrochlearis / soleus / Sirtl / lactate threshold / 乳酸性作業閾値 / 骨格筋 / AMPK
Research Abstract

Exercise increases insulin sensitivity of glucose uptake in skeletal muscles. However, the constituent (duration, intensity, volume) of exercise which determines post-exercise insulin sensitivity is uncertain. The mechanism(s) of exercise-induced increase in muscle insulin sensitivity is also not clear.
We examined the effects of low-intensity prolonged swimming (LIS; 3h) or high-intensity short-term swimming (HIS; 160 sec) on rat fast-twitch epitrochlearis muscle. Although both LIS and HIS increased muscle insulin sensitivity as compared with resting control, LIS which intensity (50% VO2max) is around lactate threshold increased muscle insulin sensitivity to higher level than HIS which intensity (140% VO2max) is far above lactate threshold. Thus, it is suggested that total volume of exercise is important determinant of post-exercise insulin sensitivity.
Furthermore, in our present study, we exercised rats for 90-360min by treadmill at 6m/min or 9m/min and examined post-exercise insulin … More sensitivity in slow-twitch soleus muscle. The intensity of these treadmill walking is less than lactate threshold. Treadmill walking at 9m/min, but not at 6m/min, enhanced insulin sensitivity in rat slow-twitch soleus muscle. Thus, very low-intensity exercise which intensity is less than lactate threshold can increase muscle insulin sensitivity. However, it is probable that minimum exercise intensity is required for increasing post-exercise insulin sensitivity in rat slow-twitch soleus muscle.
In our present study, LIS but not HIS increased Sirt1 mRNA expression in rat epitrochlearis muscle. Therefore, it is likely that Sirt1 gene expression in skeletal muscle increases in accordance with the increase in exercise volume. Since Sirt1 is known to regulate muscle insulin signaling, it is possible that LIS-induced enhancement of muscle insulin sensitivity is mediated by increased Sirt1 gene expression. Furthermore, we found that increased gene expression of Sirt1 occurred in skeletal muscles recruited during exercise. Thus, exercise-induced increase in Sirt1 gene expression is mainly due to muscle contractile activity. Less

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (6 results)

All 2008 2007 2006

All Journal Article (2 results) (of which Peer Reviewed: 1 results) Presentation (4 results)

  • [Journal Article] Effect of high-intensity intermittent swimming on postexercise insulin sensitivity in rat epitrochlearis muscle2008

    • Author(s)
      Koshinaka K., Sano A., Kawanaka K.(他4名)
    • Journal Title

      Metabolism 57

      Pages: 749-755

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Effect of high-intensity intermittent swimming on postexercise insulin sensitivity in rat epitrochlearis muscle.2008

    • Author(s)
      Koshinaka, K., Sano, A., Howlett, K. F., Yamazaki, T., Sasaki, M., Sakamoto, K., Kawanaka, K.
    • Journal Title

      Metabolism. 57

      Pages: 749-756

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 低強度運動がラットヒラメ筋の糖取り込みに及ぼす影響2007

    • Author(s)
      佐々木 万衣子、川中 健太郎(他2名)
    • Organizer
      日本体力医学会
    • Place of Presentation
      秋田
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] 運動がラット骨格筋のSirt1遺伝子発現に及ぼす影響2007

    • Author(s)
      保苅 芙美、佐々木 万衣子、川中 健太郎
    • Organizer
      日本体力医学会
    • Place of Presentation
      秋田
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] Effects of low and high-intensity swimming on post-exercise insulin sensitivity in rat skeletal muscle2006

    • Author(s)
      Keiichi Koshinaka, Akiko Sano, Kentaro Kawanaka
    • Organizer
      American Diabetes Association 66th Scientific Sessions
    • Place of Presentation
      米国ワシントンDC
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Effect of low and high-intensity swimming on Post-exercise insulin sensitivity in rat skeletal muscle2006

    • Author(s)
      Koshinaka, K., Sano, A., Kawanaka, K.
    • Organizer
      American Diabetes Association Scientific Sessions
    • Place of Presentation
      Washington DC
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2006-04-01   Modified: 2016-04-21  

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