Does resistance exercise facilitate iron and calcium recycle in the body to reduce their requirement?

• Project/Area Number: 24650413
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Sports science
• Research Institution: Osaka University of Health and Sport Sciences
• Principal Investigator: OKAMURA Koji 大阪体育大学, 体育学部, 教授 (10330151)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 鉄 / カルシウム / 運動 / 吸収 / 再利用 / ヘプシジン / 貧血 / 骨 / ミネラル / 鉄欠乏

Outline of Final Research Achievements

This study investigated hypothesis whether resistance exercise training facilitates recycling of iron and calcium in the body and the requirement of these nutrients could be less than thought in athletes whose requirements of these nutrients are regarded high. The results showed that resistance exercise training decreases iron absorption, whereas the iron status maintained due to facilitating iron recycle in the body, suggesting that athletes engaging resistance exercise training might not necessarily increase iron intake. Since bone calcium content, rupture strength and stiffness showed no effect of resistance exercise training, the exercise do not appear to facilitate calcium recycling in the body.

Research Products

• [Journal Article] Effects of resistance exercise on iron absorption and balance in iron-deficient rats. (2014)
  • Author(s): Fujii T, Matsuo T, Okamura K.
  • Journal Title: Biol Trace Elem Res. Volume: 161 Issue: 1 Pages: 101-6
  • DOI: 10.1007/s12011-014-0075-8
  • Peer Reviewed
• [Presentation] Resistance exercise improves the iron status without increasing the iron absorption in iron-deficient rats (2014)
  • Author(s): T Fujii, A Nakashima, C Tanaka, T Matsuo, K Okamura
  • Organizer: Experimental Biology 2014
  • Place of Presentation: San Diego, USA
  • Year and Date: 2014-04-26 – 2014-04-30
• [Presentation] Resistance exercise decreases iron absorption without deteriorating the iron status in rats (2014)
  • Author(s): K Okamura, T Asai, E Kondo, Y Okumura, T Fujii, Matsuo
  • Organizer: Experimental Biology 2014
  • Place of Presentation: San Diego, USA
  • Year and Date: 2014-04-26 – 2014-04-30
• [Presentation] Resistance exercise improves the iron status without increasing the iron absorption in iron-deficient rats (2014)
  • Author(s): Takako Fujii, Ayumi Nakashima, Chihiro Tanaka, Tatsuhiro Matsuo, Koji Okamura
  • Organizer: Experimental Biology 2014
  • Place of Presentation: San Diego Convention Center
• [Presentation] Koji Okamura, Tsuyoshi Asai, Emi Kondo, Yuka Okumura, Takako Fujii, Tatsuhiro Matsuo (2014)
  • Author(s): Resistance exercise decreases iron absorption without deteriorating the iron status in rats
  • Organizer: Experimental Biology 2014
  • Place of Presentation: San Diego Convention Center