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Skeletal Muscle Deoxygenation Responses During Treadmill Exercise in Children

  • Shun Takagi
  • Ryotaro Kime
  • Taishi Midorikawa
  • Masatsugu Niwayama
  • Shizuo Sakamoto
  • Toshihito Katsumura
Conference paper
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 812)

Abstract

Muscle O2 saturation (SmO2) and blood volume response in activating muscles during treadmill exercise were compared between prepubertal boys (n = 9, age: 9 ± 1 years) and young men (n = 9, age: 22 ± 2 years). SmO2 and blood volume responses were monitored continuously during the exercise at the gastrocnemius medialis muscle by near infrared spatial resolved spectroscopy. SmO2 was significantly decreased only at peak exercise in the boys, even though a significant decrease in SmO2 was observed at 60, 80, and 100 % of peak O2 uptake in the men (p < 0.05). No significant increase in blood volume was observed in the boys, while blood volume was significantly increased in the men with increased exercise intensity (p < 0.05). These results suggest that both blood volume and deoxygenation response in activating muscle may be minor in prepubertal boys, compared to young men. The blunted deoxygenation response in prepubertal boys may be caused by undeveloped diffusive O2 transport (i.e. mitochondrial respiration).

Keywords

Blood volume Muscle oxygen saturation Near-infrared spatial resolved spectroscopy Prepubertal boys Young men 

Notes

Acknowledgments

The authors are grateful for revision of this manuscript by Andrea Hope. We also thank Masayuki Konishi and Hiroki Tabata (Waseda University, Japan) for their helpful technical assistance.

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Copyright information

© Springer Science+Business Media, LLC 2014

Authors and Affiliations

  • Shun Takagi
    • 1
  • Ryotaro Kime
    • 1
  • Taishi Midorikawa
    • 2
  • Masatsugu Niwayama
    • 3
  • Shizuo Sakamoto
    • 4
  • Toshihito Katsumura
    • 1
  1. 1.Department of Sports Medicine for Health PromotionTokyo Medical UniversityTokyoJapan
  2. 2.College of Health and WelfareJ. F. Oberlin UniversityMachida, TokyoJapan
  3. 3.Department of Electrical and Electronic EngineeringShizuoka UniversityHamamatsuJapan
  4. 4.Faculty of Sport SciencesWaseda UniversityTokorozawaJapan

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