<Originals>Effects of Running Training and Hypovolemia on LBNP Tolerance

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概要

• 論文の詳細を見る

• LOEPPLY, Jacl. A., MYHRE, Loren, G., VENTERS, Michael, D., ICENOGLE, Milton, V. and KOBAYASHI, Y. Effects of Running Training and Hypovolemia on LBNP Tolerance. Adv. Exerc. Sports Physiol., Vol.11, No.2 pp69-76, 2005. Studies on astronauts indicated that running training and volume depletion reduced post-flight orthostatic tolerance. LBNP tolerance (TOL) studies were undertaken with the purpose of confirming this influence of running training and volume depletion by exercising in dry heat (EH) and lasix diuresis and EH acclimation. Tol was measered in 5 running-trained (RT) and 5 non-trained (NT) men before and after acute EH for 2 hr at 30% of maximal O2 uptale (VO2max), increasing body temperature by 1.0℃, reducing body water by 4.3% and plasma volume (PV) by 13%. Tests were repeated after 8 days of EH acclimation. Another 5 RT and 5 NT were tested under LBNP before and after acute lasix diuresis, reducing body water by 4.1% and PV by 17%. TOL was always lower in RT who exhibited significantly higher intra- and extra- cascular leg compliance and less efficient baroreceptor HR response. The relationship betwwen VO2max and TOL was not significant (n=20, r=-0.37, p=0.13). TOL was significantly reduced by lasix and EH and improved by EH acclimation in dehydrated subjects, in parallel with a reduction in intravascular conpliance. Acute EH and lasix reduced TOL by volume depletion so that superimposed fluid displacement and imprived PV conservation during EH, but not during LBNP. In this study PT was correlated with reduced TOL was associated with greater intravascular leg compliance and ineffective baroreflex response, especially in RT, and improved TOL with EH acclimation was related to a reduetion in leg compliance.

• 日本運動生理学会の論文

著者

• Kobayashi Yoshio

  The Laboratory for Health and Human Performance School of Arts and Sciences, Chukyo University

• Loeppky Jack

  Cardiology Section Va Medical Center

• Myhre Loren

  Nike Inc.

• MYHRE Loren

  Nike, Inc.

• ICENOGLE Milton

  Cardiology Section, VA Medical Center

• Icenogle Milton

  Cardiology Section Va Medical Center

• Kobayashi Yoshio

  The Laboratory For Health And Human Performance School Of Arts And Sciences Chukyo University

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• Effects of Running Training and Hypovolemia on LBNP Tolerance

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