Effects of posture on cardiovascular responses to lower body positive pressure at rest and during dynamic exercise

Journal of Applied Physiology
T NishiyasuG W Mack

Abstract

We tested the hypothesis that cardiovascular responses to lower body positive pressure (LBPP) would be dependent on the posture of the subject and also on the background condition (rest or exercise). We measured heart rate (HR), mean arterial blood pressure (MAP), and cardiac stroke volume in eight subjects at rest and during cycle ergometer exercise (76 +/- 3 W) with and without LBPP (25, 50, and 75 mmHg) in the supine and upright positions. At rest, the increase in MAP was proportional to the increase in LBPP and was greater in the supine (6 +/- 2, 15 +/- 3, and 26 +/- 3 mmHg) than in the upright (2 +/- 3, 9 +/- 3, and 17 +/- 3 mmHg) position. During dynamic exercise, the increases in MAP evoked by 25, 50, and 75 mmHg LBPP were greater in the supine (13 +/- 2, 28 +/- 3, and 40 +/- 3 mmHg) than in the upright (7 +/- 3, 12 +/- 3, and 25 +/- 3 mmHg) position. We conclude that the systemic pressure response to LBPP is clearly dependent on the body position, with the larger pressure responses being associated with the supine position both at rest and during dynamic leg exercise.

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Citations

Jan 21, 2000·Journal of Applied Physiology·T NishiyasuG W Mack
Mar 14, 2007·American Journal of Physiology. Heart and Circulatory Physiology·Takeshi NishiyasuMasashi Ichinose
Aug 17, 2001·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Q FuA Suzumura
Feb 25, 2003·Journal of Applied Physiology·W Shane JourneayGlen P Kenny
Aug 18, 2001·Journal of Applied Physiology·J Wu, G W Mack
Jun 5, 2003·Journal of Applied Physiology·Glen P KennyFrancis D Reardon
Jun 5, 2013·American Journal of Physiology. Heart and Circulatory Physiology·Jian CuiLawrence I Sinoway
Nov 17, 2016·Annals of Rehabilitation Medicine·Ka-Young LeeIn-Sung Choi
Feb 27, 2017·European Journal of Applied Physiology·Aurélien BringardGuido Ferretti
May 24, 2011·American Journal of Physiology. Heart and Circulatory Physiology·Masashi IchinoseTakeshi Nishiyasu
Dec 26, 2016·European Journal of Applied Physiology·Matthew David CookMark Elisabeth Theodorus Willems
Mar 23, 2017·European Journal of Applied Physiology·Naoto FujiiTakeshi Nishiyasu
Jun 1, 2007·International Journal of Sports Physiology and Performance·Thomas ZochowskiGordon G Sleivert
Nov 26, 2020·Clinical Physiology and Functional Imaging·Blake G Perry, Toby Mündel
Jun 16, 2014·Journal of Acupuncture and Meridian Studies·Yun-Kyoung Yim, Kwang Suk Park

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