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.
| Original language | English |
|---|---|
| Pages (from-to) | 160-167 |
| Number of pages | 8 |
| Journal | Journal of Applied Physiology |
| Volume | 85 |
| Issue number | 1 |
| Publication status | Published - 1998 |
| Externally published | Yes |
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Keywords
- Exercise
- Lower body positive pressure
- Mean arterial blood pressure
- Muscle mechanoreflex
- Muscle metaboreflex
- Upright
ASJC Scopus subject areas
- Physiology
- Endocrinology
- Orthopedics and Sports Medicine
- Physical Therapy, Sports Therapy and Rehabilitation
Cite this
Effects of posture on cardiovascular responses to lower body positive pressure at rest and during dynamic exercise. / Nishiyasu, Takeshi; Nagashima, Kei; Nadel, Ethan R.; Mack, Gary W.
In: Journal of Applied Physiology, Vol. 85, No. 1, 1998, p. 160-167.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of posture on cardiovascular responses to lower body positive pressure at rest and during dynamic exercise
AU - Nishiyasu, Takeshi
AU - Nagashima, Kei
AU - Nadel, Ethan R.
AU - Mack, Gary W.
PY - 1998
Y1 - 1998
N2 - 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.
AB - 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.
KW - Exercise
KW - Lower body positive pressure
KW - Mean arterial blood pressure
KW - Muscle mechanoreflex
KW - Muscle metaboreflex
KW - Upright
UR - http://www.scopus.com/inward/record.url?scp=7344243178&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=7344243178&partnerID=8YFLogxK
M3 - Article
VL - 85
SP - 160
EP - 167
JO - Journal of Applied Physiology Respiratory Environmental and Exercise Physiology
JF - Journal of Applied Physiology Respiratory Environmental and Exercise Physiology
SN - 8750-7587
IS - 1
ER -