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Left ventricular hemodynamics during exercise recovery.

E C Johnson1, T L Hudson, E R Greene

  • 1Biomedical Research Division, Lovelace Medical Foundation, Albuquerque, New Mexico 87108.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 1, 1990
PubMed
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Posture significantly impacts left ventricular stroke volume recovery after exercise. Supine recovery shows a higher stroke index compared to seated recovery, influencing cardiac patient stress testing protocols.

Area of Science:

  • Cardiovascular Physiology
  • Exercise Science

Background:

  • The recovery pattern of left ventricular stroke volume post-exercise is not fully understood.
  • Conflicting reports suggest stroke volume may increase or decrease during early recovery.
  • Posture is a potential confounding factor in previous studies.

Purpose of the Study:

  • To investigate the effect of posture on stroke index (SI) during passive recovery from seated exercise.
  • To test the hypothesis that seated and supine recovery positions yield different stroke index values.

Main Methods:

  • Pulsed Doppler ultrasound was used to measure stroke index (SI).
  • Thirteen healthy subjects underwent two seated ergometer exercise tests.
  • Recovery was assessed in both supine and seated postures.

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Main Results:

  • Resting stroke index and cardiac index were significantly lower in the seated position compared to supine.
  • During recovery, supine SI peaked at 22-29% above resting and exercise levels.
  • Seated SI remained at peak exercise levels for 2 minutes; recovery cardiac index did not exceed exercise values in either posture.

Conclusions:

  • Posture significantly influences stroke index during recovery from submaximal seated exercise.
  • Findings suggest implications for selecting recovery postures in cardiac stress testing to minimize ventricular loading.