Key result
Venular hemoglobin oxygen saturation was higher in spontaneously hypertensive rats than in normotensive rats after 4-Hz (52.0% vs 43.0%) and 8-Hz (51.0% vs 41.0%) muscle contractions.
Population
Spontaneously hypertensive rats (SHR) and normotensive Wistar-Kyoto rats
Comparison
Muscle contractions (2 Hz, 4 Hz, and 8 Hz) vs Normotensive Wistar-Kyoto rats and resting state
Design
Preclinical
Authors
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Hypothesis-generating for microvascular oxygen mismatch in hypertension; leaves open translation to human exercise physiology.
Absolute Event Rate: 52% vs 43%
In spontaneously hypertensive rats, an excess in oxygen delivery occurs relative to oxygen use during muscle contractions, suggesting oxygen exchange may be limited by decreased capillary density, shunting, or decreased transit time.
Lash et al. (1995) studied Hypertension (Spontaneously hypertensive rats). Muscle contractions vs. Normotensive Wistar-Kyoto rats was evaluated on Venular hemoglobin oxygen saturation after 4-Hz contractions. Venular hemoglobin oxygen saturation was higher in spontaneously hypertensive rats than in normotensive rats after 4-Hz (52.0% vs 43.0%) and 8-Hz (51.0% vs 41.0%) muscle contractions.
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