They think. It probably applies to all exercise to a degree, but maybe isometric is extra.
https://www.sciencealert.com/isometric-exercise-why-this-workout-regime-is-so-good-for-you
Then, once the contraction is relaxed, a sudden surge of blood flows into the blood vessels and muscle. This influx of blood brings more oxygen and (crucially) nitric oxide into the blood vessels – causing them to widen. This in turn reduces blood pressure. Over time, this action will reduce stiffness of the arteries, which may lower blood pressure.
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