Low voltage on an EKG is usually encountered in people with very thick chest walls or with lung diseases. Low voltage results from increased impedance between the EKG leads (on the chest) and the source of the charge (the heart). Increased distance, poorly conducting tissue or air all increase the impedance, thus resulting in decreased voltage visible on the EKG.
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Low metabolic rate (hibernation) requires low O2 consumption, which requires low cardiac output, which results in low heart rate.
There is no evidence that low frequency sounds affect the heart.
stroke
Low blood pressure or low oxygen saturation (%).