Heart rate acceleration precedes spontaneous movement in sleep by about 8 seconds, suggesting it is triggered by internal arousal stimuli rather than vascular congestion.
HR changes may precede sleep movements without altering monitoring; leaves open arousal mechanisms in observational data.
Spontaneous movements in both stage 2 and REM steep are preceded by similar heart rate increase, beginning approximately 8 sec before onset the movement. It is suggested that the HR acceleration before spontaneous movement in sleep is not a gradual response to vascular congestion but, rather, may be triggered by internal arousal stimuli which, like movements, have sleep‐stage‐specific rules of occurrence.
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Townsend et al. (1975) studied this question.
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