Sinus arrhythmia in man at rest.
D000328:Adult; D001146:Arrhythmia, Sinus / Q000503:physiopathology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008168:Lung / Q000502:physiology; D011187:Posture; D012119:Respiration / Q000502:physiology*; D012146:Rest; D013637:Tape Recording