respiratory sinus arrhythmia (resˑ·p
r··tōˈ·rē sīˑ·ns ·rithˑ·mē·),
r··tōˈ·rē sīˑ·ns ·rithˑ·mē·),n the cyclical change in heart rate that occurs in correspondence with breathing rhythm; can be used as an indicator of health. The dampening or absence of RSA may indicate stress or heart damage.
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