Polar H9 Heart Rate MonitorKnow Your Body. Support Your Healing. For those living with chronic illness, fatigue, or autoimmune conditions, understanding your body's signals isn't optional it's essential. The Polar H9 Heart Rate Monitor gives you clinical grade heart rate and HRV (Heart Rate Variability) data so you can track how your nervous system, immune system, and energy levels respond day to day. HRV is one of the most powerful biomarkers for monitoring stress load,
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