Tell me more about HRV and its importance.

HRV (heart rate variability) measures how much the time between successive heartbeats varies. It reflects how flexibly the autonomic nervous system regulates the heart, and can offer clues about stress and recovery. 1 2

• Higher versus lower HRV: Higher HRV generally corresponds to being more rested and recovered, with greater parasympathetic influence; lower HRV can indicate greater stress and a more activated, “wired” state. 3
• Beyond resting heart rate: Resting heart rate can rise with substantial stress, but it may miss smaller stressors such as hard training. HRV is described as a more useful marker of overall stress and recovery. 4 3
• Mental health and sleep: HRV is associated with positive mental-health outcomes, including lower anxiety, improved sleep, and better overall mood. 5
• Breathing and HRV: Inhaling tends to speed the heart rate, while exhaling slows it through vagal pathways. Longer or more vigorous exhales can increase parasympathetic activity and help raise HRV. 6 7
• Habits that support HRV: Regular cardiovascular and resistance exercise, sufficient quality sleep, and listening to enjoyable music for a dedicated period can support higher HRV. 8 9