Mar 30, 2026Nutrition

GABA and PEA for HRV: Interesting Signals, Thin Evidence

Can GABA or palmitoylethanolamide raise heart rate variability? Two small trials hint at an effect, but exercise and uncertainty complicate the story.

gabapeaheart rate variabilityparasympathetic dominance

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Mar 30, 2026Cardiovascular Health

Can Exercise Restore HRV After Bariatric Surgery?

Bariatric surgery can improve metabolism while cardiac autonomic recovery lags. Four RCTs tested exercise for HRV, but results remain unresolved.

bariatric surgeryautonomic dysfunctionheart rate variabilityparasympathetic tone

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Mar 30, 2026Physical Activity

Exercise, HRV, and Why Training Structure Matters More Than Volume

Can exercise improve HRV? Evidence shows training helps on average, but periodization, intensity, and modality can shape cardiac vagal adaptation and recovery.

heart rate variabilityperiodizationresting rmssdtraining structure

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Mar 30, 2026Cold Exposure

Wim Hof Method RCT Found No Benefit, but Could Not Settle It

The first full Wim Hof Method RCT found no HRV, blood-pressure, vascular, or mood benefit after 15 days. Its design leaves the larger question open.

wim hof methodcold showersheart rate variabilitybreathwork

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Mar 30, 2026Breathwork

Does a Longer Exhale Raise HRV Beyond Slow Breathing?

A longer exhale may raise HRV even at the same breathing rate. What trials show about resonance breathing, vagal tone, and lasting effects.

heart rate variabilityexhale ratiobreathing techniquesparasympathetic

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Mar 24, 2026Wearable Devices

Why Wearable HRV Fails When Movement Matters Most

Consumer PPG wearables can measure HRV well during sleep, but ECG validation shows motion and exercise can corrupt daytime HRV readings.

heart rate variabilitywearable accuracyppg technologyecg measurement

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Mar 22, 2026Sleep

Oura Mindfulness RCT: Better Sleep Scores, Weak Proof

A 10-day Oura mindfulness RCT improved ring-measured sleep and HRV, but a waitlist control and wearable limits fall short of proving a physiological benefit.

mindfulnesssleep efficiencyheart rate variabilityoura ring

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Mar 16, 2026Autonomic Health

Exercise, HRV, and Cancer’s Hidden Autonomic Damage

Cancer treatment can disrupt heart-rate variability and autonomic balance. Exercise may help, but cardio-oncology rehab evidence remains thin.

chemotherapyautonomic nervous systemheart rate variabilityvagal tone

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Mar 15, 2026Physical Activity

Wall Squats Lower Blood Pressure by Different Routes in Men and Women

Wall-squat isometrics can lower systolic blood pressure by 3–6 mmHg. New trial data suggest men and women may get there differently.

isometric resistance exerciseblood pressurewall squatheart rate variability

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