HIIT Can Delay HRV Recovery. Does Training Time Matter?
HIIT delays HRV recovery more than moderate exercise. A small trial suggests training time may affect heart-rate recovery—but not yet in healthy HIIT users.
Fish Oil and HRV: Why a Slower Pulse Isn’t Better Vagal Tone
Does fish oil improve HRV? Four small RCTs found no consistent placebo-controlled effect, though DHA-rich fish oil can slow resting heart rate in adults.
Does Pre-Workout Caffeine Lower HRV After Exercise?
Pre-workout caffeine does not consistently reduce post-exercise HRV in pooled trials, but strength training and individual responses complicate the answer.