Effects of resistance training on baroreflex sensitivity function in healthy males.
Akira Shōbo
PMID 36213194WHAT IT FOUND
Low-intensity knee extension exercise improved the blood-pressure reflex after exercise in healthy young men.
Medium and high loads did not, despite changes in heart-rate control.
Key findings
01Baroreflex sensitivity was higher after exercise at 20% one-repetition maximum than before exercise.
02Sympathetic activity, measured as LF/HF, was lower after exercise at 20%, 50%, and 80% one-repetition maximum loads.
03Parasympathetic activity, measured as HFnu, was higher after exercise at 20%, 50%, and 80% one-repetition maximum loads.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study included only 27 healthy young men, so it does not show effects in patients with heart failure, hypertension, or older adults. The calculated sample size was 29, but only 27 participants were enrolled. The measurements were taken only for five minutes after each exercise session, so long-term effects were not tested. The study used indirect central hemodynamic measures and did not directly assess peripheral vascular resistance. The authors did not use a clinically objective heart-rate recovery index such as T30. The study tested only one exercise, so it cannot compare resistance training with aerobic training or usual care.
Declared interests
This work was supported by JSPS KAKENHI Grant Number JP18K17731. The author declared no conflicts of interest.
The easy way to misread this
Do not conclude that low-intensity resistance training is proven to improve autonomic function in patients. The study tested 27 healthy young men in single bouts of knee extension exercise, and baroreflex sensitivity improvement was shown only after the 20% one-repetition maximum load.