Evaluation of autonomic nervous system responses during isometric handgrip exercise using nonlinear analysis of heart rate variability.
Yusuke Fukumoto, Yoshihiro Tsuji, Akihiro Kakuda and 4 others
PMID 36213191WHAT IT FOUND
In 15 healthy young adults, autonomic responses to handgrip exercise did not differ between 30% and 50% of maximum strength.
Pulse rate rose and heart rhythm regularity increased during gripping regardless of intensity, with no interaction effect.
Key findings
01There was no significant difference in autonomic responses between the two exercise intensities, as indicated by the lack of effect for the exercise intensity factor and no interaction between timing and intensity.
02Pulse rate increased significantly during the exercise task compared to before and after, regardless of whether the grip was at 30% or 50% of maximum voluntary contraction.
03Approximate Entropy (ApEn) decreased significantly during the exercise task compared to before and after, indicating a more regular pulse wave, regardless of exercise intensity.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study only included 15 healthy young adults, so the results may not apply to older adults or those with cardiovascular conditions. Participants did not have chronic pain, so it is unknown if patients with pain would respond similarly to the different intensities. The small sample size limits the generalizability of the findings. Factors such as sex, menstrual cycle, diet, and physical activity levels were not fully controlled or analyzed.
Declared interests
The authors declared no funding was received and no conflicts of interest.
The easy way to misread this
Do not assume these findings apply to patients with chronic pain or older adults. The study was conducted on healthy young students, and the authors explicitly state that autonomic responses in those other groups remain unknown.