Autonomic modulation in resistance-trained individuals after acute resistance exercise

Area of Science:

• Exercise Physiology
• Autonomic Nervous System Function

Background:

• The impact of acute resistance exercise on autonomic modulation remains unclear, particularly when comparing resistance-trained and untrained individuals.
• Understanding these effects is crucial for optimizing training and recovery protocols.

Purpose of the Study:

• To investigate the effects of different acute resistance exercise modalities on autonomic modulation.
• To compare these effects between resistance-trained and untrained individuals.

Main Methods:

• Seventeen resistance-trained and 17 untrained participants underwent assessments of autonomic modulation.
• Electrocardiogram (ECG) data were collected at rest and post-exercise (whole-body, lower-body, upper-body resistance exercise, and control).
• Heart rate variability and heart rate complexity (Sample Entropy) were analyzed.

Main Results:

• No significant differences in resting autonomic modulation were observed between groups.
• All acute resistance exercise bouts led to significant decreases in parasympathetic modulation.
• The resistance-trained group exhibited significant decreases in Sample Entropy after whole-body and upper-body exercise, unlike the untrained group.

Conclusions:

• Resistance exercise training appears to attenuate parasympathetic responses to acute bouts of resistance exercise.
• This attenuation occurs irrespective of the exercise modality, suggesting a training-induced adaptation in autonomic control.
• Further research is needed to explore the long-term implications of these findings.