Ultra-short-term heart rate variability during resistance exercise in the elderly.

Area of Science:

• Exercise Physiology
• Cardiovascular Health
• Gerontology

Background:

• Ultra-short-term heart rate variability (HRV) analysis, using R-R interval (RRi) recordings under 5 minutes, is underutilized and lacks validation during exercise.
• Specifically, its applicability during resistance exercise remains unestablished.

Purpose of the Study:

• To compare ultra-short-term HRV analysis with standard short-term HRV analysis.
• To assess the reliability of ultra-short-term HRV during low-intensity, dynamic, lower limb resistance exercise in healthy elderly subjects.

Main Methods:

• Collected heart rate (HR) and RRi signals from 9 healthy elderly men during incremental resistance exercise (10-35% of 1-RM).
• Segmented RRi signals into 1-, 2-, and 3-minute sections for analysis.
• Analyzed HRV using time-domain (RMSSD, SDNN, pNN50) and non-linear (SD1, SD2) parameters.

Main Results:

• No significant differences were found between ultra-short-term and standard short-term HRV analysis results across all exercise intensities.
• Excellent to near-perfect concordance was observed between HRV parameters calculated from 1- and 2-minute segments and those from 3-minute segments.

Conclusions:

• Ultra-short-term HRV analysis is a dependable surrogate for standard short-term HRV analysis during resistance exercise in healthy elderly individuals.
• This finding supports the use of brief HRV recordings in clinical and research settings for this population during exercise.