Reliability of five-minute versus one-hour heart rate variability metrics in individuals with spinal cord injury
This study evaluated the test-retest reliability of heart rate variability (HRV) measurements in 37 people with spinal cord injury, comparing 5-minute and 1-hour recordings taken in a supine position. Results showed that 1-hour recordings provided better reliability across multiple HRV parameters (intraclass correlations 0.13-0.71) compared to 5-minute recordings, with participants with tetraplegia demonstrating lower overall reliability.