Correlation between physical efficiency index using Harvard step test and heart rate variation in college students

Area of Science:

• Exercise Physiology
• Autonomic Nervous System Function
• Cardiovascular Health

Background:

• The Harvard step test is a common measure of physical efficiency.
• Heart rate variation (HRV) reflects autonomic nervous system activity.
• Understanding the relationship between physical fitness and autonomic function is crucial for health assessment.

Purpose of the Study:

• To investigate the relationship between physical efficiency index (PEI) and heart rate variation (HRV) in college students.
• To identify specific HRV parameters that can predict PEI.
• To explore the implications of PEI for autonomic nerve function and recovery.

Main Methods:

• Sixteen college students were divided into higher PEI (HPEI) and lower PEI (LPEI) groups.
• HRV was measured using electrocardiography at rest and at specific intervals post-Harvard step test.
• Pearson correlation and multiple regression analyses were used to determine relationships between PEI and HRV parameters.

Main Results:

• PEI showed a negative correlation with RMSSD and a positive correlation with LF/HF ratio and normalized LF (normLF).
• Significant differences in HRV parameters, particularly normLF and RMS-SD, were observed between HPEI and LPEI groups post-exercise.
• While several HRV variables differed, only normLF and RMS-SD showed statistically significant differences between groups.

Conclusions:

• The physical efficiency index (PEI) derived from the Harvard step test can serve as an indicator of autonomic nerve function.
• Higher PEI may be associated with more favorable autonomic nerve activity adjustments during post-exercise recovery.
• These findings highlight the potential of simple fitness tests to provide insights into physiological regulatory mechanisms.