Validity and reliability of a clinical non-exercise method for assessment of cardiorespiratory fitness using seismocardiography
Executive Summary
This study evaluates the validity and reliability of a non-exercise method for assessing cardiorespiratory fitness using seismocardiography (SCG). The SCG-based VO2max measurements showed high precision with strong day-to-day and test-retest reliability, but were systematically lower than the gold standard indirect calorimetry (IC) measurements. Despite this discrepancy, SCG VO2max demonstrated a significant positive correlation with IC VO2max, suggesting potential clinical utility for non-exercise fitness assessment.
Answer Machine Insights
Q: How does SCG VO2max compare to IC VO2max?
SCG VO2max was systematically lower by 3.3±2.4 ml/min/kg but showed a strong positive correlation (r=0.72, p<0.001).
On average SCG ˙VO2max was 3.3±2.4 ml/min/kg (mean ± 95% CI) lower than IC ˙VO2max (p=0.013, SCG ˙VO2max: 36.6±3.3 ml/min/kg, IC ˙VO2max: 39.9±3.0 ml/min/kg). A significant positive correlation was found between SCG ˙VO2max and IC ˙VO2max (Pearson, r=0.72, p<0.001).
Q: What is the reliability of SCG VO2max measurements?
SCG VO2max showed high day-to-day and test-retest reliability with intra-individual coefficients of variation of 4.5±2.9%.
Both SCG ˙VO2max and IC ˙VO2max was similar between test days (p=0.972) and the intra-individual coefficient of variation was 4.5±2.9% and 4.0±2.5%, respectively.
Key Results
SCG VO2max was 3.3±2.4 ml/min/kg lower than IC VO2max (p=0.013).
Pearson correlation between SCG VO2max and IC VO2max was r=0.72 (p<0.001).
Clinical Snapshot
Evidence Rating
Relevance
high Priority