Key result
The ultra-portable ithlete™ HRV system demonstrated a strong overall correlation (r=0.86) with the reference CheckMyHeart™ device for assessing heart rate variability at high altitude.
Why the study?
Does the portable ithlete HRV system provide similar heart rate variability measurements compared to a reference 5-minute ECG recording in healthy volunteers at high altitude?
Observational (n=12)
Does the portable ithlete HRV system provide similar heart rate variability measurements compared to a reference 5-minute ECG recording in healthy volunteers at high altitude?
The portable ithlete HRV system provides similar results to a reference 5-minute ECG recording for assessing heart rate variability at high altitude, offering a more convenient assessment method.
Answers are grounded in this paper and cite their sources.
Portable HRV monitoring correlates strongly with reference ECG at altitude; leaves open validation in larger cohorts before routine use.
Summary Heart rate variability ( HRV ) is a useful index of autonomic function and has been linked to the development of high altitude ( HA ) related illness. However, its assessment at HA has been undermined by the relative expense and limited portability of traditional HRV devices which have mandated at least a minute heart rate recording. In this study, the portable ithlete ™ HRV system, which uses a 55 s recording, was compared with a reference method of HRV which utilizes a 5 min electrocardiograph recording (CheckMyHeart ™ ). The root mean squares of successive R‐R intervals ( RMSSD ) for each device was converted to a validated HRV score (ln RMSSD × 20) for comparison. Twelve healthy volunteers were assessed for HRV using the two devices across seven time points at HA over 10 days. There was no significant change in the HRV values with either the ithlete ( P = 0·3) or the CheckMyHeart ™ ( P = 0·19) device over the seven altitudes. There was also a strong overall correlation between the ithlete ™ and CheckMyHeart ™ device ( r = 0·86; 95% confidence interval: 0·79–0·91). The HRV was consistently, though non‐significantly higher with ithlete ™ than with the CheckMyHeart ™ device [mean difference (bias) 1·8 l; 95% CI −12·3 to 8·5]. In summary, the ithlete ™ and CheckMyHeart ™ system provide relatively similar results with good overall agreement at HA .
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Boos et al. (2016) conducted an observational in Healthy volunteers at high altitude (n=12). ithlete™ HRV system vs. CheckMyHeart™ HRV device was evaluated on Correlation of RMSSD-derived HRV scores between devices (r=0.86, 95% CI 0.79 to 0.91). The ultra-portable ithlete™ HRV system demonstrated a strong overall correlation (r=0.86) with the reference CheckMyHeart™ device for assessing heart rate variability at high altitude.
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