Fitbit Air vs Amazfit Helio Strap (SCIENTIFIC Review)
In a Nutshell
Fitbit Air and Amazfit Helio Strap both deliver top-tier heart rate tracking on the biceps (99.3-99.4 overall scores), outperforming 85-97% of tested devices across cycling, running, and weightlifting. Fitbit Air leads in sleep stage accuracy (78 vs. 70 score) with 75-82% agreement against EEG reference, while Helio Strap edges slightly ahead in heart rate during exercise but trails in REM/light sleep detection. The Fitbit app offers more customization, and the reviewer prefers Fitbit Air overall due to superior sleep tracking.
These notes were generated by AI and may contain inaccuracies.
Both devices cost $99. The Fitbit Air and the Amazfit Helio Strap both offer strong performance, but each excels in different areas. The review focuses on data analysis to compare heart rate tracking and sleep stage tracking performance.
Indoor cycling is one of the easier exercises to track. The reviewer tested both devices on the biceps, the recommended wear position. The Fitbit Air on the biceps showed excellent performance with a correlation of 1.00 against the ECG reference. The Amazfit Helio Strap on the biceps performed slightly better, with points even closer to the reference line and a correlation also rounded to 1.00. Both devices achieved near-perfect overlap with the reference in individual sessions.
Running is more challenging due to increased movement. The Fitbit Air on the biceps achieved a correlation of 0.99. The Amazfit Helio Strap on the biceps performed slightly better with a correlation of 1.00 when rounded, though it showed minor deviation at higher heart rates. Both devices tracked individual runs accurately.
Outdoor cycling presents greater difficulty due to arm tension from steering and braking. The Fitbit Air on the biceps recorded a correlation of 0.98. The Amazfit Helio Strap on the biceps achieved 0.99, performing slightly better overall. Individual sessions showed minor deviations for both devices, with the Helio Strap having fewer small errors on average.
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