Table 3.
Responsiveness of heart rate devices to change in walking activity.
| Cadence (%) | Five-min epochs | One-min epochs | ||||||
| FBTa |
Actigraph |
GARb |
Actigraph |
|||||
|
Percentage change (95% CI)c |
P (n)d |
Percentage change (95% CI) |
P (n) |
Percentage change (95% CI) |
P (n) |
Percentage change (95% CI) |
P (n) |
|
| 50-79 | 6.3 (3.2-9.3) | <.001 (27) | 4.7 (0.6-8.8) | .03 (20) | 2.8 (0.9-4.7) | .006 (30) | 3.5 (0.7-6.3) | .02 (28) |
| 80-99 | 15.4 (10.0-20.7) | <.001 (13) | 11.8 (−0.2 to 23.7) | .05 (7) | 3.5 (0.5-6.5) | .02 (26) | 6.6 (3.8-9.5) | <.001 (25) |
| ≥100 | 16.8 (7.9-25.8) | .005 (6) | 17.8 (−26.3 to 62.0) | .22 (3) | 1.8 (−1.6 to 5.3) | .27 (14) | 12.9 (5.7-20.2) | .003 (9) |
aFBT: Fitbit Charge HR.
bGAR: Garmin Vivosmart.
cValues presented are mean increase in heart rate from rest (“percentage change”), expressed as a percentage of estimated maximum heart rate, with 95% CI in parentheses.
dP values correspond to t tests comparing heart rate at rest and different cadences. Note the sample sizes (n) differ between comparisons as not all participants walked at each cadence, or there were no valid heart rate data at that activity level.