Table 3.
ICCs and SEMs for the Charge HR and ZB Heart Rate Variables in the Rest, mCAFT, and Recovery Phases
| Measure | Time, min:s | Rest |
mCAFT |
Recovery |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| ICC | SEM | 95% CI | ICC | SEM | 95% CI | ICC | SEM | 95% CI | ||
| 1st | 0:30 | 0.98 | 1.08 | 0.96, 73.70 | 0.89 | 0.98 | 0.83,103.30 | 0.71 | 8.35 | 0.62,147.86 |
| 2nd | 1:00 | 0.98 | 1.10 | 0.96, 73.97 | 0.95 | 3.20 | 0.92,113.77 | 0.83 | 6.47 | 0.73,126.04 |
| 3rd | 1:30 | 0.98 | 1.02 | 0.96, 73.67 | 0.98 | 2.25 | 0.96,120.91 | 0.84 | 5.48 | 0.73,114.34 |
| 4th | 2:00 | 0.97 | 1.32 | 0.96, 74.40 | 0.96 | 3.72 | 0.93,126.99 | 0.82 | 5.39 | 0.71,108.56 |
| 5th | 2:30 | 0.97 | 1.22 | 0.95, 73.70 | 0.98 | 2.65 | 0.97,127.20 | 0.77 | 5.64 | 0.65,106.29 |
| 6th | 3:00 | 0.98 | 1.05 | 0.97, 73.57 | 0.98 | 2.97 | 0.97,128.82 | 0.75 | 5.75 | 0.61,101.77 |
| 7th | 3:30 | 0.98 | 1.06 | 0.96, 73.74 | 0.96 | 2.96 | 0.93,117.80 | 0.80 | 4.74 | 0.71,98.29 |
| 8th | 4:00 | 0.98 | 1.07 | 0.96, 73.80 | 0.97 | 2.84 | 0.95,126.57 | 0.76 | 5.14 | 0.62, 98.28 |
| 9th | 4:30 | 0.98 | 1.05 | 0.97, 73.81 | 0.97 | 2.99 | 0.96,131.85 | 0.80 | 4.79 | 0.68, 95.58 |
| 10th | 5:00 | 0.97 | 1.27 | 0.95, 73.95 | 0.96 | 3.68 | 0.93,135.71 | 0.81 | 4.79 | 0.70, 95.60 |
| 11th | 5:30 | 0.97 | 1.27 | 0.96, 74.20 | 0.98 | 2.63 | 0.97,136.66 | 0.75 | 5.30 | 0.62, 98.28 |
| 12th | 6:00 | 0.98 | 1.01 | 0.96, 73.59 | 0.99 | 1.91 | 0.99,136.74 | 0.74 | 5.61 | 0.57, 95.49 |
| 13th | 6:30 | 0.98 | 1.04 | 0.97, 73.59 | 0.97 | 2.11 | 0.94,126.14 | 0.89 | 3.58 | 0.69,91.82 |
| 14th | 7:00 | 0.98 | 1.10 | 0.97, 73.67 | 0.96 | 2.52 | 0.93,133.94 | 0.73 | 5.46 | 0.60, 94.99 |
| 15th | 7:30 | 0.97 | 1.24 | 0.95, 73.90 | 0.95 | 3.23 | 0.88,142.33 | 0.76 | 5.39 | 0.62, 94.06 |
| 16th | 8:00 | 0.97 | 1.19 | 0.96, 74.05 | 0.93 | 3.25 | 0.88,145.88 | 0.75 | 5.20 | 0.60,94.19 |
| 17th | 8:30 | 0.99 | 0.74 | 0.97, 73.36 | 0.96 | 2.56 | 0.92,147.02 | 0.72 | 5.53 | 0.60, 94.24 |
| 18th | 9:00 | 0.98 | 1.07 | 0.97, 74.01 | 0.35 | 2.73 | 0.91,150.35 | 0.68 | 5.66 | 0.58, 94.09 |
| 19th | 9:30 | 0.98 | 0.695 | 0.96, 73.76 | 2.59 | 8.550 | 0.98,128.55 | 0.69 | 5.40 | 0.53, 92.59 |
| 20th | 10:00 | 0.97 | 1.24 | 0.96, 73.93 | 0.99 | 1.55 | 0.96,140.04 | 0.77 | 4.51 | 0.64, 89.84 |
| 21st | 10:30 | – | – | – | 0.99 | 1.62 | 0.98,147.18 | – | – | – |
| 22nd | 11:00 | – | – | – | 0.99 | 1.53 | 0.98,150.50 | – | – | – |
| 23rd | 11:30 | – | – | – | 0.99 | 1.53 | 0.98,152.50 | – | – | – |
| 24th | 12:00 | – | – | – | 0.99 | 1.62 | 0.98,153.48 | – | – | – |
Note: Dashes indicate no value (testing phase ended).
ICC = intra-class correlation coefficient; SEM = standard error of measurement; Charge HR = Fitbit Charge Heart Rate; Z = Zephyr BioHarness; mCAFT = modified Canadian Aerobic Fitness Test.