Table 3.
Reliability and sample size estimations for time-trial tests at sea level assuming α = 0.05 and β = 0.2
| 5% Increase |
20% Increase |
|||||||
|---|---|---|---|---|---|---|---|---|
| Modality | Type of Time Trial | ICC | SEM, s | Relative SEM, % | δz | Sample Size | δz | Sample Size |
| Cycling | 720 kJ (n = 42) |
0.77 (0.60–0.93) |
480 (379–635) |
10.1 (7.9–13.1) |
0.18 | 237 | 0.73 | 17 |
| Running | 11.2 km (n = 31) |
0.83 (0.62–0.94) |
422 (293–540) |
8.2 (6.1–10.9) |
0.36 | 61 | 1.46 | 6 |
| Running | 3.2 km (n = 32) |
0.89 (0.83–0.94) |
81 (59–119) |
8.6 (6.3–12.2) |
0.20 | 190 | 0.81 | 13 |
Values in parentheses for the reliability statistics are bootstrapped 95% confidence intervals. ICC, intraclass correlation coefficient, reliability derived from repeated sea-level performances; relative SEM, standard error of measurement (SEM) relative to mean sea-level time-trial performance time; δz, effect size.