Table 1.
Parameters in the second-order polynomial regression running speed (km.h−1) = a + bx + cx2, using the running speed of all runners in 1-year age and 5-year age groups by sex.
| 1-Year Age Groups | 5-Year Age Groups | |||
|---|---|---|---|---|
| Parameter | Women | Men | Women | Men |
| a (km.h−1) | −0.00117 | −0.001928 | −0.02773 | −0.04594 |
| b (km.h−1.years−1) | 0.07472 | 0.131 | 0.218 | 0.399 |
| c (km.h−1.years−2) | 8.650 | 8.868 | 9.413 | 10.230 |
| Age (years) | 31.93 | 33.97 | 30–34 | 35–39 |
| Running speed (km.h−1) | 9.84 | 11.09 | 9.84 | 11.10 |
The parameters a, b, and c are coefficients in the polynomial equation that shows the relationship between running speed and age. Based on the regression analysis, we calculated the parameters Age (the age or age group of peak performance) and Running speed (the performance of the corresponding Age).