Table 1.
Demographic characteristics of subgroups defined based on age, gender and treadmill experience.
| Younger | Older | P-Value | ||
|---|---|---|---|---|
| Volunteers [n] | 20 | 20 | na | |
| Age [y] | 35.5 ± 8.6 | 66.5 ± 7.7 | <0.0001 | |
| Height [cm] | 172.6 ± 10.9 | 168.1 ± 11.0 | 0.1963 | |
| Weight [kg] | 67.3 ± 14.0 | 68.2 ± 12.1 | 0.8384 | |
| Treadmill Speed [km/h] | 4.7 ± 0.5 | 4.0 ± 0.6 | 0.0003 | |
| Female [%] | 50 | 50 | na | |
| Male | Female | P-Value | ||
| Volunteers [n] | 20 | 20 | na | |
| Age [y] | 50.6 ± 18.8 | 51.5 ± 16.8 | 0.862 | |
| Height [cm] | 178.5 ± 8.5 | 162.2 ± 6.0 | <0.0001 | |
| Weight [kg] | 76.2 ± 11.9 | 59.2 ± 7.1 | <0.0001 | |
| Treadmill Speed [km/h] | 4.4 ± 0.6 | 4.2 ± 0.6 | 0.355 | |
| Female [%] | na | na | na | |
| Naive | >12 mo | <12 mo | P-Value | |
| Volunteers [n] | 15 | 16 | 9 | na |
| Age [y] | 57.7 ± 15.8 | 48.5 ± 17.3 | 44.3 ± 19.4 | 0.112 |
| Height [cm] | 169.5 ± 12.5 | 170.6 ± 9.9 | 171.3 ± 11.6 | 0.921 |
| Weight [kg] | 69.3 ± 13.9 | 67.2 ± 12.6 | 66.1 ± 13.0 | 0.829 |
| Treadmill Speed [km/h] | 4.2 ± 0.8 | 4.4 ± 0.5 | 4.5 ± 0.4 | 0.548 |
| Female [%] | 40 | 50 | 66.7 | 0.449 |
Values represent participant numbers, the mean ± standard deviation or proportions (gender). P-values (right column of each table) represent results of the statistical subgroup comparisons (i.e. unpaired t-tests for the variables age,height, weight and treadmill speed; chi-square test for gender). Abbreviations: mo: months, na: not applicable.