Table 7.

Ground reaction force parameters for the different groups

Older adults Young adults
RunnersNon-activeRunnersNon-active
Vertical force (N kg-1)
    Maximum*21.62±1.9721.78±2.1923.68±2.4522.88±1.52
    Average**12.26±0.9012.54±1.2013.50±1.0113.34±0.87
Impulse (N s kg-1)
    Vertical**3.37±0.203.54±0.333.64±0.143.74±0.22
    Horizontal deceleration**,‡-0.17±0.03-0.20±0.04-0.20±0.02-0.21±0.03
    Horizontal acceleration*,‡0.17±0.030.20±0.030.19±0.020.21±0.04
  • Values are means ± s.d. of both legs; N=20 (older runners), N=10 (older non-active subjects), N=9 (younger runners), N=10 (younger non-active subjects).

    Asterisks indicate statistically significant differences between older and young adults: *P<0.05, **P<0.01; significant differences between runners and non-active individuals (P<0.05).

    There was no age-by-running activity interaction for the analysed parameters (P>0.05).