Scatterplot between contact time and chronological age. Solid regression line has been fitted for contact time values related to age. Increased age was significantly associated with increased contact time (ß = −0.014, p = 0.002, CI95 = −0.023, −0.001). Years of running experience was not significantly associated with running speed (ß = 0.0081, p = 0.19, CI95 = −0.005, 0.021).