In sprint acceleration, the durations of the support phases are which values?

In sprint acceleration, the durations of the support phases are which values?

• A. .20 and .18
• B. .10 and .15
• C. .25 and .30
• D. .18 and .20

Answer: (A)

During sprint acceleration, the time your foot stays on the ground (the support or stance phase) is short and tends to shorten slightly as you speed up. The typical durations for the two consecutive support phases early in the acceleration are about 0.20 seconds for one step and 0.18 seconds for the next. This pattern fits how you train to maximize propulsion while keeping a quick cadence: contact time sits around two-tenths of a second and declines a bit as acceleration progresses. The other ranges don’t match the practical, observed contact times needed to generate force efficiently in acceleration, so the combination of 0.20 and 0.18 seconds is the best representation.

During sprint acceleration, the time your foot stays on the ground (the support or stance phase) is short and tends to shorten slightly as you speed up. The typical durations for the two consecutive support phases early in the acceleration are about 0.20 seconds for one step and 0.18 seconds for the next. This pattern fits how you train to maximize propulsion while keeping a quick cadence: contact time sits around two-tenths of a second and declines a bit as acceleration progresses. The other ranges don’t match the practical, observed contact times needed to generate force efficiently in acceleration, so the combination of 0.20 and 0.18 seconds is the best representation.