Peak ground reaction forces in elite sprinters during the forward support phase are generated within how many seconds?

Peak ground reaction forces in elite sprinters during the forward support phase are generated within how many seconds?

• A. 0.04
• B. 0.08
• C. 0.02
• D. 0.06

Answer: (A)

Peak ground reaction forces are reached very early in the stance phase for elite sprinters. When the foot lands, the leg stiffens rapidly and forcefully to propel the body forward, so the maximum ground reaction force occurs roughly 0.04 seconds (about 40 milliseconds) after contact. This rapid force-development is a hallmark of elite sprinting, driven by explosive muscle output and an efficient stretch-shortening cycle. Times like 0.06, 0.08, or 0.02 seconds imply peaks later or earlier than the typical rapid rise seen in elite sprinters, making 0.04 seconds the best match.

Peak ground reaction forces are reached very early in the stance phase for elite sprinters. When the foot lands, the leg stiffens rapidly and forcefully to propel the body forward, so the maximum ground reaction force occurs roughly 0.04 seconds (about 40 milliseconds) after contact. This rapid force-development is a hallmark of elite sprinting, driven by explosive muscle output and an efficient stretch-shortening cycle. Times like 0.06, 0.08, or 0.02 seconds imply peaks later or earlier than the typical rapid rise seen in elite sprinters, making 0.04 seconds the best match.