Post-activation potentiation occurs 30 seconds to a few minutes after a high-intensity contraction.

• A. During contraction
• B. Hours after
• C. 30 seconds to a few minutes after
• D. Never

Answer: (C)

Post-activation potentiation is a temporary boost in muscle force that occurs after a heavy, high‑intensity contraction. This effect shows up as improved performance in the seconds to minutes after the conditioning activity. The muscle becomes more ready to produce force because the conditioning contraction triggers mechanisms like increased calcium sensitivity and enhanced neural drive, so the same stimulus can generate a stronger contraction shortly afterward. Because these neuromuscular changes peak quickly and then fade as fatigue or recovery processes take over, the potentiation window is typically around 30 seconds to a few minutes after the contraction. The other timing options don’t fit because the immediate moment of contraction isn’t when the enhancement is seen, and waiting hours would miss the transient window. Never would imply there’s no such short-term boost, which isn’t accurate.