At approximately what heart rate do complex motor skills deteriorate?

• A. 125 bpm
• B. 145 bpm
• C. 135 bpm
• D. 165 bpm

Answer: (B)

When you perform tasks that require precise control, timing, and coordinated movements, your nervous system needs a steady stream of resources to fine-tune every action. As heart rate climbs during intense effort, arousal rises and those resources get stretched thinner. The result is slower processing, narrowed attention, and less accurate neuromotor control. This is why complex motor skills start to deteriorate at higher levels of exertion—the body is operating in a high-arousal state where precision becomes harder to maintain. While the exact point can vary from person to person, the pattern is that precision-focused skills degrade in the high end of exertion, which is why that threshold is the best match among the options.