Loss of peripheral vision and depth perception deteriorates at about what heart rate?

• A. 200 beats per minute
• B. 115 beats per minute
• C. 175 beats per minute
• D. 145 beats per minute

Answer: (A)

When you push yourself to the limit, your body redirects blood flow to working muscles and away from other areas like the eyes and brain. This can cause tunnel vision and a loss of depth perception as the brain receives less oxygen and nutrients for quick visual processing. That effect happens most noticeably at near-maximal effort, which for many young adults sits around 200 beats per minute. So, about 200 bpm is the point where peripheral vision and depth cues start to deteriorate.

Note: max heart rate varies with age (roughly 220 minus age), so the exact threshold shifts for older individuals. The other options reflect lower intensities where you’d still have full or adequate peripheral vision.