Oxygen saturation during aerobic and resistance exercises should?

• A. Rise significantly above resting levels
• B. Remain near resting level
• C. Drop to below 90%
• D. Vary widely without pattern

Answer: (B)

Oxygen saturation during exercise stays nearly the same as at rest in healthy individuals. The body boosts breathing and heart function to meet the higher oxygen demand, so the oxygen carried by arterial blood remains high (typically about 95–100%). While muscles extract more O2, the lungs and circulation keep arterial saturation from dropping significantly, so it shouldn’t rise well above resting or fall below about 90% in a healthy person. That’s why remaining near resting level is the best description for SpO2 during both aerobic and resistance exercise.