Which statement about CVD risk and exercise is true?

Question

BlackTom AI · Accepted Answer

Regular moderate physical activity can lower CVD risk by 20% or more.

1. Relevant knowledge points and concepts
- Cardiovascular disease (CVD) risk is influenced by modifiable factors including physical activity.
- Public health guidelines define “moderate” aerobic activity and recommend weekly targets to reduce chronic disease risk.
- Typical guideline: 150 minutes per week of moderate-intensity aerobic activity (or 75 minutes of vigorous activity), which is evidence-based to reduce CVD incidence by roughly 20%–30% on average.

2. Complete reasoning process step by step
- Compare the answer choices to guidelines and expected risk reduction.
- Translate guideline minutes into daily amounts and compare to the choices that state “one hour a day” or different risk percentages.
- Use evidence-based ranges for risk reduction from moderate activity to judge which statement is accurate.

3. Calculations and intermediate steps
- 150 minutes/week recommended = 150 ÷ 5 = 30 minutes/day for 5 days (or 2.5 hours/week).
- Option saying “one hour a day, five days a week” = 60 minutes × 5 = 300 minutes/week = 5 hours/week (double the guideline).
- Option saying “one hour a day, seven days a week” = 60 × 7 = 420 minutes/week = 7 hours/week.
- Epidemiologic studies generally report around a 20% (sometimes more) reduction in CVD events for those achieving guideline-level moderate activity; a 50% reduction is larger than typical population findings.

4. Why the correct answer is correct
- “Regular moderate physical activity can lower CVD risk by 20% or more” aligns with guideline levels (≈150 min/week) and with pooled-study estimates showing ~20%–30% risk reductions for people who meet recommended activity levels.

5. Why other options are incorrect
- “Doctors recommend exercising one hour a day, seven days a week” is inaccurate; guidelines recommend 150 min/week, not 7 hours/week.
- “Regular moderate physical activity can lower CVD risk by 50% or more” overstates typical effect sizes seen in population studies; 50% is not the standard estimate.
- “Doctors recommend exercising one hour a day, five days a week” misstates guidelines (this is 300 min/week, double recommended 150 min/week).

6. Conclusion
The correct choice is “Regular moderate physical activity can lower CVD risk by 20% or more,” which matches the provided answer.

Which statement about CVD risk and exercise is true?Single choice

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