André Rivera

🏃‍♂️🫀 Exercise Prescriptions Should Be Risk-Stratified — Not Generic Current guidelines recommend ≥150 min/week of moderate-to-vigorous physical activity (MVPA) for everyone. But is that optimal for a 45-year-old low-risk individual and a 70-year-old very high-risk patient? This large UK Biobank cohort (72,884 participants, median 13.2-year follow-up) provides a more nuanced answer  . 🔬 What’s innovative? • Objective 7-day wrist accelerometer data • ESC-aligned SCORE2 risk stratification • Isotemporal substitution modeling (reallocating sedentary time) • Identification of optimal vigorous activity thresholds by risk group 📊 Key findings Each +150 min/week MVPA → • 20% lower CVD risk in very high-risk individuals • 16% reduction in high- and low-to-moderate-risk groups Higher-risk individuals benefit the most from increasing activity. BUT intensity matters. When replacing 300 min/week sedentary time: 🔹 Low-to-moderate risk → Any mix of moderate (MPA) and vigorous (VPA) works. More VPA = more benefit. 🔹 High risk → VPA should be ≤60 min/week (~20% of MVPA). 🔹 Very high risk → Optimal VPA ≈ 42 min/week (~14% of MVPA). Beyond that, benefits decline. In high-risk groups, excessive VPA may attenuate benefit—likely due to hemodynamic stress, endothelial dysfunction, and oxidative burden. 🎯 Take-Home Messages 1️⃣ Physical activity remains powerfully protective across all risk strata. 2️⃣ Higher-risk patients gain the largest relative benefit. 3️⃣ Vigorous exercise has a ceiling effect in high-risk individuals. 4️⃣ Exercise prescriptions should integrate formal risk stratification (e.g., SCORE2). Precision prevention now extends to lifestyle medicine. One size does not fit all.