Is it dangerous to lift heavy weights after 40?

Resistance training including heavy loading (above 70% of one-repetition maximum) is safe for men over 40 without cardiovascular contraindications, with the acute cardiovascular risk of resistance training being substantially lower than the acute risk of maximal aerobic exertion, and the long-term health benefits of heavy resistance training (bone density, insulin sensitivity, sarcopenia prevention, mortality reduction) substantially outweigh the acute risks when proper technique is used (Featherstone & Bhaskaran, Heart, 2004).

The precautions for men over 40: ensure adequate warm-up before heavy sets (progressive loading from 50% to 70% to working weight), use proper breath management (Valsalva briefly during maximal effort lifts is normal but do not sustain it), and if you have diagnosed hypertension, avoid sustained isometric contractions at very heavy loads (which transiently spike blood pressure to extreme levels). Men with known coronary artery disease should discuss a resistance training prescription with their cardiologist before loading heavily.

Honesty Scale: Solid (1) for resistance training safety in healthy men over 40. Solid (1) for the specific precautions.

What to do: If you have not had a cardiovascular evaluation in more than 5 years and are over 45, consider a basic screening (blood pressure, ECG, resting heart rate, fasting lipids) before starting a heavy resistance training program, not because heavy training is dangerous, but because knowing your cardiovascular status allows you to train appropriately.

For the full picture, read The Strength/Grip Deep Dive