The Claim
In older adults with obesity undergoing dietary weight loss, high-intensity resistance and impact training and aerobic training produce similar reductions in total body mass (approximately 5 kg), fat mass (approximately 3.5 kg), and appendicular lean mass (approximately 1 kg) over a 12-week period, indicating no significant difference in lean mass preservation between the two exercise modalities during caloric restriction.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Among older adults with obesity who are losing weight through diet, both high-intensity resistance training and aerobic exercise result in the same amount of weight loss, fat loss, and muscle loss over 12 weeks, with no difference in how much muscle is preserved.
See the scientific wording
In older adults with obesity undergoing dietary weight loss, both high-intensity resistance and impact training and aerobic training result in similar reductions in total body mass (≈5 kg), fat mass (≈3.5 kg), and appendicular lean mass (≈1 kg) over 12 weeks, indicating neither exercise modality significantly preserves lean mass during caloric restriction.
When the body is eating fewer calories, it shifts into a mode that breaks down muscle for energy. Even when muscles are stressed by heavy lifting or impact, the body's energy deficit shuts down the signals that build muscle, so muscle tissue still shrinks. The stress from exercise cannot overcome the strong signal to break down protein when calories are low.
What the research says
1 studyWhen older adults with obesity lose weight by eating less, both lifting weights and doing cardio cause about the same amount of muscle loss—neither one stops the muscle from shrinking much.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.