Study Links Muscle Density to Heart Attack and Premature Death Risk
Researchers have found that individuals with stronger chest and back muscles are less likely to experience a heart attack or die prematurely, according to an analysis utilizing artificial intelligence (AI).
The study, led by the University of Edinburgh, employed AI to analyze hospital scans from 1,722 patients, predominantly in their 50s, who presented with chest pain.
Findings indicated that those with higher muscle density in their chest and back areas had a reduced likelihood of suffering a heart attack or dying within ten years following the scan.
Researchers hypothesize that individuals with this type of "good-quality skeletal" muscle are more physically active and possess greater torso strength. Published in the journal Radiology, the results suggest that enhanced muscle quality could contribute to lowering the risk of heart attacks and early mortality.
Researcher Response and Personal Impact
Professor Michelle Williams, the study's senior author, described the findings as compelling enough to influence her personal fitness routine.
"It is fascinating that people’s skeletal muscle could be linked to their risk of having a heart attack. The muscles which show up in the scans we used – coronary computed tomography angiogram scans – are principally the back muscles, part of the pectoral muscles – or ‘pecs’ – and the intercostal muscles between the ribs.
So I am now personally interested in exercises like cycling, planks and pilates, which I enjoy and may have an effect on these muscles. However, we need far more research to better understand how exercise may affect muscle density, and how this may relate to heart health."
Professor Williams has begun attending the gym twice weekly and aims to walk for an hour daily following the study's insights.
Methodology: AI Analysis of Muscle and Body Composition
The research team utilized AI to assess various components of the upper body, including muscle, organs, bones, and fat. A key focus was on skeletal muscle attenuation, which refers to the brightness or darkness of muscle tissue in scan images.
Denser muscle appears lighter on scans because it reflects more X-ray beams. A brighter image correlates with higher quality, denser muscle that likely contains less fat.
Quantitatively, the study found that for every 10-point increase in scan brightness—indicating better muscle quality with reduced fat—a person’s risk of heart attack decreased by 31%. Additionally, the likelihood of death within ten years after the scan was 39% lower for individuals with higher muscle density.
Interestingly, muscle size did not correlate with heart attack risk or premature death, suggesting that muscle composition rather than volume is the critical factor.
Potential Clinical Applications and Expert Commentary
Future applications may include using routine heart scans to identify individuals with lower-quality muscle who could be at increased risk of heart attacks. Such patients might benefit from targeted interventions such as increased exercise, closer monitoring, or prioritization for medications that reduce heart attack risk.
Professor Bryan Williams, chief scientific and medical officer at the British Heart Foundation, which partially funded the study, commented on the findings:
"It is likely that people in this study with more dense muscle mass were more physically active and as a result may have better heart health. That is yet more evidence supporting the power of exercise."
