Muscle Wasting: A Silent Threat to Longevity and Health
Muscle wasting, also known as sarcopenia, is a condition characterized by the loss of muscle mass and strength, which typically happens as we age. However, its impact on our overall health and longevity is often overlooked. This study provides a comprehensive examination of the relationship between muscle wasting and mortality risk in adults, shedding light on the critical role of maintaining muscle health for a longer and healthier life.
The study is a systematic review and meta-analysis of 49 prospective studies, involving a total of 878,349 participants. The researchers found that muscle wasting was associated with higher mortality risks from all causes, cardiovascular disease, cancer, and respiratory disease. In simple terms, individuals with muscle wasting were more likely to die from these causes compared to those with normal muscle mass. This association remained significant regardless of muscle strength, indicating that muscle mass alone plays a crucial role in determining these risks.
Interestingly, the study also revealed that the risks of muscle wasting-related mortality were lower in studies with longer follow-ups, suggesting that the negative effects of muscle wasting may be mitigated over time, possibly through interventions such as exercise and nutrition. The study concludes that early detection and treatment of muscle wasting could be key to reducing mortality risk and promoting healthy longevity.
Article Information
Association of muscle wasting with mortality risk among adults: A systematic review and meta-analysis of prospective studies
Published on J Cachexia Sarcopenia Muscle by Huan-Huan Zhou et al.
Abstract
The relationship between muscle wasting and mortality risk in the general population remains unclear. Our study was conducted to examine and quantify the associations between muscle wasting and all-cause and cause-specific mortality risks. PubMed, Web of Science and Cochrane Library were searched until 22 March 2023 for main data sources and references of retrieved relevant articles. Prospective studies investigating the associations of muscle wasting with risks of all-cause and cause-specific mortality in the general population were eligible. A random-effect model was used to calculate the pooled relative risk (RR) and 95% confidence intervals (CIs) for the lowest versus normal categories of muscle mass. Subgroup analyses and meta-regression were performed to investigate the potential sources of heterogeneities among studies. Dose-response analyses were conducted to evaluate the relationship between muscle mass and mortality risk. Forty-nine prospective studies were included in the meta-analysis. A total of 61 055 deaths were ascertained among 878 349 participants during the 2.5- to 32-year follow-up. Muscle wasting was associated with higher mortality risks of all causes (RR = 1.36, 95% CI, 1.28 to 1.44, I2 = 94.9%, 49 studies), cardiovascular disease (CVD) (RR = 1.29, 95% CI, 1.05 to 1.58, I2 = 88.1%, 8 studies), cancer (RR = 1.14, 95% CI, 1.02 to 1.27, I2 = 38.7%, 3 studies) and respiratory disease (RR = 1.36, 95% CI, 1.11 to 1.67, I2 = 62.8%, 3 studies). Subgroup analyses revealed that muscle wasting, regardless of muscle strength, was significantly associated with a higher all-cause mortality risk. Meta-regression showed that risks of muscle wasting-related all-cause mortality (P = 0.06) and CVD mortality (P = 0.09) were lower in studies with longer follow-ups. An approximately inverse linear dose-response relationship was observed between mid-arm muscle circumference and all-cause mortality risk (P < 0.01 for non-linearity). Muscle wasting was associated with higher mortality risks of all causes, CVD, cancer and respiratory disease in the general population. Early detection and treatment for muscle wasting might be crucial for reducing mortality risk and promoting healthy longevity.
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