The Clinical Imperative for Advanced ASCVD Risk Assessment

Cardiovascular disease remains the leading cause of morbidity and premature mortality worldwide. Traditional risk scoring systems rely heavily on circulating lipid profiles, blood pressure, and chronological age. However, these tools frequently underestimate vascular vulnerability in individuals with normal body weight who harbor hidden visceral fat and muscle weakness. Consequently, modern preventive cardiology requires a refined approach to ASCVD risk assessment. Anthropometric measures such as waist circumference provide practical estimates of visceral adiposity. Meanwhile, functional metrics like handgrip strength reflect systemic muscular fitness and physiological resilience. Although clinicians frequently evaluate these physical indicators independently, their joint prognostic value has remained underappreciated. Furthermore, the biological pathways interconnecting central adiposity, dynapenia, and vascular injury require deeper understanding. Emerging multi-omics research now provides vital insights into these shared pathophysiological networks. Therefore, integrating simple physical measurements allows clinicians to identify high-risk individuals before overt clinical events occur.

Study Design and Methodology of the UK Biobank Cohort

To understand the joint impact of adiposity and muscle function, researchers conducted a large prospective cohort study within the UK Biobank. The investigation analyzed 271,061 adult participants who were free from cardiovascular disease at baseline. The investigators categorized waist circumference using sex-specific thresholds established by the World Health Organization. Concurrently, they stratified handgrip strength into age- and sex-specific tertiles using standardized dynamometer protocols. The primary clinical outcome was incident atherosclerotic cardiovascular disease during a median follow-up of 14.8 years. In addition, the researchers utilized multivariable Cox proportional hazards models to calculate hazard ratios while adjusting for potential confounders. To evaluate additive interaction, the study calculated the relative excess risk due to interaction, attributable proportion, and synergy index. Beyond epidemiological associations, the investigators performed exploratory mediation analyses using high-throughput proteomic and metabolomic platforms. This multi-omics approach helped identify intermediary molecular pathways linking physical phenotypes to vascular disease.

Synergistic Risk of Central Adiposity and Muscular Dynapenia

During the 14.8-year follow-up period, 27,189 participants developed incident atherosclerotic cardiovascular disease. Both high waist circumference and low grip strength independently predicted elevated cardiovascular risk. Specifically, participants with elevated waist circumference demonstrated a 35% higher risk of cardiovascular events compared to reference groups. Similarly, individuals in the lowest grip strength tertile exhibited a 14% increased risk compared to those with high strength. However, the most significant risk occurred when participants presented with both physical abnormalities. Individuals exhibiting high waist circumference combined with low grip strength had a 53% higher risk of cardiovascular events. Furthermore, additive interaction analysis revealed meaningful synergy between central adiposity and muscular weakness. The relative excess risk due to interaction was 0.11, the attributable proportion was 7.04%, and the synergy index was 1.26. Sensitivity analyses consistently validated these risk estimates across diverse patient subgroups, confirming the robust nature of these findings.

Multi-Omics Insights: Inflammatory, Metabolic, and Vascular Pathways

To elucidate the biological drivers behind this combined risk, researchers conducted multi-omics mediation analyses. The investigators analyzed extensive circulating proteomic and metabolomic panels to trace intermediary signals. Importantly, the analysis identified shared molecular mediators connecting central adiposity, sarcopenia, and atherogenesis. These molecular profiles implicated several critical pathways, including systemic low-grade inflammation, innate immune activation, dysregulated lipid metabolism, and vascular remodeling. Pro-inflammatory cytokines, altered branched-chain amino acids, and distinct lipoprotein subfractions actively mediated this elevated cardiovascular vulnerability. Sarcopenic muscle displays impaired glucose uptake and releases unfavorable myokines. Concurrently, expanding visceral adipose tissue secretes pro-inflammatory adipokines and free fatty acids that promote endothelial injury. Therefore, pathological cross-talk between dysfunctional fat depots and wasting muscle accelerates arterial stiffness and atheromatous plaque progression. These multi-omics insights confirm that combining simple physical markers reflects complex systemic dysregulation across vital vascular networks.

Clinical Implications for the South Asian Phenotype

These findings carry substantial clinical relevance for South Asian populations, where the "thin-fat" phenotype occurs frequently. South Asian individuals often exhibit elevated visceral adiposity and reduced skeletal muscle mass at relatively low body mass index levels. Consequently, conventional body mass index metrics often miss cardiometabolic risk in this group. Integrating waist circumference with grip strength provides an accessible, non-invasive method to detect dynapenic abdominal obesity during routine consultations. In addition, South Asian patients experience premature atherosclerotic cardiovascular disease driven by severe insulin resistance and accelerated vascular aging. Because muscular weakness worsens peripheral insulin resistance, preserving skeletal muscle quality is vital for cardiometabolic protection. Clinicians practicing in South Asian settings should incorporate functional anthropometry alongside standard biochemical evaluations. Early identification of individuals with elevated waist girth and diminished grip strength allows targeted lifestyle and medical interventions before cardiovascular complications develop.

Translating Physical Phenotyping into Clinical Practice

Incorporating handgrip dynamometry and waist circumference measurement into daily clinical practice provides an efficient, cost-effective strategy for cardiovascular risk assessment. Handheld dynamometers are inexpensive, portable, and fast, requiring only two minutes during an outpatient encounter. When clinicians identify patients with low grip strength and elevated waist circumference, they should implement targeted prevention strategies promptly. These high-risk individuals benefit from structured exercise regimens emphasizing progressive resistance training and nutrient-dense dietary patterns. Resistance exercise preserves muscle mass, enhances insulin sensitivity, and improves functional strength, while dietary modifications reduce abdominal fat. Moreover, clinicians should optimize management of coexisting dyslipidemia, hypertension, and glycemic excursions in this high-risk subset. Combining accessible bedside measurements with standard lipid testing bridges the gap between basic anthropometry and precision cardiovascular medicine. Ultimately, physical phenotyping empowers clinicians to deliver personalized preventive care that reduces long-term atherosclerotic risk.

Why is measuring grip strength important for cardiovascular risk assessment?

Handgrip strength serves as a validated clinical marker for total skeletal muscle mass, muscular fitness, and biological resilience. Low grip strength independently associates with systemic inflammation, metabolic dysfunction, and cardiovascular mortality. When combined with standard clinical risk factors, grip dynamometry provides valuable incremental prognostic information, identifying vulnerable patients who might otherwise appear low-risk on conventional risk prediction scores.

How does visceral adiposity interact with muscular weakness to accelerate atherosclerosis?

Visceral adiposity secretes pro-inflammatory cytokines, bioactive adipokines, and free fatty acids that induce endothelial damage and oxidative stress. Simultaneously, weakened skeletal muscle impairs glucose disposal and alters protective myokine signaling. This dual dysfunction triggers persistent systemic inflammation, dyslipidemia, and vascular remodeling. Together, these combined metabolic disturbances exert synergistic adverse effects on arterial walls, markedly accelerating atherosclerosis and plaque progression.

What lifestyle interventions best address dynapenic abdominal obesity?

Managing dynapenic abdominal obesity requires combining progressive resistance training with targeted dietary modifications. Resistance exercise stimulates muscle protein synthesis, increases muscular strength, and improves peripheral insulin sensitivity. Concurrently, balanced caloric restriction with adequate dietary protein intake promotes visceral fat reduction while preserving lean skeletal muscle. Aerobic activity further enhances cardiorespiratory fitness, optimizing endothelial health and reducing cardiovascular disease risk.

Disclaimer: This content is for informational and educational purposes only, and does not substitute professional medical advice, diagnosis, or treatment. Refer to the latest local and national guidelines for clinical practice.

References

Luo J et al. Integrated Assessment of Abdominal Adiposity and Muscle Strength for Atherosclerotic Cardiovascular Disease Risk in UK Biobank: A Comprehensive Analysis From Population Cohort to Multi-Omics Molecular Exploration. Diabetes Obes Metab. 2026 Aug 25. doi: 10.1111/dom.71278. PMID: 42642342.

Celis-Morales CA, Welsh P, Lyall DM, et al. Associations of grip strength with cardiovascular, respiratory, and cancer outcomes and all cause mortality: prospective cohort study of half a million UK Biobank participants. BMJ. 2018;361:k1651.

Ross R, Neeland IJ, Matsuzawa Y, et al. Waist circumference as a vital sign in clinical practice: a Consensus Statement from the IAS and ICCR Working Group on Visceral Obesity. Nat Rev Endocrinol. 2020;16(3):177-189.