Occult Hypertension Linked to Coronary Plaque in Male Masters Athletes

The Paradox of the Atherosclerotic Athlete

While regular aerobic training is a cornerstone of cardiovascular health [1, 2], clinicians increasingly encounter a clinical paradox where lifelong endurance athletes present with significant coronary artery disease [3, 4]. Long-term high-intensity exercise is associated with complex cardiac adaptations, including myocardial fibrosis (the replacement of healthy heart muscle with fibrous scar tissue), which occurs at significantly higher rates in athletes compared to sedentary controls [5, 6]. Because these patients often maintain favorable lipid profiles and high cardiorespiratory fitness, traditional risk assessment tools frequently underestimate their actual cardiovascular burden [7, 8]. Identifying the specific physiological drivers of this accelerated atherosclerosis is critical for refining primary prevention and sports eligibility guidelines [4, 9]. A recent study investigates how hidden hemodynamic factors, such as hypertensive responses to exercise, may explain the development of high-risk coronary plaques in this seemingly protected population [10].

Screening for Hidden Hemodynamic Risk

The researchers conducted a cross-sectional analysis of 198 male masters endurance athletes to determine if occult hemodynamic abnormalities contribute to coronary artery disease in highly active individuals. This cohort was specifically selected for their lack of traditional cardiovascular warning signs. All participants maintained a low Framingham risk score of less than 10%, indicating a low predicted 10-year risk for major adverse cardiac events. Furthermore, the study excluded any individuals with a prior clinical diagnosis of hypertension, ensuring the sample represented athletes who would typically be cleared for high-intensity competition without further cardiovascular scrutiny. To uncover blood pressure irregularities that standard office readings often miss, the participants underwent 24-hour ambulatory blood pressure monitoring, a technique that tracks blood pressure fluctuations during daily activities and nocturnal periods. The diagnostic protocol also included an exercise blood pressure assessment to measure the systolic and diastolic response to peak physical exertion. These hemodynamic data points were then compared against detailed anatomical findings from coronary CT angiography (a high-resolution imaging modality that uses contrast dye to visualize the coronary arteries). This imaging allowed the authors to precisely measure the coronary artery calcification (CAC) score, identify the presence of luminal stenosis (the physical narrowing of the arterial opening), and detect specific high-risk plaque features that are prone to rupture.

High Prevalence of Undiagnosed Hypertension

The study revealed a substantial burden of occult hypertension within this seemingly healthy cohort, despite their high levels of physical fitness and low traditional risk profiles. Although none of the participants had a prior clinical diagnosis of high blood pressure, 78 athletes (39%) were hypertensive on ambulatory blood pressure monitoring, a diagnostic method that records blood pressure at regular intervals over a 24-hour period to capture fluctuations during daily activities and sleep. This finding suggests that nearly four out of 10 masters athletes may harbor masked hypertension, a condition where blood pressure remains within normal limits during a clinical visit but rises to pathological levels in real-world settings. For the practicing clinician, these data underscore the limitations of resting, office-based measurements when evaluating the cardiovascular risk of high-volume endurance athletes. The hemodynamic abnormalities extended beyond daily activities into the realm of peak physical exertion. The researchers found that 93 athletes (47%) demonstrated a hypertensive response to exercise, which is characterized by an exaggerated rise in systolic or diastolic pressure during a standardized stress test. This high prevalence is particularly clinically relevant because these individuals frequently engage in high-intensity training that subjects the coronary vasculature to these elevated pressures for extended durations. Because nearly half of the participants exhibited this response, clinicians should consider that a patient's athletic prowess does not preclude the presence of exercise-induced hypertension, a factor that may serve as a silent driver of arterial remodeling and atherosclerotic progression. Relying solely on resting blood pressure or Framingham risk scores may lead to the underdiagnosis of a primary driver of coronary artery disease in this population. These data suggest that more rigorous hemodynamic screening, perhaps incorporating ambulatory monitoring or stress testing, may be necessary to accurately assess and manage the cardiovascular health of the aging athlete.

Quantifying the Atherosclerotic Burden

The researchers used coronary CT angiography to quantify the extent of coronary artery calcification, a metric that serves as a proxy for the total burden of atherosclerosis. Among the 198 participants, the distribution of coronary artery calcification (CAC) scores revealed that nearly three-quarters of the cohort had detectable disease. Specifically, 94 athletes (47%) had a CAC score of 1 to 99 Agatston units (AU), representing mild calcification. More advanced atherosclerotic progression was also evident, as 32 athletes (16%) presented with a CAC score of 100 to 399 AU, and 15 athletes (8%) had a CAC score of 400 AU or greater. These data indicate that despite their high level of physical fitness, a substantial portion of these athletes carries a calcium burden that may warrant closer clinical monitoring. Beyond the volume of calcification, the study characterized the clinical severity of luminal narrowing and the specific morphology of the arterial lesions. The researchers found that 24 athletes (12%) had coronary stenoses greater than 50%, a level of narrowing that can potentially limit myocardial perfusion under high metabolic demand. When examining the composition of the plaques, the authors observed a variety of phenotypes. While 62 athletes (31%) had calcified plaque, which is often associated with more stable disease, others exhibited more concerning morphologies. Specifically, 32 athletes (16%) had mixed plaque, which contains both calcified and non-calcified elements, and 2 athletes (1%) had non-calcified plaque. The identification of vulnerable lesion characteristics provided further insight into the cardiovascular risk profile of this group. The researchers reported that 26 athletes (13%) had markers of high-risk plaque, a term referring to specific CT findings such as low-attenuation plaque or positive remodeling that are associated with an increased risk of rupture and acute coronary events. For the practicing physician, these findings are significant because they demonstrate that the coronary pathology in masters athletes is not limited to stable, heavy calcification. The presence of significant stenosis and high-risk plaque features in a notable percentage of this population suggests that even asymptomatic athletes with high exercise capacity may harbor clinically relevant coronary artery disease.

Hemodynamic Drivers of High-Risk Plaque

The researchers identified a strong correlation between occult hypertension and advanced markers of coronary disease, suggesting that sustained, often undetected, elevations in blood pressure drive atherosclerotic progression. Specifically, hypertension on ambulatory blood pressure monitoring was significantly associated with a coronary artery calcification score of 100 Agatston units or greater (OR: 2.56; 95% CI, 1.08 to 6.04). This finding indicates that athletes with hidden hypertension are more than twice as likely to have a substantial calcium burden compared to those with normal ambulatory readings. Furthermore, the study found that hypertension on ambulatory blood pressure monitoring was significantly associated with coronary stenosis greater than 50% (OR: 2.92; 95% CI, 1.17 to 7.33). For the practicing physician, these data suggest that 24-hour monitoring may be a necessary tool for identifying athletes at risk for clinically significant luminal narrowing that standard office readings might overlook. The hemodynamic response during physical exertion provided even more pronounced associations with high-risk coronary features. The researchers observed that a hypertensive response to exercise was significantly associated with coronary stenosis greater than 50% (OR: 4.72; 95% CI, 1.65 to 13.5). This nearly five-fold increase in the odds of significant stenosis highlights the potential of exercise stress testing to uncover underlying vascular pathology in asymptomatic individuals. Perhaps most critically for risk stratification, a hypertensive response to exercise was significantly associated with the presence of high-risk plaque (OR: 3.27; 95% CI, 1.27 to 8.43). These high-risk plaques, which include features such as low-attenuation or positive remodeling, are more prone to rupture and acute coronary syndromes. The data suggest that exaggerated blood pressure spikes during training may not only indicate existing disease but could also contribute to the development of vulnerable arterial lesions. These findings underscore the necessity of looking beyond resting blood pressure in the clinical evaluation of masters athletes. Because both ambulatory and exercise-induced hypertension are linked to advanced atherosclerosis and vulnerable plaque morphology, early identification of these patterns is essential for effective primary prevention. Timely clinical management of these classic cardiovascular risk factors, even in highly fit individuals, may reduce the overall burden of coronary atherosclerosis and mitigate the risk of acute cardiac events in the aging athletic population.

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