Key result
Endurance exercise-induced cTn elevation typically normalizes within 72 hours but holds unclear prognostic value.
Why the study?
Cardiac troponin elevation occurs in exertional heat illness and exertional rhabdomyolysis, creating diagnostic uncertainty, yet extrapolating the benign paradigm of post-endurance exercise troponin elevation to exertional injury may be problematic.
While transient cardiac troponin elevation after endurance exercise is generally benign, its elevation in exertional rhabdomyolysis or heat illness requires careful clinical evaluation due to potential cardiovascular risk.
Answers are grounded in this paper and cite their sources.
Cautions against assuming troponin elevations in exertional injury are benign; leaves open.
Exertional heat illness (EHI) and exertional rhabdomyolysis (ER) are increasingly recognized causes of morbidity in competitive and tactical athletes. Cardiac troponin (cTn) elevation, traditionally viewed as a marker of myocardial necrosis, may also be seen in these settings and can create significant diagnostic and prognostic uncertainty. Although transient cTn elevation after endurance exercise is common and generally benign, extrapolation of this paradigm to exertional injury is likely problematic. This narrative review synthesizes current evidence regarding cTn elevation across three related but distinct contexts: isolated endurance exercise, ER, and EHI. We review the current understanding of cTn biology, emphasizing isoform-specific differences between cTn I and T, assay-related considerations, and mechanisms of cTn release beyond irreversible cardiomyocyte necrosis. In isolated endurance exercise, cTn elevation is typically transient, often normalizing over 24-72 hours, and has not been consistently associated with myocardial necrosis or adverse long-term cardiovascular outcomes. In contrast, ER and EHI are different pathophysiologic states characterized by systemic metabolic stress, skeletal muscle injury, and in EHI, systemic hyperthermia and direct thermal injury. The prevalence and prognostic significance of cTn elevation in ER and EHI are poorly defined. Current data, largely extrapolated from nonexertional cohorts, suggest potential associations with increased morbidity and long-term cardiovascular risk. However, prospective studies in ER and EHI are urgently needed to validate these findings. Accordingly, interpretation of cTn in exertional injury requires consideration of clinical context, troponin isoform and kinetics, electrocardiographic findings, and cardiac imaging. Improved understanding of these critical distinctions is essential to guide appropriate evaluation, risk stratification, and safe return-to-activity decisions.
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Dean et al. (2026) conducted a review in Exertional heat illness, exertional rhabdomyolysis, and endurance exercise. Cardiac troponin (cTn) elevation was evaluated. Cardiac troponin elevation is typically transient after endurance exercise, often normalizing over 24-72 hours, but its prognostic significance in exertional injury remains poorly defined.
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