The global consumption of caffeinated beverages such as coffee, matcha, chocolate-based drinks, soda, and energy drinks, has become an integral part of modern life. Caffeine, a central nervous system (CNS) stimulant, exerts profound effects on the neuromuscular system, which governs communication between the brain, spinal cord, and skeletal muscles. At the molecular level, caffeine functions primarily as an adenosine receptor antagonist, reducing neuronal inhibition and promoting increased neural excitability, prolonging reaction times, and thereby enhancing neuromuscular performance. This mechanism facilitates greater calcium ion release from the sarcoplasmic reticulum, improving actin–myosin cross-bridge cycling and contributing to increased muscle contraction strength and endurance (Davis et al., 2003; Davis and Green 2009; Spriet, 2014).

While moderate caffeine intake (up to 400 mg/day, per FDA recommendations) can enhance alertness and physical output, excessive or chronic consumption can disrupt neuromuscular equilibrium. Adverse effects include substance-induced movement disorders, eliciting twitching, tremors, tardive dyskinesia, weakness, recurring fatigue, restlessness, and impaired movement coordination, which reflect dysregulated or overstimulated neural and muscular systems. Furthermore, caffeine’s impact is moderated by dosage, source, and individual sensitivity. Natural sources such as matcha and cacao are often perceived as beneficial due to their content of L-theanine and antioxidants, whereas soda and energy drinks are associated with hypokalemia, cardiovascular strain, and dependency (Mayo Clinic, 2022; FDA, 2024; Harvard School of Public Health, 2023; Harvard and Chen 2023).

Beyond its physiological implications, caffeine has also become a media-mediated scientific topic, with public perceptions increasingly shaped by how health information is framed in digital and video-based communication. Platforms such as TED-Ed, the Institute of Human Anatomy, Doctor Mike, Dartmouth Health, and High Spirit Pharmacist have emerged as popular sources of health learning for both students and the general public. These platforms combine education and entertainment, influencing how audiences interpret scientific evidence, assess risk, and form emotional or behavioral attitudes toward caffeine consumption.

Guided by this context, this study investigates audience perceptions of the impact of intense caffeinated beverages on the human neuromuscular system through a media communication lens. It explores how video-based scientific narratives influence understanding, curiosity, and concern regarding caffeine’s physiological effects and how these perceptions align or diverge from biomedical evidence.

This study draws upon two intersecting theoretical perspectives that inform both its analytical approach and interpretation:

Rooted in communication studies (Entman, 1993; Nisbet, 2009), Framing Theory explains how the structure, tone, and emphasis of media messages influence public interpretation of scientific information. Educational or cautionary framing can enhance understanding and critical engagement, whereas promotional or sensational framing can distort risk perception and erode trust in scientific authority. In video-based learning environments, framing directly shapes audience sentiment, engagement, and comment tone, as identified in this study’s Communalytic analysis.

Together, these frameworks support the study’s dual emphasis on biological understanding and communication dynamics. By integrating neuromuscular physiology with media analysis, this research bridges the gap between scientific accuracy, audience perception, and policy translation, advancing health literacy, improving science communication, and informing future advocacy for evidence-based caffeine regulation.

To evaluate how both scientific literature and media narratives portray caffeine’s influence on the human neuromuscular system.

To analyze how learners and students of Physiology and Anatomy perceive, interpret, and emotionally respond to caffeine-related content delivered through video-based communication.

To examine the scope and limitations of current federal policies governing caffeine regulation and identify specific areas where direct advocacy can improve public health communication.

To propose evidence-informed policy recommendations that align scientific findings with federal health standards and advance consumer protection through effective science communication.

Using Communalytic as the analytical tool, video content discussing caffeine consumption and its physiological effects was systematically collected and examined. The study employed qualitative content analysis to identify recurring themes, audience reactions, and sentiment patterns within 23 student research projects synthesizing video-based educational sources on matcha, soda, and chocolate-based caffeinated beverages.

Qualitative, video-based content and sentiment analysis was conducted across educational and medical communication platforms (TED-Ed, Institute of Human Anatomy, Dartmouth Health, Doctor Mike, High Spirit Pharmacist). Each source was analyzed for:

Scientific accuracy (alignment with physiological evidence),

Tone (educational, promotional, cautionary), and

Audience reaction (measured through comments, sentiment tone, and engagement).

Additionally, peer-reviewed articles and official health resources (FDA, CDC, Mayo Clinic, Harvard School of Public Health, 2023) provided clinical context on caffeine’s neuromuscular effects and safe consumption thresholds.

A universal understanding (100%) of caffeine’s role as an adenosine receptor antagonist emerged across all reviewed projects, establishing this mechanism as the central explanation for caffeine’s modulation of neural excitability and motor control.

All student analyses demonstrated comprehension of dose–response relationships and acknowledged the FDA’s 400 mg/day guideline as the recognized safety threshold for adult caffeine consumption.

At the muscle physiology level (67%), findings accurately described caffeine’s effect on calcium ion release from the sarcoplasmic reticulum, enhancing actin–myosin cross-bridge cycling, reaction time, and power output.

However, projects reported that higher caffeine doses reduced performance efficiency, leading to neuromuscular fatigue, substance-induced movement disorders e.g tremors, late appearing fatigue with weakness, and impaired coordination (100%).

Only 33% of analyses included discussion of tolerance mechanisms or individual variability, highlighting a knowledge gap in receptor desensitization and adaptation.

Using Communalytic sentiment and engagement analysis, the following trends emerged from audience comment data:

Positive reactions (40%) emphasized improved focus, motivation, and exercise performance. Viewers expressed curiosity about optimal dosage and biological mechanisms, particularly appreciating animated and visually explained videos (e.g., TED-Ed, Institute of Human Anatomy).

Neutral reactions (35%) reflected a balanced understanding, with comments highlighting moderation and appreciation for educational clarity. Many audiences acknowledged caffeine’s benefits when consumed responsibly.

Cautionary or negative reactions (25%) revealed concerns about heart palpitations, sleep apnea, substance-induced muscle tension, and addiction and dependency. A subset of viewers criticized promotional or sensational content for oversimplifying physiological risks.

Students’ synthesis of comment sentiment suggested that audience engagement correlates with educational tone, videos grounded in scientific explanation generated more constructive, inquisitive dialogue, whereas commercial or entertainment-oriented videos prompted emotive, polarized responses.

This study examined how audiences perceive the impact of intense caffeinated beverages on the human neuromuscular system through video-based educational platforms, linking scientific evidence to public understanding and policy implications. The results demonstrate that while audiences generally understand caffeine’s fundamental mechanism as an adenosine receptor antagonist, perceptions vary depending on the source, framing, and beverage type.

Overall, this research illustrates that audience perception of caffeinated beverages is shaped by both scientific knowledge and media framing. Moderate consumption aligns with neuromuscular benefits, while excessive intake poses tangible risks. Effective science communication, aligned with federal policy and proactive advocacy, is essential to translating evidence into informed public behavior. By bridging the gap between physiology, policy, and perception, this study supports the development of future policies that promote health literacy, mitigate risk, and empower audiences to make informed choices regarding caffeine consumption.