Assessing the Impact of Structured High-Intensity Interval Training (HIIT) on Cardiovascular Fitness and Mental Health in Undergraduate Students within a 12-Week Semester Program

Project Abstract

This study investigates how a 12-week structured HIIT program influences cardiovascular fitness and mental health among undergraduate students, integrating physiological measurements with psychological well-being assessments to provide a holistic view of exercise benefits in a university setting. A quasi-experimental design was employed, involving 120 participants randomly assigned to an HIIT intervention group or a control group following usual physical education activities. Baseline assessments included VO2 max estimations via treadmill testing, resting heart rate, blood pressure, body composition, hematological markers (lipids, glucose), and a suite of validated mental health instruments measuring anxiety, depression, perceived stress, mood, sleep quality, and self-efficacy. The HIIT protocol consisted of three sessions per week, each lasting 30–40 minutes, combining warm-up, repeated 30–60 second high-intensity bouts at 85–95% of maximum heart rate with equal or slightly longer active recovery periods, followed by cooldown. Sessions were progressively overloaded across weeks to maintain stimulus novelty and adherence. Adherence was monitored through session logs and heart rate monitors, with weekly check-ins to capture motivational factors and perceived exertion. Results demonstrated statistically significant improvements in aerobic capacity, as evidenced by a mean increase in VO2 max of 8.1% in the HIIT group compared to 1.2% in controls (p < 0.001). Resting heart rate and systolic blood pressure showed favorable reductions in the HIIT cohort (p < 0.05), alongside favorable shifts in body composition, notably reduced body fat percentage and increased lean mass (p < 0.05). Inflammatory and metabolic markers indicated improved lipid profiles, with reductions in total cholesterol and triglycerides and improved HDL cholesterol (p < 0.05). Mental health outcomes revealed meaningful decreases in self-reported anxiety and depressive symptoms, improved mood and sleep quality, and enhanced perceived stress management in the HIIT group versus controls (p < 0.01). Effect sizes indicated medium to large practical significance for most cardiovascular and psychological outcomes. Mediation analyses suggested that improvements in sleep quality and mood partially mediated the relationship between HIIT engagement and reduced perceived stress, while increased VO2 max mediated enhancements in mood and cognitive function. Qualitative data from participant interviews and weekly reflections highlighted high acceptability, enjoyment, and perceived barriers such as time constraints and fatigue during initial weeks, which diminished as participants experienced functional gains and social support within group sessions. The study discusses the implications for campus health promotion, suggesting that scalable HIIT interventions can be integrated into existing physical education curricula or as standalone fitness programs to achieve dual benefits for physical and mental health. Limitations include potential selection bias, short-term follow-up, and reliance on self-reported mental health measures. Recommendations for future research emphasize long-term maintenance, differential effects by gender and baseline fitness, and exploration of optimal HIIT dosing for diverse student populations.

Project Overview

What This Project Is About

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A simple study that looks at how a regular, structured HIIT program affects heart health and mood in college students over about 12 weeks. HIIT means short bursts of very hard exercise followed by brief recovery, done a few times per week.

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The Problem It Addresses

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Many students struggle with time to exercise and may not see clear benefits from traditional workouts. The project tests whether a concise, engaging HIIT plan can improve cardiovascular fitness and mental well-being, filling a gap in practical, time-efficient physical education strategies.

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Objectives of the Project

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1. Assess changes in cardiovascular fitness after 12 weeks of HIIT.
2. Evaluate changes in mood and stress levels associated with the program.
3. Check participant adherence and satisfaction with HIIT workouts.
4. Provide practical guidelines for implementing HIIT in university health programs.

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What You Will Do Step by Step

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1. Recruit a group of undergraduate volunteers and obtain consent.
2. Baseline testing for cardiovascular fitness and mood measures.
3. Implement a supervised HIIT schedule (12 weeks) with progressive intensity.
4. Monitor attendance and safety, adjust as needed.
5. Post-test the same fitness and mood measures.
6. Analyze data to compare pre/post results and interpret findings.

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Expected Outcome

Expect noticeable improvements in fitness markers and reduced stress or better mood scores, supporting HIIT as an effective, time-efficient option for student health programs.