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Exercise dose, exercise adherence, and associated health outcomes in the TIGER study
Fred L Miller1, Daniel P O'Connor, Matthew P Herring
11Department of Kinesiology, Anderson University, Anderson, IN; 2Department of Health and Human Performance, University of Houston, Houston, TX; 3Department of Epidemiology, University of Alabama at Birmingham, Birmingham, AL; 4Symptom Research CAO, The University of Texas MD Anderson Cancer Center, Houston, TX; and 5Department of Kinesiology, The University of Georgia, Athens, GA.
A new HR physical activity score (HRPAS) accurately measures exercise dose, improving weight management and disease risk reduction. This score predicts health outcomes better than simple attendance tracking.
Area of Science:
- Exercise physiology
- Preventive medicine
- Health outcomes research
Background:
- Accurate measurement of exercise dose is crucial for evaluating weight management and disease risk reduction interventions.
- Traditional adherence measures like session attendance may not fully capture the impact of exercise on health.
Purpose of the Study:
- To examine cumulative exercise exposure, defined by HR-based intensity, duration, and frequency, as a measure of compliance and a predictor of health outcomes.
- To introduce and validate the HR physical activity score (HRPAS) as a quantifiable measure of exercise dose.
Main Methods:
- 1,150 adults completed a 15-week exercise protocol with HR monitoring.
- Exercise duration was adjusted for intensity (%HR reserve) to calculate HRPAS, summing intensity minutes per workout.
- Regression analysis assessed the relationship between HRPAS and physiological responses; compliance was compared between HRPAS and attendance.
Main Results:
- 868 participants were compliant based on HRPAS, 282 noncompliant; classifications differed from attendance in 9% of participants.
- Higher HRPAS significantly correlated with improvements in body mass, BMI, waist/hip circumference, body fat, systolic BP, resting HR, glucose, and cholesterol.
- Attendance-based adherence showed associations with body mass, hip circumference, body fat, resting HR, and cholesterol.
Conclusions:
- The HR physical activity score (HRPAS) provides a quantifiable measure of exercise dose.
- HRPAS is associated with greater improvements in health indicators compared to adherence defined solely by session attendance.
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