Can physical activity be simplified for health benefit?

Area of Science:

• Exercise Science
• Public Health
• Preventive Medicine

Background:

• Physical activity (PA) is linked to over 25 chronic conditions, including psychological stress.
• Cardiorespiratory fitness (CRF) is a key mediator of PA's health benefits.
• Current PA guidelines on duration and intensity are debated and prone to measurement errors.

Purpose of the Study:

• To develop and validate a New Zealand-specific physical activity frequency and type (PAFT) questionnaire.
• To assess PAFT's ability to predict CRF and psychological stress status.
• To determine if PA type and frequency alone can estimate PA's health benefits.

Main Methods:

• Experiment 1: 20 participants completed PAFT before CRF (VO2Peak) assessment in a lab setting.
• Experiment 2: 81 participants completed PAFT and the Perceived Stress Scale (PSS-10).
• Statistical analysis to determine the association between PAFT responses and health outcomes.

Main Results:

• Vigorous PA frequency strongly correlated with VO2Peak (R²=0.71, p<0.01).
• Vigorous PA frequency was the most significant predictor of lower psychological stress (p<0.01).
• PAFT demonstrated a strong predictive capability for both CRF and stress.

Conclusions:

• A simple PAFT questionnaire can predict CRF and psychological stress status.
• PA duration and intensity are not essential for estimating PA's health benefits.
• A minimum dose of two vigorous PA sessions per week is suggested to mitigate stress risk.