ABBaH: Activity Breaks for Brain Health. A Protocol for a Randomized Crossover Trial

Area of Science:

• Neuroscience
• Exercise Physiology
• Public Health

Background:

• Prolonged sitting is linked to negative brain health outcomes.
• The impact of short physical activity breaks on brain health mechanisms is not well understood.
• Middle-aged adults are a key demographic for investigating sedentary behavior effects.

Purpose of the Study:

• To examine the immediate effects of uninterrupted sitting versus frequent, short physical activity breaks on prefrontal cortex cerebral blood flow and cognitive function.
• To compare the efficacy of social breaks, brisk walking, and simple resistance activities in mitigating sedentary behavior's negative impacts.
• To assess secondary outcomes including psychological factors, arterial stiffness, cortisol, and blood glucose levels.

Main Methods:

• A randomized crossover study protocol involving 13 healthy middle-aged adults (40-60 years).
• Participants underwent three 3-hour laboratory sessions, each with different 3-minute activity breaks (social, walking, resistance) every 30 minutes.
• Cerebral blood flow (using functional near-infrared spectroscopy) and working memory were measured pre- and post-intervention.

Main Results:

• Data collection is ongoing; results will elucidate the impact of different break types on cerebral blood flow and cognitive performance.
• Analysis will compare the effects of uninterrupted sitting against various short physical activity interventions.
• Secondary outcome data will provide a comprehensive understanding of physiological and psychological responses.

Conclusions:

• The study will determine how frequent, short physical activity bouts influence cerebral blood flow and cognitive function compared to continuous sitting.
• Findings will inform strategies for mitigating sedentary behavior risks in middle-aged adults.
• Protocol publication underscores the importance of registered studies in sedentary behavior research.