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Group processes and physiological health in group-based interventions: A systematic review
Alžběta Lebedová1, Siobhán M Griffin1, Elayne Ahern1
1University of Limerick, Ireland.
Journal of Health Psychology
|April 26, 2026
Summary
Group processes in interventions can improve health by reducing stress biomarkers like blood pressure and cortisol. Fostering social support and cohesion is key for better physiological outcomes.
Area of Science:
- Psychology
- Health Sciences
- Social Sciences
Background:
- Social identity and group processes significantly impact psychological and physical health.
- The specific effects of these processes on stress-related biomarkers require further investigation.
Purpose of the Study:
- To systematically review and meta-analyze group-based interventions focusing on physiological markers of stress and long-term health.
- To explore the relationship between social identity processes within interventions and physiological health outcomes.
Main Methods:
- Systematic review and meta-analysis of 14 studies selected from 1606 records.
- Examination of physiological markers including blood pressure, heart rate variability, and salivary cortisol.
- Analysis of the role of group processes such as social support, cohesion, working alliance, and social norms.
Main Results:
- Interventions did not consistently show biomarker improvements compared to controls.
- Significant reductions in blood pressure, increased heart rate variability, and lower salivary cortisol were observed when key group processes were effectively mobilized.
- Positive group processes correlated with more adaptive physiological functioning (r = -0.19), indicating healthier responses.
Conclusions:
- Group-based interventions can influence physiological health by modulating stress-related biomarkers.
- Actively fostering supportive and cohesive group environments is crucial for maximizing the health benefits of interventions.
- Social identity processes play a significant role in the effectiveness of group interventions for physiological health.
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