Key result
Laughter decreased pulse wave velocity by 0.30 m/sec (p=0.01), whereas mental stress increased it by 0.29 m/sec (p=0.05), demonstrating divergent acute effects on arterial stiffness.
Why the study?
Does viewing films that induce laughter or mental stress affect arterial stiffness and central hemodynamics in healthy individuals?
RCT (n=18)
single-blind
randomized
Does viewing films that induce laughter or mental stress affect arterial stiffness and central hemodynamics in healthy individuals?
Mean Difference: -0.3
p-value: p=0.01
Laughter and mental stress have divergent acute effects on arterial stiffness and wave reflections, highlighting the impact of behavioral states on vascular function.
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Acute laughter may improve vascular function in healthy adults; leaves open whether sustained interventions alter outcomes in patients.
Vlachopoulos et al. (2009) conducted an RCT in Healthy (n=18). Laughter and mental stress (induced by viewing film segments) vs. Sham procedure was evaluated on Carotid-femoral pulse wave velocity (decrease of 0.30 m/sec, p=0.01). Laughter decreased pulse wave velocity by 0.30 m/sec (p=0.01), whereas mental stress increased it by 0.29 m/sec (p=0.05), demonstrating divergent acute effects on arterial stiffness.
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