Key result
Cold face immersion decreased the fractal scaling index alpha1 from 0.85 to 0.67 (P<0.0001), whereas cold hand immersion increased it from 0.77 to 0.97 (P<0.01).
Why the study?
How do cold face and cold hand immersion affect the fractal organization of human heart rate dynamics in healthy subjects?
How do cold face and cold hand immersion affect the fractal organization of human heart rate dynamics in healthy subjects?
Absolute Event Rate: 0.67% vs 0.85%
p-value: p=<0.0001
The fractal organization of human heart rate dynamics is determined by the interplay between sympathetic and vagal outflow, with breakdown toward random dynamics occurring during coactivation.
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Site-specific cold immersion reveals opposing effects on HR fractal scaling; extends physiological insights but leaves open translation to patient care.
Tulppo et al. (2005) studied Healthy subjects (n=13). Cold face and cold hand immersion vs. Rest was evaluated on Fractal scaling index alpha1 during cold face immersion (p=<0.0001). Cold face immersion decreased the fractal scaling index alpha1 from 0.85 to 0.67 (P<0.0001), whereas cold hand immersion increased it from 0.77 to 0.97 (P<0.01).
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