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Decreased Initial Peak Pain Sensation with Aging: A Psychophysical Study
Ines Daguet1,2, Kayla Bergeron-Vezina1,2, Marie-Philippe Harvey1,2
1Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC, Canada.
Journal of Pain Research
|October 16, 2020
Summary
Older adults experience lower initial pain intensity compared to younger adults, with similar pain levels later on. This age-related difference in pain sensitivity was observed in both arm and lower-back regions.
Area of Science:
- Neuroscience
- Gerontology
- Pain Research
Background:
- Aging is linked to physiological changes, including altered nociception (pain perception).
- Previous research on age-related pain sensitivity has yielded conflicting results.
- The impact of aging on the temporal dynamics of pain perception requires further investigation.
Purpose of the Study:
- To investigate how aging influences the temporal progression of pain intensity.
- To assess age-related differences in initial peak and late-phase pain perception.
- To determine if age effects on pain perception vary by stimulation site (appendicular vs. axial).
Main Methods:
- 13 young adults (mean age 27.9) and 13 older adults (mean age 67.5) participated.
- Experimental heat pain was applied to the forearm and lower back for 2 minutes.
- Participants continuously rated pain intensity using a computerized visual analogue scale.
Main Results:
- Initial pain intensity (0-30 seconds) was significantly lower in older adults versus young adults.
- Late-phase pain intensity (30-120 seconds) was comparable between the age groups.
- These age-related differences in initial pain were consistent across both appendicular and axial stimulation sites.
Conclusions:
- Older adults exhibit reduced initial pain sensitivity, potentially due to peripheral or central nervous system changes.
- This age-related decline in early pain perception may affect both arm and lower-back regions.
- Findings suggest potential clinical implications, including increased injury risk and underestimation of pain severity in older adults.
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