Even the slightest slump impacts range of motion
A study looked at 30 healthy young men, 18-35, with no recent history of shoulder problems. Shoulder range of motion was measured in 3 different sitting postures.
Their analysis “demonstrated significant differences in all comparisons (p < 0.001).”
- “Changes in sitting posture affect shoulder ROMs in all directions tested,” and…
- “Greater changes in shoulder ROMs were associated with greater increase in thoracic kyphosis,” and…
- “Even subtle changes in thoracic kyphosis need to be considered during shoulder evaluation.”
In other words: Slumping restricts shoulder motion, and it gets worse the more you slump.
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Kanlayanaphotporn, Rotsalai (2014). “Changes in Sitting Posture Affect Shoulder Range of Motion.” Journal of Bodywork and Movement Therapies. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/24725793