Knowing how much discussion there has been about wrist/hand symptoms on list
in the past I thought I would share my notes from a recent conference. I have
edited to keep it rather on the "lighter" side, but this is stuff based in
peer reviewed journals and is reinforcing some of the models that have been out
there. Interestingly I think it will shape even more comprehensive treatment
in the future (more in the next post)
Dee
Research in Rat Models-
HRHF-High Rep High Freq Cycle Group
HRLF-High Rep Low Freq Cycle Group
In both groups at 3-6 weeks tissue changes were noted in nerves and muscles
Changes were bilateral- even if the task was one handed.
Increase changes with increased performance
Research is now be beginning on what happens if repetition is decreased after
6-8 weeks
LRNF- Low Rep Nominal Force- no decline in performance
HRNF- Some Recovery of task performance by Week 6
HRHF- Decline at 3 weeks with ongoing decline
Recovery is dose dependent
MSD Risk Factors
Physical
Repetition- high= (hand) <30 sec cycle, low=>30 sec cycle (Silverstein
1986)
-for LB see NIOSH
Force- High=>4kg, Low=<1kg (Silverstein)
Posture- awkward or static
Vibration
Mechanical- pounding or leaning
Environmental- temp or lighting
PsychoSocial
Work organizational
Work structure flow
Amount of decision making
Supervision type
Social support
Stress
Individual Predisposition
Comorbidities (PMHx/leisure)
Psychosocial
MSD and Sickness Response
In rats signs of withdrawal coincide with peak local/systemic inflammation
Evidence for peripheral-central communication via peripheral stimulation
shows unilat injury can cause bilateral symptoms
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