The investigators will investigate golfers with visual evidence of an involuntary movement while putting before and after treatment with a low dose of propranolol.
Dystonia affecting athletes has received little research attention and there has been a lack of awareness or interest among both physicians and athletes. Task-specific dystonias or occupational cramps affect people while writing, typing, and or playing a musical instrument. Our group has previously shown that a subset of golfers who complain of the yips appear to have a task-specific dystonia or golfer's cramp. The yips are characterized by an inability to appropriately complete a golf stroke, most often putting and chipping strokes. Most individuals with the yips describe a jerking or shaking movement that interrupts their swing. In many cases the yips are disabling and the golfer, including professional tour players, give up golfing. Golfers who have evidence of golfer's cramp will putt a series of putts during which they will be monitored for arm movements and putter movements. They will then be treated with a low dose of propranolol to see if there is a change in these parameters.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
DIAGNOSTIC
Masking
NONE
Enrollment
38
Single oral dose of 10 mg propranolol
The Opal Device (APDM, Inc.) will be used to measure wrist movement.
The SAM will be used to study putter stroke movement and ball movement.
Mayo Clinic in Arizona
Scottsdale, Arizona, United States
Mean Dynamic Change of Rotation at Impact
"Dynamic change of rotation at impact" is the velocity of rotation of the putter from the start of the forward swing until the time of impact with the golf ball.
Time frame: baseline, approximately 45 minutes after propranolol dosing
Mean Total Putter Face Rotation Before Impact
"Total putter face rotation before impact" is the degrees of rotation of the putter from the start of the forward swing until the time of impact with the golf ball.
Time frame: baseline, approximately 45 minutes after propranolol dosing
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The surface EMG will be used to evaluate co-contraction of the wrist flexor/extensor muscle groups and the wrist pronator/supinator muscle groups.