pulp pinch strengths were 6% and 5% higher for thedominant hand respectively.There are controversies regarding the differencesin hand grip strength values between the dominant andnondominant hands in left and right handed people.So this study was designed to evaluate the grip andpinch strength differences between sides for right andleft handed population.METHODSSubjectsThe study included 149 volunteers (81 male, 68 female)aged 24-60 years (mean 30.21 ±5.91 years). Participantswere recruited from the residents and fellows of differentdepartments at Ankara Research and EducationHospital. Criteria for inclusion were that there was norestriction of movement in the upper limbs and nohistory of inflammatory joint disease, neurologicaldisorder or injury to the upper extremity by self report.Dominant hand was defined as the one preferredfor daily activities like writing and eating and forhandling heavy objects. Hundred and twenty-eightparticipants were right hand dominant and 21 were lefthand dominant. No participants reported ambidexterity.Instrumentation and ProceduresAll measurements were obtained by two observers atthe same time of the day (between 10:00 and 12:00 am).Grip strengths were measured using a standard adjustablehandle Jamar dynamometer at standing position withshoulder adducted and neutrally rotated and elbow in
Singapore Med J 2002 Vol 43(5) : 235full extension. Results were recorded as kilograms(Fig. 1). For standardisation, the dynamometer wasset at the second or third handle position of whichthe participant claims to be more suitable(6). Formost of the participants second position whichwas considered to be the best level for grip evaluationand adopted by the American Society of HandTherapists for routine testing has been used(7). Pulppinch strength were measured between the first andsecond digits. Pinch strength measurements wereperformed with the subject seated by using manualpinchmeter which measures finger prehension force(Fig. 2). All measurements were performed forboth dominant and nondominant hands. Subjectsperformed three maximum attempts for eachmeasurement and the average value of these trialswas recorded. One-minute rests were given betweeneach attempt and hands were alternated to minimisefatigue affects. No verbal encouragements wereperformed. The calibration of both instrumentswas tested periodically during the study.Statistical analysisThe SPSS 8.0 for Windows package program wasused for statistical analysis. The data were analysedusing Mann- Whitney U test and student’s t test. p valuesequal to or less than 0.05 were accepted as significant(p<0.05).RESULTSOur study group consisted of 21 left and 128 righthand dominant total 149 participants. The minimum,maximum and mean values for grip and pulp pinchstrength of these participants are shown in Table I.
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Test, Left-handedness, Right-handedness, Hand Dominance
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