This study has investigated the comparison of dominant and nondominant hand

This study has investigated the comparison of

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This study has investigated the comparison of dominant and nondominant hand grip and pinch strengths of healthy subjects and their relation with hand dominance. In accordance with recent studies, our results revealed stronger grip and pinch strengths at dominant sides for the whole group. Only 14.09% of our subjects had stronger nondominant hand grips. A similar picture was obtained for the right handed participants (10.93%) whereas the ratio of stronger nondominant hand was significantly higher for left handed group (33.33%). Petersen et al analysed 48 left handed and 262 right handed subjects and found a significant difference between two groups (10) . 48% of left handed subjects had higher grip values at their nondominant side but this percentage was only 6.9% for right handed subjects. A general rule often used suggests that the dominant hand is approximately 10% stronger than the nondominant hand (10,11) . Hence, this rule has not been confirmed in our study in correlation with some other studies (10-12) . The 10% rule dates back to 1954, when Bechtol observed that most patients presented a difference of 5% to 10% between their dominant and nondominant hands on grip measurements (10) . Petersen et al questioned whether the 10% rule could be applied to the whole population (10,11) . They found that on average, grip strength in the dominant hand was 12.7 % stronger for right handed people. Left handed subjects showed no such difference between the dominant and nondominant hand. ln our right handed group, grip strength scores were 8.20% higher for dominant hand, whereas this percentage was 3.20% for our left handed subjects. So we are in agreement with recent studies suggesting that 10% rule cannot be generalised to the whole population. While interpreting these results we must take into account that the world we live in is mostly designed for right handedness. Most tools and daily appliances are designed for the right hand. As a result, the right hand of both right and left handed people is exercised more often than left on a daily basis (5) . Pulp pinch measurements performed with manual pinchmeter were measured between the first and second digits of both hands. Pulp pinch is a positioning pinch used in activities requiring fine coordination rather than power. In our study, pinch strength values were significantly stronger at dominant sides. In total, 42 of 149 subjects (28.19%) were found to have at least equal or higher values for nondominant pulp pinch. The percentage of higher nondominant Fig. 3 Comparison of percentages of stronger nondominant hands for right and left handed subject groups. Dominant Nondominant
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Singapore Med J 2002 Vol 43(5) : 237 pinch scores were 28.12% and 28.57% for right and left handers respectively. This similarity may be due the fact that both hands are used for activities of daily living where fine coordination is required. The dominant hand is used mostly for strength requiring tasks. The data of this study indicate that there is less difference in the strength patterns of dominant and nondominant hands for pulp pinch values compared to hand grip.
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  • Fall '18
  • Test, Left-handedness, Right-handedness, Hand Dominance

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