## 4 Discussion  
The purpose of the present study was to evaluate the effect of wobble-board hand exercises on the asymmetry of physiological hand tremors in young, apparently healthy participants. The findings showed that hand exercises positively affected the hand tremor  
Figure 5: Means and standard deviations of the acceleration during tremor before (PRE) and after (POST) the wobble-board hand exercises in male and female participants. * Significant differences between male and female participants. Figure 6: Means and standard deviations of the acceleration during tremor before (PRE) and after (POST) the wobble-board hand exercises in male and female participants for dominant and non-dominant limbs. * Significant differences between dominant and non-dominant limbs for males and females, respectively. after intervention, by significantly reducing the inter-limb asymmetry of tremors for male and female participants. Moreover, the results from the present study suggested the importance of sex differences in evaluating the inter-limb asymmetry of tremors. Physiological hand tremor is one of the most common forms of tremors worldwide. It can be influenced by several factors, among these, sex and limb dominance [5; 50]. Understanding this variability is crucial when evaluating the effectiveness of therapeutic interventions, such as the utilization of an unstable platform and the manipulation of small objects. The findings of the present study suggested that this intervention had a significant impact on inter-limb (dominant vs. non-dominant) asymmetry of tremors. Independently of sex, participants showed significant differences in terms of tremors between limbs (inter-limb asymmetry) before the intervention while this difference was no longer present after the intervention. In line with the previous results, when including sex in the analysis, significant differences were found before the intervention for males and females while no differences emerged after the intervention. The results are in line with the literature showing that activity involving the exercise of small muscles (e.g., wobble-board hand exercises and gaming) could have a positive influence on motor skills, such as eye-hand coordination, manual dexterity, and tremors, especially in terms of a reduction in inter-limb asymmetry [13]. The presence of inter-limb asymmetry of tremors was due to the higher tremor value of the non-dominant hand compared to the dominant one. The inter-limb asymmetry of tremors found before the hand exercises could be attributed to several neurophysiological and functional differences between the dominant and non-dominant limbs, such as motor control. The dominant limb is used more frequently in daily activities, such as writing, eating, and performing manual labor [51]. As a result, the muscles and central nervous system tend to have greater coordination and motor control than the non-dominant limb. Although inter-limb asymmetry occurs in a resting condition, the present study showed different behavior after eye-hand coordination exercises on a wobble board. Another important aspect to consider is the different impact of the intervention in relation to sex. The differences between sexes observed in the POST evaluation could be explained by the different morphology of the hand. As reported in the literature, males' hands tend to be bigger than females' hands [5]. Balance exercises, such as those on a wobble board, represent a dynamic form of training that involves the displacement of the center of pressure of the hand resulting in improved physiological hand tremor control. This difference in hand size could have been responsible for producing different reactions to the same task, such as hand exercises. Focusing on these differences, the mechanisms involved in these reductions appear to differ between sexes. In male participants, the observed decrease in inter-limb asymmetry after exercise was due to an increase in tremor magnitude for the dominant hand.