Investigation of grip strength, pain threshold, pain tolerance and function in smartphone users.

PURPOSE/AIM OF THE STUDY: Few studies have demonstrated the effects of smartphone use on grip strength and upper extremity function. The present study was purposed to compare smartphone users' grip/lateral pinch strength, pain threshold/tolerance and upper limb function.

MATERIALS AND METHODS

A prospective cross-sectional study was conducted with 241 individuals. Participants were divided into three groups with the cut-off values of the Smartphone Addiction Scale (SAS). The Edinburgh Handedness Inventory (EHI) was used to determine the dominant side. Thumb pain threshold and tolerance were evaluated with the algometer. A hand dynamometer measured the grip and lateral pinch strength. Upper extremity functions were evaluated with the Shortened Disabilities of the Arm, Shoulder and Hand Questionnaire (Quick-DASH).

RESULTS

Handgrip strength of the dominant/non-dominant extremities and Quick-DASH scores were higher in low-level smartphone users ( < 0.05). There was no significant difference between the groups on lateral pinch strength and pain threshold/tolerance ( > 0.05). Smartphone usage significantly affected dominant and non-dominant hand grip strength (Standardized = -0.15, = -0.15,  < 0.05). In addition, the smartphone use level negatively affected dominant lateral pinch strength (Standardized = -0.12,  = 0.05). On the other hand, smartphone use positively affected upper extremity function (Standardized  = 0.17,  < 0.05).

CONCLUSIONS

As smartphone addiction increases, standard handgrip strength and functionality decrease. Pain threshold/tolerance is not affected by smartphone use. Future studies should focus on fine motor skills to present a more comprehensive upper limb function evaluation.