The Conjugacy of Some Anthropometric Parameters with the Strength of the Brush and the Load Distribution on Its Zones

Abstract

The aim of this study was to estimate the relationship of the anthropometric parameters of an individual with the strength of the hand and the nature of the load distribution in its various zones when performing a cylindrical grip in practically healthy individuals. Anthropometric parameters and the results of biomechanical examination of both hands were analyzed in 78 practically healthy individuals (39 men, 39 women) of the most able-bodied age (from 19 to 50 years). The height and weight of the volunteers were measured using a manual electronic dynamometer ""Jamar Smart"" – the strength of the right and left hands (in kilograms). The dynamometry of the hand was performed in a sitting position, while the arms of the subject were located on the armrests, the elbow was bent at an angle of 90°, the forearm was in a neutral position, and the hand was in the extension position in the wrist joint at an angle of about 30°. The anthropometric characteristics of the hand were recorded by measuring (in cm) the lengths of the rays of the hand and fingers, and the length and width of the palm. Determination of the degree of load on various parts of the brush (as a percentage) was carried out using the hardware and software complex ""Teksan"" (USA). It is established that the strength of the brush depends on the anthropometric characteristics of the individual and its linear dimensions: the ""longer"" and ""wider"" the brush, the higher its strength indicators. When performing a cylindrical grip, the maximum load falls on the fingers, among which the I-IV are the most involved, to a lesser extent – the V finger and the tenar area. It was revealed that the load distribution indicators for different zones of the right and left hand differ: when performing a cylindrical grip with a weaker brush, the main load falls on the tenar area and the first finger. At the same time, the achievement of maximum grip with a weaker brush is achieved by the maximum involvement of small hand muscles in the process.