Wpływ masy szkolnego plecaka transportowanego skośnie na prawym lub lewym barku i przy różnoimiennym biodrze na cechy postawy w płaszczyźnie strzałkowej i poprzecznej 7-letnich uczniów obojga płci

Abstract

Introduction. The continuing percentage of postural statics disorders may have its roots in the method of carrying the loads of school supplies. Aim. The aim of the study was to show the effects of the load of the container with school supplies carried obliquely on the left shoulder and right hip or on the right shoulder and left hip in the sagittal and transverse planes on the posture. Material and methods. Body posture tests were carried out on a group of 65 pupils aged 7 years, using the projection moire method in four positions: 1-the habitual posture, 2 – the posture after a 10-minute asymmetric loading, 3 – the posture assumed one minute after removing the load, 4 - two minutes after taking the load off. Physical fitness was measured with the Sekita test. The analysis included the values of posture features to determine the significance of their differences and correlation with physical fitness to determine its relationship with the size of these differences. Conclusions. (1) The mode of carrying school items obliquely on the right or left shoulder and on different hips may cause significant adaptation changes in the skeletal and muscular system. It should be assumed that the bigger these changes are, the longer the carriage time is, the greater the mass of the container and the intensity of physical effort are. The changes are not gender specific. The analyzed carriage method should not be practiced among 7-year-old children of both sexes. (2) The overall fitness level shows a diversified relationship with changes in the values of postural traits as a result of the assumed carriage of school supplies. This relationship is bigger among boys. In case of girls, correlations are observed between endurance and the size of the inclination angle of the thoracic-lumbar spine. Among boys, all the features of physical fitness correlate most often with asymmetry of convexity of the lower angles of shoulder blades and the pelvic torsion in the transverse plane. The impact is gender dependent.