engleski

ANGLE VALUES AS KINEMATIC PARAMETERS FOR DESCRIBING MOVEMENT ON SKI SIMULATOR

Alpine skiing as a winter sport is limited by the specific conditions in which it can be performed. Due to mentioned, athletes and recreational skiers are trying to find alternative activities that can replace snow conditions but are biomechanically similar. Moreover, it is desirable that during mentioned activities, like in alpine skiing, muscles are predominantly eccentrically activated. The PRO SKI SIMULATOR is a possible alternative. It is an exercise machine on which an athlete can perform specific motion biomechanically similar to carving turn performed on an actual ski slope along with predominantly eccentrically activated muscles. The purpose of this study is to measure the kinematic parameters and describe biomechanical model using the MVN BIOMECH XSENS inertial suit while participant performs simulation of the carving turn on the simulator. Participant is a male ski instructor. Kinematic variables that were used are joint angles (ankle, knee, hip, shoulder, elbow), measured in degrees (°), and height of centre of mass measured in centimetres (cm). MVN BIOMECH XSENS inertial suit consists of seventeen wireless motion trackers. It ensures real-time human motion analysis. After adjusting the suit and calibration of the system, participant performs sixteen cycles of turn in each side. PRO SKI SIMULATOR has option of adjusting the resistance by using six springs. Adding each spring resistance increases matching the weight interval of an athlete. In this case resistance of three springs was used. Basic descriptive parameters were calculated for all variables. Variables ADLRT and ADRLT are significantly different (p=0, 00) ; also variables HALRT and HARLT differ (p=0, 00). Statistically different is angle of flexion in the outer knee joint (KFLRT, KFRLT) p=0, 00 ; shoulder joint in the abduction (SALRT, SARLT- p=0, 00) and flexion (SFLRT, SFRLT- p=0, 00). Also to be noted is the difference between elbow flexion (EFLRT, EFRLT- p=0, 00). We did not find significant difference between outer hip angle of flexion (HFLRT, HFRLT- P=0, 58). Height of the center of the mass in right turn was not statistically different from height of the center of the mass in left turn (COMR, COML- p=0, 68). From the all obtained results it is possible to conclude that participant does not have the same quality of the left and right turn. The future studies should concentrate on using a kinematic suit but on an actual slope and compare that parameters with ones obtained in this study during laboratory conditions.

Ski simulation, kinematic suit, alpine skiing, biomechanics, rhythm, balance

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