https://etalpykla.vilniustech.lt/handle/123456789/153949 2026-04-18T08:19:48Z https://etalpykla.vilniustech.lt/handle/123456789/153981 Challenges in adapting technical assistive products individually for people with mobility disabilities Ogurcova, Ilona 2016-01-01T00:00:00Z https://etalpykla.vilniustech.lt/handle/123456789/153975 The study of extraneous conditions that affect tilt-based pointer movements Serackis, Artūras; Miniotas, Darius; Katkevičius, Andrius; Krukonis, Audrius; Plonis, Darius Introduction: With the rapid evolution of mobile devices, there is also a tremendous growth in their applications. This triggers new research on more efficient techniques of human-computer interaction. To point at an object of interest seen on the screen of a mobile device, various new methods were suggested recently. Methods: This paper presents the results of a user study that employed tilting as a technique for entering text. The independent variables in the user study were mobility (sitting, walking, sitting in the moving bus) and keyboard size (5×3, 10×4). The experiment involved 50 participants aged from 22 to 65. Results: In the walking condition, it took on average 11.3% more time for participants to complete the task compared to the sitting condition with 5×3 keyboard, and 45.1% more time compared to the sitting condition with 10×4 keyboard. Keyboard size had a marked influence on task completion time. In addition, task completion time while traveling by bus was 3.2% longer than that observed for the walking condition with 5×3 keyboard. Surprisingly, task completion time with 10×4 keyboard while traveling by bus was 10.4% shorter compared to the walking condition. Error rate and movement efficiency were investigated additionally to find out the explanation for such performance data. 2016-01-01T00:00:00Z https://etalpykla.vilniustech.lt/handle/123456789/153974 Estimation of the parameters of barbell’ lifting law of motion Mariūnas, Mečislovas; Griškevičius, Julius; Jonaitis, Gintaras Characteristic points of the law of motion were determined based on the results of experimental study on the velocities and accelerations of the lifted barbell. Relationship between the height of the athlete, lifted weight, maximal velocity and acceleration was estimated analytically. It was shown, that at the initial time moment the athlete must apply approximately 1,5 times larger force than lifted weight. The values of the parameters of the barbell’ law of motion and lifting force approximate law of change were estimated. 2016-01-01T00:00:00Z https://etalpykla.vilniustech.lt/handle/123456789/153973 The influence of barbell’s weight, lifting technique and skills on weightlifter’s blood pressure and heart rate Mariūnas, Mečislovas; Griškevičius, Julius; Jonaitis, Gintaras Article presents hodographs of the arterial blood pressure relation to heart-rate enabling to evaluate organism sensitivity of trained weightlifter to the magnitude of lifted weight, lifting technique and weight repeatability. Variation regularities of the latter relation have been explained and approximate criterions of relative stability and skill level were formulated. Analysing variations of the relation of the arterial blood pressure to the heart-rate and barbell’s lifting accelerations and velocities the weaknesses of trained weightlifters have been explained. It has shown that in most cases the blood pressure of the weightlifter can increase 8–13% after the barbell drop. 2016-01-01T00:00:00Z