TY  - JOUR
AU  - Keresztenyi, Z
AU  - Cesari, P
AU  - Fazekas, Gábor
AU  - Laczkó, József
TI  - The relation of hand and arm configuration variances while tracking geometric figures in Parkinson's disease: aspects for rehabilitation
JF  - INTERNATIONAL JOURNAL OF REHABILITATION RESEARCH
J2  - INT J REHABIL RES
VL  - 32
PY  - 2009
IS  - 1
SP  - 53
EP  - 63
PG  - 11
SN  - 0342-5282
DO  - 10.1097/MRR.0b013e32830d369c
UR  - https://m2.mtmt.hu/api/publication/1854524
ID  - 1854524
AB  - Variances of drawing arm movements between patients with Parkinson's disease and healthy controls were compared. The aim was to determine whether differences in joint synergies or individual joint rotations affect the endpoint (hand position) variance. Joint and endpoint coordinates were measured while participants performed drawing tasks. Variances of arm configurations and endpoints were computed and statistically analyzed for 12 patients and 12 controls. The variance of arm movements for patients (both for arm configuration and endpoint) was overall higher than that for the control group. Variation was smaller for drawing a circle versus a square and for drawing with the dominant versus the nondominant hand within both groups. The ratio of arm configuration variances between groups was similar to the ratio of endpoint variances. There were significant differences in the velocity, but not in the path lengths of movements comparing the two groups. Patients presented less movement stability while drawing different figures in different trials. Moreover, the similarity of the ratios suggests that the ill-coordinated hand movement was caused by the error in the movements of individual body parts rather than by the lack of intersegmental coordination. Thus, rehabilitation may focus on the improvement of the precision of individual joint rotations.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Jánossy, Lajos
TI  - The penetrating power of cosmic-ray shower particles
JF  - MATHEMATICAL PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY
J2  - MATH PROC CAMBRIDGE
VL  - 34
PY  - 1938
IS  - 4
SP  - 614
EP  - 619
PG  - 6
SN  - 0305-0041
DO  - 10.1017/S0305004100020636
UR  - https://m2.mtmt.hu/api/publication/31942070
ID  - 31942070
LA  - English
DB  - MTMT
ER  -