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 - Pilissy, Tamás AU - Klauber, András AU - Fazekas, Gábor AU - Laczkó, József AU - Szécsi, J TI - Improving functional electrical stimulation driven cycling by proper synchronization of the muscles JF - IDEGGYOGYASZATI SZEMLE / CLINICAL NEUROSCIENCE J2 - IDEGGYOGY SZEMLE VL - 61 PY - 2008 IS - 5-6 SP - 162 EP - 167 PG - 6 SN - 0019-1442 UR - https://m2.mtmt.hu/api/publication/1857173 ID - 1857173 AB - Our aim is to define optimal stimulation patterns for controlling lower limb movements of spinal cord injured patients. Here we report on a study about cycling movements of healthy subjects under regular conditions and spinal cord injured patients whose cycling movement was generated by functional electrical stimulation. The stimulation pattern required for coordinated activities of lower limb muscles of spinal cord injured patients was improved by using the observations what we gained from measuring and analyzing cycling movements of 42 young healthy subjects. Kinematical parameters (joint angles) and muscle activities (EMG) were recorded simultaneously by an ultrasound based movement analyzing system. We replaced the cycling program of the commercially available stimulator with a new one that we developed on the basis of the measured healthy cycling movements. We present that our new stimulation patterns provided a great increase in the performance of our spinal cord injured patients. LA - English DB - MTMT ER - TY - JOUR AU - Laczkó, József AU - Keresztényi, Z TI - Variances of Hand Positions and Arm Configurations During Arm Movements Under External Load and Without External Load JF - MOTOR CONTROL J2 - MOTOR CONTROL VL - 11 PY - 2007 IS - Supplement SP - S127 SN - 1087-1640 UR - https://m2.mtmt.hu/api/publication/1861130 ID - 1861130 N1 - Progress in Motor Control VI LA - English DB - MTMT ER - TY - JOUR AU - Domkin, D AU - Laczkó, József AU - Djupsjöbacka, M AU - Jaric, S AU - Latash, ML TI - Joint angle variability in 3D bimanual pointing: uncontrolled manifold analysis JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 163 PY - 2005 IS - 1 SP - 44 EP - 57 PG - 14 SN - 0014-4819 DO - 10.1007/s00221-004-2137-1 UR - https://m2.mtmt.hu/api/publication/140416 ID - 140416 LA - English DB - MTMT ER - TY - JOUR AU - Laczkó, József AU - Walton, K AU - Llinas, R TI - A neuro-mechanical transducer model for controlling joint rotations and limb movements JF - CLINICAL NEUROSCIENCE RESEARCH J2 - CLIN NEUROSCI RES VL - 59 PY - 2005 IS - 1-2 SP - 32 EP - 43 PG - 12 SN - 1566-2772 UR - https://m2.mtmt.hu/api/publication/140377 ID - 140377 LA - English DB - MTMT ER - TY - JOUR AU - Horváth, Mónika AU - Fazekas, Gábor TI - Mozgáskárosodás felmérése elektromiográfiával - a kineziológiai EMG [Assessment of motor impairment with electromyography--the kinesiological EMG] JF - IDEGGYOGYASZATI SZEMLE / CLINICAL NEUROSCIENCE J2 - IDEGGYOGY SZEMLE VL - 56 PY - 2003 IS - 11-12 SP - 360 EP - 369 PG - 10 SN - 0019-1442 UR - https://m2.mtmt.hu/api/publication/1816138 ID - 1816138 AB - Kinesiological electromyography means the application of the surface EMG measurement technique during movement and locomotion. The authors investigated the motor impairments of the upper limb of patients with spastic hemiparesis. Surface EMG activity in musculus biceps brachii and musculus triceps brachii were recorded during voluntary elbow flexion and extension movements. In some cases even the raw EMG signals contain the accurate information but more often the recorded signals should further be processed to achieve more valuable data concerning muscle performance. The limitations of the technique underlines the importance of the several steps of the processing. The purpose of this study is to present a systematic description of the methods and the precise application of surface EMG. The authors give a comprehensive view of different processing methods and demonstrate the application areas of the kinesiological EMG. LA - Hungarian DB - MTMT ER - TY - GEN AU - Laczkó, József AU - Walton, K AU - Llinas, R TI - A model for swimming motor control in rats reared from P14 to P30 in microgravity PY - 2003 UR - https://m2.mtmt.hu/api/publication/1053744 ID - 1053744 N1 - [Konferencia absztrakt] LA - English DB - MTMT ER - TY - JOUR AU - Domkin, D AU - Laczkó, József AU - Jaric, S AU - Johansson, H AU - Latash, ML TI - Structure of joint variability in bimanual pointing tasks JF - EXPERIMENTAL BRAIN RESEARCH J2 - EXP BRAIN RES VL - 143 PY - 2002 IS - 1 SP - 11 EP - 23 PG - 13 SN - 0014-4819 DO - 10.1007/s00221-001-0944-1 UR - https://m2.mtmt.hu/api/publication/139813 ID - 139813 LA - English DB - MTMT ER - TY - CHAP AU - Laczkó, József AU - Pellionisz, A AU - Jongen, H AU - Gielen, CCAM ED - Society, for Neuroscience TI - Computer Modeling of Human Forelimb Muscle Activation in Multidimensional Intrinsic Coordinate Frames T2 - Society for Neuroscience Abstracts: Volume 14, 18th Annual Meeting, Toronto, Ontario, November 13-18,1988, 2. rész PB - Society for Neuroscience CY - Toronto SN - 0916110303 PY - 1988 SP - 955 PG - 1 UR - https://m2.mtmt.hu/api/publication/2538957 ID - 2538957 LA - English DB - MTMT ER -