P-2-09-04
ACTIVITIES OF SINGLE HUMAN MOTOR UNITS AND THEIR ANGLES OF INITIAL FIRING ON TREADMILL WALKING
Yoshinori Ogawa*, Satoshi Miyano** and Kyozo Yonemoto** (*Dept. of Rehabilitation Medicine, Division of Physical Fitness and Sports Medicine. **Dept. of Rehabilitation Medicine, The Jikei University School of Medicine, Tokyo, Japan)
Purpose: This study was conducted to investigate the activities of single motor units and knee joint angles of their initial firing in vastus lateralis muscle during treadmill walking.
Methods: The experiments were carried out in two healthy subjects. Coil-shaped electrodes were inserted into the muscle to record the action potentials of single motor units. The treadmill speed ranged from 20 to 110 m/min.
Results: We made a comparison between the recruitment orders during walking and during isometric ramp contraction. The orders of motor units recruitment were different from those of isometric contraction. Each motor unit showed the characteristic range of angles at their initial firing on treadmill walking. Two kinds of motor units were observed on the knee joint angle when motor units fired. One changed related to the increment of the treadmill speed, and the other fired in constant range regardless to the treadmill speed.
Conclusion: It was suggested that the changes of knee joint have an effect on the activities of single motor units.
P-2-10-01
Prediction of Prognosis in Patients with Cerebral Palsy
Hitoshi Yokozeki, Masanosuke Nakashima, Sumito Nakamura, Teruyoko Fujimoto (Tokyo Metropolitan Kita Medical and Rehabilitation Center for the Handicapped, Tokyo, Japan)
We investigated the various items of 264 patients (179 male, 85 female) with cerebral palsy. They were more than 18 years old and followed up more than 15 years. The investigated items included the risk factors and general conditions in perinatal period, condition of health in infancy and childhood, evolution of infantile postural reflexes, development of various motor functions, IQ, epilepsy, dislocation of hip joint, scoliosis, orthopedic surgery, etc. We tried to predict their abilities in adult from these items by using the theories of quantification by HAYASHI (one of the multivariate analysis). To hold the head upright on the elbow position and to turn over until 3 years old were important items to predict adult locomotor ability, and we can predict it in probability more than 90%. To crawl until 3 years old was important to predict gait ability and the beginning time of gait and IQ in childhood were important to do economic independence. We can predict them in probability more than 80%. To crawl and IQ were important to predict the level of ADL.
