Dynamical Measurement Method of Handle Reaction Vector for FES-Assisted Paraplegic Walking     

明东万柏坤  胡勇王以忠  吴英华梁智仁 《天津大学学报(英文版)》2005,11(5):318-321

To analyze the use of upper limb support during paraplegic walking assisted by functional electrical stimulation （ FES）. a new dynamical measurement for handle reaction vector （HRV） applied by patient to walker was proposed. To avoid the discomfort of direct monitoring, the dynamometer system was designed based on 12 string-gauge bridges instrumented on a standard walker frame. The detailed positions of these bridges were determined according to the deformation distributions of the walker frame under different directional components of HRV. To adapt the system to quantitative and reliable measurement, a redundant-optimized technique was developed in calibration. The measurement accuracy, nonlinearity, and crosstalk of the designed system were investigated, which were better than 1.01%. 2.91%. and 3. 19% respectively. Clinical trials were done with 6 paraplegic subjects using the system and one case was given as the example of actual measurement. All experiment and clinical trial results show that this method is reliable and practicable.  相似文献   

Novel Walking Stability-Based Gait Recognition Method for Functional Electrical Stimulation System Control     

明东 万柏坤胡勇  汪曣王威杰  吴英华陆瓞骥 《天津大学学报(英文版)》2007,13(2):93-97

Gait recognition is the key question of functional electrical stimulation (FES) system control for paraplegic walking. A new risk-tendency-graph (RTG) method was proposed to recognize the stability information in FES-assisted walking gait. The main instrument was a specialized walker dynamometer system based on a multi-channel strain-gauge bridge network fixed on the walker frame. During walking process, this system collected the reaction forces between patient's upper extremities and walker and converted them into RTG morphologic curves of dynamic gait stability in temporal and spatial domains. To demonstrate the potential usefulness of RTG, preliminary clinical trials were done with paraplegic patients. The gait stability levels of two walking cases with 4- and 12-week FES training from one subject were quantified (0.43 and 0.19) from the results of temporal and spatial RTG. Relevant instable phases in gait cycle and dangerous inclinations of patient's body during walking process were also brought forward. In conclusion, the new RTG method is practical for distinguishing more useful gait stability information for FES system control.  相似文献   

Cardiorespiratory and Perceptual Responses to Arm Crank and Wheelchair Exercise Using Various Handrims in Male Paraplegics     

G. William Gayle PhD  Roberta L. Pohlman  Roger M. Glaser  Glen M. Davis 《Research quarterly for exercise and sport》2013,84(3):224-232

Abstract

The purpose of the present study was to determine the effects of 10-in [025–m] versus 16-in [0.41-m] wheelchair handrims on cardiorespiratory and psychophysiological exercise responses during wheelchair propulsion at selected velocities. Fifteen male paraplegics (27.0 ± 5.5 yrs) performed three discontinuous exercise tests (ACE = arm crank ergometer; WERG = wheelchair roller ergometer) and two 1600-m performance-based track trials (TRACK) under simulated race conditions. There were no significant differences in HR, VO₂, V_E, HLa, or category-ratio ratings of perceived exertion (RPE) using different handrims during wheelchair propulsion at 4 km-h¹. In contrast, at 8 km-h^?1 subjects demonstrated a 13% lower steady state VO₂ (p < .05) using the 10-in handrims, coincident with a 23% lower V_E Steady state HR during WERG at 8 km-h^?1 using the 10-in (124.4 ± 39 b.min^?1) or 16-in (130.6 ± 4.6 b.min^?1) handrims were not significantly different. There were also no significant differences between ACE or WERG conditions during maximal effort for VO₂ or V_E. However, HRpeak during ACE was 7% higher than HRpeak during WERG16 (183 ± 15 b.min^?1 vs. 171 ± 12 b.min^?1, p < .05), and whole blood HLa during ACE was also significantly higher (by 2.3-2.5 mmol; p < .05) compared to WERG. There were no significant differences for HR, performance time, or RPE between trials using different handrim diameters during the 1600-m event. In contrast, HLa was significantly lower using smaller handrims (9.9 mmol) compared with larger handrims (11.3 mmol), paralleling a similar difference in the laboratory. Although these data demonstrated few significant differences of physiologic responses between trials using different handrims, there was a tendency for a lower metabolic stress using the smaller handrims.  相似文献