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American journal of physical medicine最新文献

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Effect of myoelectric signal processing on the relationship between muscle force and processed EMG. 肌电信号处理对肌力与处理后肌电图关系的影响。
American journal of physical medicine Pub Date : 1985-06-01
S Siegler, H J Hillstrom, W Freedman, G Moskowitz
{"title":"Effect of myoelectric signal processing on the relationship between muscle force and processed EMG.","authors":"S Siegler,&nbsp;H J Hillstrom,&nbsp;W Freedman,&nbsp;G Moskowitz","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The relationship between the force generated by an isometrically contracting muscle and the associated myoelectric signal has been the subject of extensive investigation in the past and conflicting results were reported regarding this relationship. The objective of the present study was to investigate some of the sources that may lead to such conflicting results. Two possible sources were examined. The first was the variability in the force-EMG relationship resulting from processing the EMG signal with different EMG signal processing techniques and the second was the variability in the force-EMG relation obtained from repeated muscle contractions. The results of the study indicate that slight variations in the force-EMG relationships can be attributed to the selection of different processing techniques. However, the variability in the force-EMG relation, obtained by using different EMG signal processors, was found to be significantly smaller than the variability in this relationship obtained from repeated muscle contractions.</p>","PeriodicalId":75477,"journal":{"name":"American journal of physical medicine","volume":"64 3","pages":"130-49"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15118466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Motion of the center of gravity of the body in clinical evaluation of gait. 身体重心运动在临床步态评价中的应用。
American journal of physical medicine Pub Date : 1985-04-01
L Tesio, P Civaschi, L Tessari
{"title":"Motion of the center of gravity of the body in clinical evaluation of gait.","authors":"L Tesio,&nbsp;P Civaschi,&nbsp;L Tessari","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The motion of the center of gravity during walking was analyzed in five hemiplegic subjects and eleven subjects affected by unilateral hip arthritis. In the hemiplegic subjects and 6 subjects with hip arthritis the transfer between kinetic and potential energy (with a passive pendular motion) was found to be 9-95% greater during the step performed on the affected limb (\"pathological\" step); as a consequence, the muscular work done during this step was 7-81% of the work done during the step performed on the second limb (\"normal\" step). Qualitatively similar gait anomalies were recorded in all hemiplegic subjects with hypertonus of the paretic limb: these subjects had to lift the spastic limb as a whole during the normal step, with the consequence that the center of gravity was lifted 0.6-3 cm more than during the pathological step. In contrast, various motor patterns were found in patients with hip arthritis. During the pathological step the center of gravity reached a height 0.5-3 cm greater in 7 subjects, 1 cm smaller in one subject, and about the same height reached during the normal step in 3 subjects. This was consistent with the various motor deficits caused by hip arthritis.</p>","PeriodicalId":75477,"journal":{"name":"American journal of physical medicine","volume":"64 2","pages":"57-70"},"PeriodicalIF":0.0,"publicationDate":"1985-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15109374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Changes with age in monosynaptic reflexes elicited by mechanical and electrical stimulation. 机械和电刺激引起的单突触反射随年龄的变化。
American journal of physical medicine Pub Date : 1985-04-01
H A deVries, R A Wiswell, G T Romero, E Heckathorne
{"title":"Changes with age in monosynaptic reflexes elicited by mechanical and electrical stimulation.","authors":"H A deVries,&nbsp;R A Wiswell,&nbsp;G T Romero,&nbsp;E Heckathorne","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Absence of the achilles tendon reflex (T) has been reported to increase with age. Other investigators have reported no age relationship. Age changes in the Hoffmann reflex (H) have been examined in only one recent investigation. It was our purpose to compare the T and H reflexes of healthy, active old (n = 20) against young (n = 20) subjects using methods which provide stimulus-response data for both T and H. We also compared the age differences of H against T to estimate fusimotor involvement in age changes. No significant age difference were found in the response:stimulus ratio for T. Amplitude of H responses were 32.7 percent smaller in the old (P less than 0.04) and M waves were smaller by 24 percent (P less than 0.025). No significant age difference was found between mechanically and electrically elicited reflexes; and, therefore, our data do not support fusimotor involvement in the age changes of monosynaptic reflexes.</p>","PeriodicalId":75477,"journal":{"name":"American journal of physical medicine","volume":"64 2","pages":"71-81"},"PeriodicalIF":0.0,"publicationDate":"1985-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15109376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Gait analysis in amputees. 截肢者的步态分析。
American journal of physical medicine Pub Date : 1985-04-01
H B Skinner, D J Effeney
{"title":"Gait analysis in amputees.","authors":"H B Skinner,&nbsp;D J Effeney","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>There are marked differences from normal in both AK and BK gait. Forward velocity of walking is significantly lower in the amputee and is lower in the AK than in the BK subjects. Traumatic AK amputees ambulate with time-distance parameters of velocity, cadence, stride length and gait cycle which are all two standard deviations below normal. The same parameters for the traumatic BK amputee are only one standard deviation below normal. The symmetry of walking seen in the normal subject is not present in the lower extremity amputee. Measurements of single limb support times and motion analysis of the lower extremities as well as of the head, arms and trunk bear this out. This asymmetry of motion increases the excursion of the center of mass during each cycle and thereby increases the energy cost of ambulation. Energy cost of amputee gait often places the dysvascular AK amputee at his limits and strains other amputees severely. Further research is necessary to enable amputees to approach the walking capabilities of normal people.</p>","PeriodicalId":75477,"journal":{"name":"American journal of physical medicine","volume":"64 2","pages":"82-9"},"PeriodicalIF":0.0,"publicationDate":"1985-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15002938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Orthodromic sensory nerve conduction of the medial and lateral plantar nerves. A standardization. 直立感觉神经传导的内侧和外侧足底神经。一个标准化。
American journal of physical medicine Pub Date : 1985-02-01
J Belen
{"title":"Orthodromic sensory nerve conduction of the medial and lateral plantar nerves. A standardization.","authors":"J Belen","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A standardized method of obtaining orthodromic distal sensory latencies of the medial and lateral plantar nerves is presented. Forty-one normal volunteer subjects were tested. Stimulation is carried out on the plantar aspect of the base of each toe using ring electrodes. Surface recording electrodes are placed posterior to the medial malleolus over the tarsal tunnel at points measuring 14, 16, 18 and 20 centimeters from the dorsum of the base of the great toe. Sixty-four evoked responses were averaged utilizing an electronic averaging technique and temperature was maintained at 31 degrees centigrade. Mean and standard deviation values of the distal sensory latency are reported for each toe. The reliability and ease in performance of these conduction studies will make them necessary and useful aids in the electrodiagnostic evaluation of tarsal tunnel syndrome, peripheral neuropathies and other local neuropathic conditions. Case studies are presented demonstrating the usefulness of this testing.</p>","PeriodicalId":75477,"journal":{"name":"American journal of physical medicine","volume":"64 1","pages":"17-23"},"PeriodicalIF":0.0,"publicationDate":"1985-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15082839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of therapeutic ultrasound intensity on subcutaneous tissue temperature and ulnar nerve conduction velocity. 治疗性超声强度对皮下组织温度及尺神经传导速度的影响。
American journal of physical medicine Pub Date : 1985-02-01
J F Kramer
{"title":"Effect of therapeutic ultrasound intensity on subcutaneous tissue temperature and ulnar nerve conduction velocity.","authors":"J F Kramer","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Twenty subjects completed 5 min. periods of sonation, at each of six US intensities, over the ulnar nerve in the proximal forearm. All posttreatment NCV's differed significantly from the respective pretreatment velocities. The immediate posttreatment NCV associated with placebo US was significantly (p less than 0.01) less than that observed immediately pretreatment (2.81 m/s), while the five clinical US intensities produced significantly increased immediate posttreatment velocities: 0.5 w/cm2 (2.23 m/s) at (p less than 0.05), and 1.0 w/cm2 (2.78 m/s), 1.5 w/cm2 (3.15 m/s), 2.0 w/cm2 (4.47 m/s) and 2.5 w/cm2 (2.97 m/s) at (p less than 0.01). The posttreatment velocities associated with the five clinical intensities were all significantly greater (p less than 0.01) than that associated with placebo US. Subcutaneous tissue temperatures were directly related to the intensity of US. Not until US intensity had reached 1.5 w/cm2 did the heating effect of US negate the cooling effect of the US transmission gel, to produce significantly increased subcutaneous tissue temperatures after 5 min. sonation. The decreased ulnar motor NCV's associated with placebo US are attributed to the cooling effect of the US transmission gel. The increased ulnar motor NCV's associated with the clinical intensities of US are attributed to the deep heating effect of US. The breakdown of this linear relationship at 2.5 w/cm2 intensity suggests that at this point heating on the nerve and/or the mechanical effects of US were of sufficient magnitude so as to limit the increase in conduction velocity. Sonation over an area of approximately 4.5 times the soundhead for 5 min., along the proximal forearm, at clinical intensities did not have a bipositive effect on motor NCV.</p>","PeriodicalId":75477,"journal":{"name":"American journal of physical medicine","volume":"64 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"1985-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15085291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Short latency somatosensory evoked potentials during active hand movements. 手部活动时的短潜伏期体感诱发电位。
American journal of physical medicine Pub Date : 1985-02-01
I M Tarkka, H T Teräväinen
{"title":"Short latency somatosensory evoked potentials during active hand movements.","authors":"I M Tarkka,&nbsp;H T Teräväinen","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>This study was designed to investigate the effect of active movement on spinal and cortical evoked responses. During voluntary hand movements the cervical and cortical short latency somatosensory evoked potentials (SEP) elicited by stimulation of the median nerve at the wrist were studied in nine healthy subjects. The latencies of the SEPs were not affected by active movements whereas the peak to peak amplitudes of the main cervical (N13-P15) and the main cortical (N20-P25) deflections were significantly reduced. The cortical subcomponents (N16 and N17), probably reflecting thalamic and thalamocortical activity, were not significantly affected by movements. The amplitude reductions in the cervical and cortical recordings might be related to proprioceptive feedback from the muscle afferents.</p>","PeriodicalId":75477,"journal":{"name":"American journal of physical medicine","volume":"64 1","pages":"10-6"},"PeriodicalIF":0.0,"publicationDate":"1985-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15085292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Predicting outcome of group counseling with severely disabled patients. 重度残疾患者团体咨询效果预测。
American journal of physical medicine Pub Date : 1985-02-01
R L Evans, L Kleinman, E M Halar, K Herzer
{"title":"Predicting outcome of group counseling with severely disabled patients.","authors":"R L Evans,&nbsp;L Kleinman,&nbsp;E M Halar,&nbsp;K Herzer","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Client characteristics associated with outcome of group counseling were identified in a sample of physically disabled persons using standardized self report inventories. Thirty-eight subjects were tested before and after an 8 week treatment interval for signs of emotional disorder, inactivity, and social problems related to being severely disabled. Treatment consisted of group conference phone calls using self determined task assignments as a focus for discussion. Change in report of life satisfaction was predicted reliably from pretest data. Loneliness accounted for 73% of the variance in posttreatment life satisfaction scores. Other significant predictors included signs of depression, alcohol use, and constructs related to social support. Using regression analysis, persons with adjustment problems could be identified and prognosis for treatment predicted with acceptable reliability.</p>","PeriodicalId":75477,"journal":{"name":"American journal of physical medicine","volume":"64 1","pages":"24-31"},"PeriodicalIF":0.0,"publicationDate":"1985-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14286460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electromyographic patterns accompanying isokinetic exercise under varying speed and sequencing conditions. 在不同速度和顺序条件下等速运动的肌电图模式。
American journal of physical medicine Pub Date : 1984-12-01
L R Osternig, J Hamill, D M Corcos, J Lander
{"title":"Electromyographic patterns accompanying isokinetic exercise under varying speed and sequencing conditions.","authors":"L R Osternig,&nbsp;J Hamill,&nbsp;D M Corcos,&nbsp;J Lander","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The purposes of this study were: a) to investigate electromyographic patterns accompanying isokinetic exercise under varying speed and sequencing conditions, and b) to investigate the role of antagonist coactivation under these same conditions. Five adult males performed maximal knee extensions and flexions on a modified Orthotron isokinetic dynamometer. Tests were done at four speeds (100-400 degrees/sec) and under two counterbalanced conditions: extension followed by flexion (E/F) and flexion followed by extension (F/E). Simultaneous recordings of torque, knee joint position and agonist/antagonist EMG changes from the quadriceps and hamstring musculature were collected and analyzed. No consistent EMG patterns emerged that inferred intermittent surges of muscular activity as the primary mechanism yielding double peaked torques that characteristically occur in isokinetic exercise. Further analyses revealed relatively small co-contractions of antagonists during the various phases of movement. The findings suggest that gravity and inertia of the limb/lever system were the major factors responsible for limb deceleration and substantive antagonist co-contraction was not required for braking. If isokinetic knee flexion and extension exercises are used for conditioning or developmental purposes of healthy subjects, any distraction of the co-contracting antagonist from the recorded force of the agonist appears to be small once the activity is learned.</p>","PeriodicalId":75477,"journal":{"name":"American journal of physical medicine","volume":"63 6","pages":"289-97"},"PeriodicalIF":0.0,"publicationDate":"1984-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17565684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bilateral wrist dislocation in an above knee amputee with advanced rheumatoid arthritis. Attempts at ambulation. 双侧腕关节脱位，膝上截肢患者伴晚期类风湿关节炎。尝试走动。
American journal of physical medicine Pub Date : 1984-12-01
A J Dorto, S M Green
{"title":"Bilateral wrist dislocation in an above knee amputee with advanced rheumatoid arthritis. Attempts at ambulation.","authors":"A J Dorto,&nbsp;S M Green","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The ambulatory difficulties of a patient with long standing rheumatoid arthritis with an above knee amputation and bilateral wrist dislocations has not been previously reported. Although wrist fusion did in fact increase his hand strength, control and stability, he still lacked sufficient hand strength and grip to don and doff the prosthesis, nor could he use assistive devices in order to become an independent ambulator. The results of wrist fusion and attempts at ambulation are discussed.</p>","PeriodicalId":75477,"journal":{"name":"American journal of physical medicine","volume":"63 6","pages":"298-302"},"PeriodicalIF":0.0,"publicationDate":"1984-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17565685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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