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Biomedical subjects

G D Powell

Publications and source records attributed to G D Powell.

6 recordsLinked to original sources
PubMed1998

Successful prosthetic fitting of a 73-year-old hip disarticulation amputee patient with cardiopulmonary disease.

Patients with hip disarticulation (HD) require high energy expenditure for successful prosthetic ambulation. Thus, older patients are rarely fitted with an HD prosthesis. To our knowledge there are no reports of gait analysis following successful prosthetic fitting of an elderly HD amputee patient with systemic cardiopulmonary disease. We report the case of successful prosthetic ambulation in a 73-year-old man with HD secondary to histiosarcoma and a medical history significant for stable angina, chronic obstructive pulmonary disease, and diabetes mellitus. The patient underwent gait training with an endoskeletal prosthesis and achieved ambulation to 400 feet with bilateral forearm crutches. Vicon kinematic gait analysis revealed a cadence of 44 steps/min (112 steps/min normal), and double support time of 47% (26% normal). Oxygen rate during ambulation (VO2) was 11.0 mL/kg/min at velocity of .35 m/sec, compared with published figures for ambulation in those with HD of 10.73 mL/kg/min at velocity of .93 m/sec. At 1-year follow-up, the patient continued to walk into church with the prosthesis. We conclude that a trial fitting of an HD prosthesis should be considered on an individual basis in elderly amputee patients.

Activities of Daily Living↗
PubMed1994

Electrodiagnosis. An overview.

Electrodiagnostic consultation is a highly sensitive mechanism for the podiatrist to obtain functional information about the peripheral nervous system in the lower extremity. This article discusses the basic components of the electrodiagnostic consultation and the information that can be obtained through this testing. Additionally, it provides the podiatrist with guidelines for requesting consultation and interpreting the results.

Action Potentials↗
PubMed1993

The effect of command emphasis and monthly physical training on Army physical fitness scores in a National Guard Unit.

Individual fitness, an important component of combat readiness, has been found to be deficient in some Reserve Component units of the United States Army. We evaluated a program of monthly physical training in an environment of increasing emphasis on unit physical fitness in an effort to determine the effect on unit performance on the semi-annual Army Physical Fitness Test (APFT). This program was examined in a retrospective manner to establish its effectiveness over a 6-month period. No statistically significant improvement in APFT scores could be found over the course of the study, suggesting that such a program is not an efficient means of improving unit fitness in the Reserve Components of the United States Army.

Adult↗
PubMed1992

The effect of different needle recording electrodes on somatosensory-evoked potentials and intertrial waveform variation.

This investigation examined the cortical somatosensory-evoked potentials (SEP) waveforms obtained from four sets of commercially available subdermal needle electrodes in 19 normal subjects. The composite materials of the four electrodes were stainless steel and a platinum/iridium alloy. Tibial nerve SEP peak latencies for P37 and N45 as well as P37/N45 amplitudes were recorded from each electrode pair in a random fashion. Using nonparametric analysis, no significant differences of waveform parameters were found between electrode pairs (P greater than 0.01). Correlation evaluation demonstrated values in excess of 0.92. Additionally, intertrial waveform analysis for each of the electrode pairs was performed. Again, nonparametric evaluation demonstrated no statistically significant waveform differences. Correlation coefficients were also highly correlative. Variable temperature response to prolonged tibial nerve stimulation was recorded that did not significantly effect the latencies or amplitudes of the cortical SEP responses. We conclude that within temperature ranges typically encountered in clinical practice, there is no statistically significant waveform differences recorded with commonly available subdermal needle electrodes. Additionally, although intertrial waveform variation may exist during SEP recordings, these differences do not reach statistically significant levels.

Adult↗