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Biomedical subjects

J G Thomas

Publications and source records attributed to J G Thomas.

17 recordsLinked to original sources
PubMed1992

Grip strength as a function of 200 repetitive trials.

A study was done to see how grip strength deteriorates after an extended number of grips. Eight male subjects, all right-handed and 23 to 35 years old, participated. Each subject made 200 grips on a dynamometer at his maximum strength. There were 15-sec. rests between trials. Performance dropped significantly after two trials. There were drops of about 40% and 50% at Trials 100 and 200, respectively. The grip strength/trial relationship is logarithmic as noted by Montazer and Thomas in 1991.

Adult↗
PubMed1991

Grip strength as a function of repetitive trials.

An experiment on repetitive hand-gripping tasks was conducted to determine the functional relationship between the maximum grip strength and number of trials. Nine male subjects performed 30 gripping trials at their maximum strengths with 15-sec. rests between trials. Performance dropped significantly after two trials. Over-all, there was a 30% drop in maximum grip strength after 30 trials. The decrease in strength over trials is described by a logarithmic function.

Adult↗
PubMed1991

Automatic measurements of fetal long bones. A feasibility study.

We investigated whether it would be possible for a computer to propose values for measurements commonly obtained (femur and humerus) during obstetrical sonography. In this preliminary study, the images were scanned and analyzed off-line using morphological operators. The procedure described allowed us to measure the long bones and has a very high coefficient of correlation with measurements obtained by humans. Ideally, the whole procedure could probably be part of the computer instructions that are built into the machine.

Algorithms↗
PubMed1987

Oxfendazole pulse release intraruminal devices and bovine parasitic bronchitis: comparison of two control strategies in a field experiment.

Lungworm-infected seeder calves were used on two 1.41 ha paddocks to ensure that groups of 11 susceptible trial calves would be exposed to heavy early season challenge with Dictyocaulus viviparus. This produced conditions for an artificially severe test of two control strategies. The first employed a front-loaded oxfendazole pulse release bolus, ie, an intraruminal device which released one therapeutic anthelmintic dose immediately and five subsequent pulses at approximately three-weekly intervals. These front-loaded boluses were given to five of 11 calves on one paddock as soon as parasitic bronchitis had become clinically obvious (34 days after turnout) while the remaining six calves were kept as untreated controls. Clinical signs quickly subsided in the treated animals and no further respiratory problems occurred despite continued exposure to reinfection. The other control strategy involved the administration at turnout of an oxfendazole pulse release device which released the first of five anthelmintic doses approximately three weeks after administration, to all 11 calves on the other paddock. This strategy was almost completely successful in preventing patent infections from establishing and reduced the infectivity of the pasture in August and September by 94.1 per cent as shown by tracer calf studies. The calves treated at turnout performed better than the calves treated with the front-loaded boluses for most of the season and had an average weight-gain advantage of 20.4 kg at housing (P less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1977

The ocular microtremor record and the prognosis of the unconscious patient.

Ocular microtremor was recorded in 41 healthy subjects and 70 unconscious patients. Abnormalities of frequency and pattern were found in all the unconscious patients, the degree of abnormality being related to outcome. The ocular microtremor record is a potential aid to prognosis in the unconscious patient.

Adolescent↗
PubMed1977

Micro-tremor of the eyes of comatose patients.

An electronic method has been used to record the micro-tremor of the eyes of a group of comatose patients. Changes in the micro-tremor waveform patterns have been observed in successive records taken over a period of several days. These changes have been associated with changes in the depth of coma.

Action Potentials↗
PubMed1977

The ocular microtremor record as a potential procedure for establishing brain death.

The normal ocular microtremor possesses certain characteristics. Abnormal records are found in unconscious patients. Six patients with clinical manifestations of brain death showed complete absence of ocular microtremor when it was recorded shortly before death. A seventh patient who had taken an overdose of barbiturates had a virtually flat record which gradually improved as her coma lightened. The ocular microtremor record is proposed as a potential monitor of brain stem viability or death.

Adult↗
PubMed1976

Clinical diagnosis of Down's syndrome.

A physical examination checklist of 25 signs of Down's syndrome was used to predict the presence of absence of 21-trisomy in 291 individuals examined for suspected Downs syndrome. Using only total numbers of signs present, 21-trisomy was unambiguously predicted in about half those examined. Discriminant analysis using the most informative 10 signs misclassified only 11 of 169 infants aged 2 years or less, and allowed non-overlapping classification into Down's and non-Down's of almost three-fourths of suspected individuals. The risk for Down's syndrome in the overlap area was 58%.

Child, Preschool↗
PubMed1975

An investigation of the correlation between abnormal patterns of ocular microtremor and an abnormal pupil reflex in neurological patients.

Twenty-two patients and 7 normal subjects at the Burdenko Institute of Neurosurgery, Moscow, have taken part in an investigation in which the direct light reflex to a brief flash, and the high-frequency microtremor of the eyes, have been recorded. The direct pupil reflex recordings obtained with a flash of 20 msec duration and 100 lux intensity at the plane of the pupil were registered from the right eye of each patient. Ocular microtremor recordings were obtained simultaneously from both eyes of 20 of the patients. A set of criteria of abnormality of ocular microtremor, as judged by visual examination of the records, is proposed by the authors. Abnormality of the pupil reflex is assessed in terms of the amplitude, latent period, and time course of the contraction and relaxation phases of the reflex. A strong correlation has been found between the occurrence of an abnormal ocular tremor record and an abnormal pupil reflex. On the basis of this correlation, the authors propose that ocular tremor recordings may be used in diagnosis as sensitive indicators of brain-stem dysfunction.

Brain Diseases↗
PubMedDate not supplied

Helping nurses adjust. Who provides what job information?

Nurses' perceptions of their jobs are influenced by information provided by others, who often are labeled role models. This study suggests that role models are not limited to co-workers and preceptors as implied in previous research. Nurses' evaluations of job satisfaction, job attitudes, and the appeal of other professions is influenced by information provided by co-workers, supervisors, preceptors, family, friends, patients, and physicians. Although all employees appear to be influenced to some degree by information from others, new employees appear most prone to use information from others to shape feelings, attitudes, and job behavior.

Adaptation, Psychological↗