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Biomedical subjects

J E Fernandez

Publications and source records attributed to J E Fernandez.

28 records · Page 2Linked to original sources
PubMed1991

Psychophysical lifting capacity over extended periods.

The effect of time on an individual's lifting capacity over extended periods using a psychophysical approach was studied. Twelve male subjects estimated their lifting capacity in a 25 min period, and then attempted to lift this weight for an 8 h period under varying conditions. For one experimental condition the subjects were allowed to adjust the weight, the final adjusted maximum acceptable weight of lift (MAWOL) averaged 85.4% of the original MAWOL determined in the 25 min session. The subjects also attempted to lift for an 8 h period, without any weight adjustments. All 12 subjects lasted the 8 h at 2 lifts per min, but at a frequency of 8 lifts per min only three subjects completed the eight hour lifting task. This indicates that the psychophysical approach is a valid method to measure lifting capacity across the lower lifting frequency range but overestimates the lifting capacity at the higher frequency range. Slight fluctuations were noted in heart rate and oxygen consumption which were recorded every hour.

Adult↗
PubMed1990

Physiological capacities of individuals with cerebral palsy.

The physical work capacity (PWC) and the physiological response to stimulated tasks of nine ambulatory individuals with cerebral palsy (CP) were studied. Energy demand for each work task was determined by percentage of PWC (%PWC). Results demonstrated significant differences in energy demand attributed to frequency and mode of lift regardless of gender. No significant difference for energy demand, however, was seen for load lifted. The %PWC for several tasks was near or above the accepted limit for an eight-hour workday, suggesting that the subjects were performing close to their physical limits or higher and would possibly experience fatigue before the eight-hour workday ended. The results also indicated that the PWC of subjects in this study was inferior to that of their nondisabled peers.

Arousal↗
PubMed1989

Anthropometry of Korean female industrial workers.

This paper presents the results of an anthropometric survey conducted on Korean female workers in the garment industry. The data was collected as part of a project to modify work stations that utilized equipment from other countries. A set of 23 body dimensions were taken from a sample of 101 workers (aged 18-28 years). The anthropometric measurements are presented and compared with those of the Western and Japanese female. The results indicate that the body dimensions of the Korean female are different from those of both the Western and the Japanese female. The ratio of sitting height to standing height for the Korean female is closer to that of the Western female than it is the Japanese female.

Adult↗
PubMed1988

Morphometric study of right ventricle in 32 cases of tetralogy of Fallot.

The right ventricle was the object of a morphometric study in a total of 32 human hearts with tetralogy of Fallot. Most subjects died in the perinatal period and weighed between 720 and 5,000 g. Nine internal parameters were measured in each right ventricle and substituted into the appropriate stereometric formula to yield volumes for each right ventricular chamber. The data obtained were compared to patterns of normality previously obtained by mathematical analysis. The results can be summarized as follows: 1. The right ventricular wall in the present series was thicker than normal, particularly near the tricuspid valve annulus. 2. Pulmonary valve and pulmonary infundibulum perimeter were below normal. 3. Tricuspid valve perimeter was above normal. 4. Above normal figures were obtained for length and volume of the right ventricular inflow tract. 5. Increased outflow tract length contrasted with below normal figures for outflow tract volume. 6. In a large number of cases (95%) the distance between the crista supraventricularis and the pulmonary sigmoid leaflets was reduced. Characterization of these changes may help to elucidate the embryological origin of tetralogy of Fallot.

Cardiac Volume↗
PubMedDate not supplied

Atrioventricular septal defect: quantitative anatomy of the left ventricle.

A morphometric study was performed in 18 human hearts with atrioventricular septal defect not associated with other anomalies; 16 hearts had common atrioventricular orifices, and 2 presented separate right and left atrioventricular orifices. A total of eight parameters were analyzed, characterizing ventricular wall thickness, length and circumference of the inflow and outflow tracts, and circumference of the left orifice and aortic orifice. The data were compared with previously published patterns of normality. In addition, the volume of the aortic outflow tract was calculated. The inflow tract was shorter than the outflow tract, and the length of the diaphragmatic wall was equal to the sum of the lengths of the inflow tract and ventricular wall thickness at the level of the apex.

Cadaver↗
PubMedDate not supplied

Molecular coherent scattering data for tissue in photon transport Monte Carlo codes.

The suitability of introducing molecular interference effects into coherent scattering phenomenology is considered here in the case of X and gamma photon transport in biological tissues. In order to make its implementation practicable in most of the existing open user Monte Carlo codes, a self-consistent basic set of tabulations for the linear differential scattering coefficient was proposed. The tabulations were critically reviewed by testing their validity over the entire range of the momentum transfer variable from 0 to 10(10) nm(-1). Implementation in three different Monte Carlo codes was performed, and they proved to be reliable.

Adipose Tissue↗
PubMedDate not supplied

A treatment for carpal tunnel syndrome: evaluation of objective and subjective measures.

This study was designed to assess the efficacy of a proposed new and unique program relative to treatment and troubleshooting for diagnostic causes of carpal tunnel syndrome (CTS). Objective measures of anthropometry, strength, range of motion, muscle activity, and task performance, together with subjective ratings of pain were observed in a group of individuals diagnosed with CTS. These measures were compared to a control population showing no symptoms of CTS prior to undergoing treatment and following completion of the treatment program. Results indicate that individuals with CTS had significantly lower values on some strength, range of motion, and slower task performance than did the control group. Ratings of pain and distress were also significantly higher than the controls, and in the literature the CTS group's values approached levels of chronic pain. Analysis of posttreatment cases revealed statistically significant improvements in several strength measures of up to 25% over pretreatment values. Significant improvement was also shown in several range of motion measures of up to 22%. Finally, a significant reduction of 15% in pain and distress ratings was demonstrated in the posttreatment cases.

Adult↗
PubMedDate not supplied

A treatment for carpal tunnel syndrome: results of a follow-up study.

OBJECTIVE: This study was a follow-up evaluation of carpal tunnel syndrome (CTS) subjects based on objective and subjective measures utilizing a conservative treatment method. It was hypothesized that the CTS individuals would maintain their improvements over the course of a 6-mo period after treatments. DESIGN: The design used was a case control study in which the improvements of the CTS subjects were compared within themselves and with a matched comparison group. The treatments were performed at a private chiropractic clinic, and the objective and subjective measures were independently taken in an industrial engineering laboratory. All CTS subjects were volunteers from a random sample. Forty-three individuals were evaluated at the pretreatment period and in the 6-mo follow-up. Only 22 subjects returned for reevaluation. The treatment duration was not controlled. RESULTS: The results indicate that CTS subjects had maintained improvements in most of the objective measures and pain and distress ratings over the pretreatment level (p < .05) at 6 mo post-treatment. When compared to a matched comparison group, CTS-treated subjects demonstrated no significant differences (p < .05) in grip strength (for females), pinch strength, forearm pronation and supination forces, assembly task performance and pain and distress scores. CONCLUSION: The results of statistical analyses indicate that CTS subjects can be treated and achieve a significant recovery to within normal comparative levels of non-CTS subjects in most subjective and objective measures.

Adult↗