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Biomedical subjects

G Catenacci

Publications and source records attributed to G Catenacci.

At least 37 records · Page 2Linked to original sources
PubMed1984

[Validity of a biophysical model for predicting heart rate values during activities operating under a risk of thermal stress].

After measuring the heart rate values of workers unfolding a standardized job made under unfavourable microclimatic conditions, the Authors calculate them by application of a proposed biophysical model starting from ambient climatic conditions, energetic expenditure and thermal resistance of the clothing. The results, compared by means of statistical methods, do not show any significant difference between the two methods. Therefore is also possible the proposal of the use of the biophysical model for the prevision of heart rate under standardized working conditions.

Heart Rate↗
PubMed1984

[Use of a biophysical model to verify various methods for limiting the time of work activity at risk in thermal stress].

The Authors measure the environmental microclimatic parameters (dry bulb temperature, wet bulb temperature, globe temperature, natural wet bulb, air speed, vapor pressure) in twenty working sites. Starting from the values obtained, they calculate the safe exposure times for works under unfavourable thermal conditions by means of three different methods (time weighted average WBGT, allowable exposure time-AET, required sweat rate index). Finally they verify the results obtained by application of a biophisical model proper to calculate the response of rectal temperature to changes in metabolic rate and environmental conditions.

Body Temperature↗
PubMed1984

[Control of duration limits of work activity at risk in thermal stress by prediction of values for internal body temperature].

A biophysical model for studying the response of the rectal temperature to changes in metabolic rate and environmental conditions has been utilized to establish the safe exposure times for works at risk of thermal stress. The prediction of the rectal temperature allows to evaluate for how long the heat load due to metabolic rate is lasting after the work stopping in the period of recovery.

Body Temperature↗
PubMed1984

[Decrease in environmental pollution and changes in biological indicators in occupational exposure to lead].

The Authors examine the variations of the levels of PbB and EPP in 39 workers at known lead exposure and evaluate the capacity of these parameters to follow the measured decreases of the environmental pollution. They conclude that the variations of the mean PbB values are well related to environmental pollution and that the diagram on the probability paper of median values and their corresponding standard deviations allows to calculate the number of exposed workers with biological values above a fixed limit.

Adult↗
PubMed1984

[Microclimatic indexes and limits of safe exposure in work activity at risk of thermal stress].

The working time in work places thermically uncomfortable must be limited in order to prevent the risk of thermal stress. In a previous study we have demonstrated that the best method for calculation of the safe exposure times is based on the required sweat rate index. In the present work we verified in different work places termically uncomfortable, grouped for equivalent values of WBGT index, the variability of the safe exposure times calculated by means of a method just now mentioned for various levels of energetic expenditure. The results point out the possibility of a mathematical relation between energetic expenditure, WBGT index and mean of safe exposure times.

Climate↗
PubMed1984

[Control of cardiac frequency in work activity at risk of thermal stress].

The working time in work places termically uncomfortable must be limited in order to prevent the risk of thermal stress; the safe exposure times are based on the microclimatic parameters and the energetic expenditure required for the job. Hearth rate measure is proposed by various Authors as index connected with the energetic expenditure level and with the microclimatic conditions. In the present work the Authors realise the monitoring of a job uncomfortable for thermal conditions by means of the hearth rate measure of the workers. The results show the better accuracy of the purposed method in comparison with the application of the safe exposure times.

Heart Rate↗
PubMed1984

[Thermal balance in workers of in greenhouses for the cultivation of tropical plants].

The Authors starting from the microclimatic parameters globe temperature (tg), dry bulb temperature (ts) forced wet bulb temperature (tu), natural wet bulb temperature (tun), speed of the air (v) observed every half an hour in greenhouses for tropical plants, evaluate the required sweating rate per hour during a specimen working shift for a known energetic expenditure. The sweating rate values calculated exceed by far the highest limits accepted for the workers perfectly acclimatized and impose the application of the working safe exposure times.

Agriculture↗
PubMed1983

[Duration limit of moderately heavy work activity in technically unfavorable environments].

The working time in work places thermically uncomfortable must be limited in order to prevent the risk of thermal stress. The Authors measure the environmental microclimatic parameters (dry bulb temperature, wet bulb temperature, globe temperature, natural wet bulb temperature, air speed, vapor pressure) in twenty working sites of a thermal power plant. Starting from the values obtained, they calculate the safe exposure times under unfavourable thermal conditions by means of four different methods (WBGT, time weighted average WBGT, allowable exposure time-AET, required sweat rate index). The results are critically analysed.

Environment, Controlled↗
PubMed1983

[Threshold of energy expenditure for maintenance of thermal comfort in working areas].

The Authors test the possibility of improving the microclimatic conditions of some working areas by assessing the threshold energetic expenditure (KCal/hour and KCal/min) in order to maintain the thermic well-being by means of a "thermic comfort" parameter, PMV. For this purpose, we measured PMV on the basis of tg, ts, V, tun, Pa and Clo in 15 working areas. Then, by an iterative mathematical process, we calculated the threshold value of energetic expenditure in accordance with the values of PMV which show conditions of thermic comfort, that is between + 0.5 and - 0.5. In all the working areas observed it is possible to perform works requiring energetic expenditures lower than 200 KCal/h in conditions of thermic comfort; in 50% of the situations we examined even works requiring higher energetic expenditures.

Body Temperature Regulation↗
PubMed1983

[Microclimate and duration of work tolerance in hothouse for cultivation of tropical plants].

The AA. starting from the environmental values carried out in a greenhouse for tropical plants investigate the possibility of prevent the risk of thermal stress at standardized energetic expenditures by means of the measurement of a few microclimatic parameters; they elaborate also a nomogram proper to calculate the safe exposure times for works under unfavourable thermal conditions.

Climate↗
PubMed1980

Immunological parameters in farmers with chronic lung disease.

The serum concentrations of IgG, IgA, IgE, C3 (B1A), C4 and alpha 1 AT were measured in 8 farmers with chronic pneumopathy, who showed precipitins against M. faeni or T. vulgaris in the serum. A group of 8 precipitins negative farmers who had worked in barn and 28 normal subjects served as control. IgG were elevated in the patients with detectable precipitins; levels of serum IgA in patients with precipitating antibody were lower than in the subjects without them. The mean levels of C3 were significantly lower in the farmers with detectable precipitins than in the farmers without precipitating antibody and in the control group.

Adult↗
PubMed1978

[Lead automated microdetermination in capillary samples of blood by a flameless atomic absorption spectroscopy (author's transl)].

A method for lead determination in capillary samples of blood based on flameless atomic absorption spectroscopy in connection with an automated microsampling system is described. For such determinations 50 microliter of heparinized whole blood samples from the fingertip or from the ear lobe are sufficient. Immediately after sampling blood is diluted in ratio 1:5 by an aqueous 0.05% Silicon Antifoam solution. Correlation between lead capillary from the same subjects and venous blood levels sampled from the same subjects and in the same sampling session is highly significant and well suited for routine clinical use.

Blood Specimen Collection↗
PubMed1976

[Functional conditions of the respiratory system and work site pollution. III. Relationships between "risk indicators" and "respiratory risk" in a chemical industry (author's transl)].

The results are reported of a retrospective study carried out by the authors on 717 workers of a chemical industry whose exposure was diversified and quantified through a work environment survey. A comparison between "risk indicators" and both objective (respiratory function changes) and subjective (chronic bronchopneumopathy symptoms) "risks" showed a significant probability of the causal role played by work environment pollution in respect of the repiratory changes found by the authors.

Air Pollutants↗
PubMed1975

[Functional conditions of the respiratory system and work site pollution. II. Prevalence of respiratory function changes in workers employed in bichromate and chromic acid production (author's transl)].

The authors report the prevalence of respiratory function changes in two groups of workers employed in bichromate and chromic acid production. In the first group (82 subjects) examined at the Institute of Occupational Medicine, the following tests were performed: filling out of a questionnaire for cronic bronchitis; chest x-ray; spirometry; pulmonary diffusing capacity (DLco) measurement; blood gas analysis on arteriolized capillary; He and CO2 rapid expiratory curves determination. No environmental pollution data were available. In the second group (180 subjects) examined at the working site, the following tests were performed: filling out of a questionnaire -or chronic bronchitis; spirometric determination. Environmental pollution data were available. A causal connection is hypothesized by the authors between either roentgenologic or respiratory functional changes and chromium exposure, and an increased proportion between lung function changes and exposure length is stressed.

Adult↗