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Biomedical subjects

M A Ballal

Publications and source records attributed to M A Ballal.

6 recordsLinked to original sources
PubMed1987

Effects of exposure to cotton dust on energy expenditure in the textile industry.

An assessment of energy expenditure has been made in 50 male textile workers and 30 male office cleaners. There was a statistically significant difference (P less than 0.001) in energy expenditure between textile workers and office cleaners amounting to 12 to 16%. While 33.3% of the textile group complained of chest disorders, none of the cleaners had such a complaint. FEV1 and FVC values of the textile workers were significantly lower (P less than 0.01) compared to those of the controls. There were no differences in body weight, lean body mass and socio-economic conditions of the two groups, however, the textile workers were younger and taller than the unexposed group. Exposure to cotton dust and respiratory and ventilatory impairments are suspected of causing a reduction in the energy expenditure of the textile workers.

Adolescent↗
PubMed1982

An evaluation of the Oxylog as a portable device with which to measure oxygen consumption.

The Oxylog, a portable device for measuring oxygen consumption, was evaluated under standard, laboratory conditions and with exercising human subjects. The difference in oxygen partial pressure between room air and a series of test gases measured by the Oxylog showed good agreement with results obtained using a paramagnetic analyser and stable values were obtained for at least 6 h. The measurement of oxygen consumption by the Oxylog was assessed under simulated conditions, with an anaesthetic ventilator, and in exercising human subjects. With a simulated steady-state oxygen consumption there was an initial delay of 2 min before any oxygen consumption was recorded. Subsequent increases in simulated oxygen consumption were detected within one minute. The oxygen consumption of exercising human subjects measured with the Oxylog showed very good agreement with simultaneous measurements obtained using the Douglas bag technique. The application of an appropriate conversion factor allows the individual's energy expenditure to be estimated from the oxygen consumption: in this study a factor of 20.08 kJ per litre oxygen consumption gave the best agreement with the Douglas bag estimate.

Adult↗
PubMed1980

A portable physiological data recording/decoding system.

Counting the number of heart beats and footsteps during successive minute periods permits assessment of the physical condition of a subject undertaking planned exercise. We describe the design, and assess the use, of a small, 4 channel, solid state recorder for storing these physiological signals and the rapid retrieval of this data using a portable decoder. The actual number of heart beats and footsteps are counted and stored after each successive minute period. One channel is used to code sequentially the subjects under test, and a further channel is used for event marking. Data are retrieved by linking the recorder to the decoder; entering the required subject's code onto a numeric key board initiates the presentation of data. A LED display and paper print-out provide visual and permanent records.

Electrocardiography↗
PubMedDate not supplied

Growth velocity in children in rural Khartoum, Sudan.

The results of a mixed cross-sectional and longitudinal anthropometric survey of Sudanese children up to the age of sixteen years are reported. Weight velocity, height velocity, mid arm circumference velocity, and mid arm muscle circumference velocity, and the age at which 50% of females have reached menarche have been calculated. Growth velocities are lower than for English children and the puberty growth spurts occurs about one year later in Sudanese than in English children

Adolescent↗