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Biomedical subjects

C Edmonds

Publications and source records attributed to C Edmonds.

At least 37 records · Page 2Linked to original sources
PubMed1985

Hearing loss with frequent diving (deaf divers).

An audiometric survey was performed on a group of professional abalone divers, all of whom had experienced a great deal of exposure to dysbaric conditions. The results of this survey revealed that, even allowing for the very liberal requirements of the Australian standards for divers, over 60% had an unacceptable sensorineural, high frequency deafness. In half of these cases it was unilateral, and half bilateral. Making allowance for age, over 70% had evidence of hearing loss to a degree considered by the National Acoustic Laboratories to be compensatable.

Adult↗
PubMed1985

Intellectual deterioration with excessive diving (punch drunk divers).

A survey was performed on a specific occupational group of compressed air divers--the professional abalone divers of New South Wales. One aspect of this survey included the use of psychometric screening tests to elicit evidence of impaired intellectual capacity, which may be related to the compressed air diving. Results of the survey indicate that there is suggestion of intellectual impairment in almost half of this diving population. The fact that this diving group exposed themselves to much greater decompression stress than the more conventional professional diving groups suggests that these results should not be extrapolated to other diving populations. The results are supportive of the anecdotal beliefs that exist regarding this highly selective diving group, i.e., that a syndrome of reduced intellectual capacity (dementia or "punch drunkenness") may be present.

Adult↗
PubMed1981

Transfer effects in feature-positive and feature-negative learning by adult humans.

In two experiments, college students performed a feature-positive or a feature-negative discrimination task based on colors or symbols and were then transferred to a feature-positive or feature-negative discrimination based on the other stimulus dimension (symbols-colors, colors-symbols). Initial task results yielded a substantial feature-positive effect and indicated that the color task was easier than the symbol task. Transfer task results indicated that the feature-positive effect was maintained and showed that consistent transfer (positive-positive, negative-negative) led to superior performance on the transfer task. These results were obtained when the correct solution to the initial task was provided to the subject prior to transfer (Experiment 1) and when it was not (Experiment 2). These results systematically replicated the existence of the feature-positive effect in adult humans and showed that both feature-positive and feature-negative discrimination learning were facilitated by consistent examples of these problems.

Discrimination Learning↗
PubMed1980

Cardiovascular effects of hot water immersion (suicide soup).

Deaths from thermal stress have been reported in saunas, diving environments, and now hot spa baths. While investigating the physiological effects of hyperthermic immersion and its application to the therapy of hypothermia, some disturbing physiological anomalies were noted in normal subjects. The effects of standing, cold water immersion and of exercise, each following hyperthermic immersion, were examined. This was a pilot study only but it now seems possible that the ectopic beats may be an effect of the hyperthermic environment rather than the return of cold blood to the extremities, as previously assumed.

Adult↗
PubMed1976

Dangerous marine animals.

Tales of dangerous marine animals have flourished, entwining history, legend and imagination. Man is now demonstrating his remarkable adaptability in returning to the aquatic environment, from which he had his origins, and factual knowledge of marine creatures is surplanting mystery, folklore and fear. There is still cause to fear certain aspects of the underwater world, and the one aspect that still holds sway over public interest is that of dangerous marine animals. There is little justification for this top priority. The kelp beds of San Diego will claim more diving victims than all the marine animals around the United States of America. The cold seas off the English coastline, the tidal currents of Hawaii and the multitude of drowning accidents in water caves of Florida and Australia belittle the relatively few fatalities caused by marine animals. Nevertheless, the latter do cause injury and death, especially in the tropical, subtropical and temperate regions. The Indo-Pacific area seems particularly well endowed with a variety of potentially lethal species, and some of these will be dealt with in this paper.

Animals↗
PubMed1975

Disorientation with middle ear barotrauma of descent.

Disorientation and vertigo, which develops in divers during descent, is objectively demonstrated with dysbaric electronystagmographic tracings. Middle ear barotrauma of descent is verified as a valid etiology in the classification of vertigo associated with diving and may present as either a transitory or a more persistent disorder.

Diving↗