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Biomedical subjects

M Greer

Publications and source records attributed to M Greer.

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

Heart rate and blood pressure response to several methods of strength training.

This study was undertaken to determine heart rate and blood pressure responses to various exercises used during strengthening programs. Heart rate, blood pressure, and pressure-rate product (systolic blood pressure X heart rate) were determined for five subjects performing five different strength-training exercises at 75 and 100 percent of maximum voluntary contraction (MVC). The exercises included isometric and isokinetic exercises and isotonic exercises with free weights. Systolic blood pressure, diastolic blood pressure, and pressure-rate product increased significantly with all exercises; heart rate increased with most of the exercises. In some, but not all, of the exercise sessions in which two measurements were made at different times, heart rate, blood pressure, and pressure-rate product were higher for the second measurement. Pressure-rate product was significantly higher for the exercises performed at 100 percent of MVC than for those performed at 75 percent of MVC. The isokinetic exercise performed at 100 percent of MVC produced the highest pressure-rate product.

Adult↗
PubMed1984

Long-term effectiveness of the Adolescent Learning Center: a challenge to the concept of least restrictive environment.

The long-term effectiveness of the Adolescent Learning Center, a model classroom for emotionally disturbed adolescents, is described. The classroom is located in a restricted environment away from the public school campuses. In this follow-up study, the social adaptation and perceived adjustment of students who have mainstreamed back into regular classes for more than one year were assessed. Results on a behavioral checklist, student attitude questionnaire, and parents' questionnaire indicated that gains in emotional adjustment continued to accrue significantly upon the students' return to the public school setting. Since the therapeutic environment of the Adolescent Learning Center prompted personal and behavioral changes that transferred effectively to the regular school setting, for these adolescents the "most appropriate environment" for correcting school adjustment problems was one that is highly restrictive.

Adolescent↗
PubMed1982

Dementia: a major disease of aging.

Mental deterioration and behavioral changes are particularly distressing effects of brain disorders. Differential diagnosis of dementing conditions is important because some are treatable. The physician must separate primary psychologic disorders from the dementias, and use office tests for evaluating a patient's neuropsychologic function.

Aged↗
PubMed1980

Physiological responses to low-intensity cardiac rehabilitation exercises.

This study determined the oxygen consumption, heart rate, and blood pressure responses in healthy subjects to calisthenic exercises designed for convalescing patients with cardiac problems. Comparisons of the different exercises showed intersubject variability in oxygen consumption per unit of body weight and in cardiovascular responses. The exercises showing the greatest variability in oxygen consumption, however, were not always the exercises with the greatest variability in heart rate and blood pressure. Upper extremity exercises tended to evoke a greater demand on the cardiovascular system, especially if the isometric component was large. These data suggest the necessity of carefully monitoring cardiovascular response when using a variety of calisthenic exercises in the rehabilitation of patients such as those with cardiac limitations and should provide useful information for prescribing exercise.

Adult↗
PubMed1979

Measurement of visual resolution at high luminance levels in patients with possible demyelinating disease.

An interferometric acuity device (Takata) has been used to study visual resolution in individuals with possible demyelinating disease. The instrument employed provides a large field with a continuous range of grid or fringe frequencies and a relatively intense (10(5) mean photopic trolands) stimulus. After a brief period of time with eyes closed, resolution thresholds of patient are repeatedly determined during a five minute period. In all individuals suspected of having a demyelinating disease tested to date, a fall off in resolution capability has been found in time when using this intense stimulus display. This occurs whether eye signs have been present, are present or have not yet been observed. Normal observers do not exhibit comparable decrements. The fall off in resolution capability may or may not occur at lower stimulus levels, and is often not revealed when testing routine Snellen acuity. Outer and inner retinal pathology (division based on vascular support) do not cause a comparable fall off in resolution in time. The interferometric acuity test is a non-invasive, easily applied test.

Adult↗
PubMed1979

Current concepts in managing TIAs and stroke.

No permanent neurologic deficit results from a transient ischemic attack, but patients with these episodes are at risk of stroke. Successful treatment depends on identifying the source of the problem--the heart, blood, or vessel wall. However, anticoagulants and antiplatelet agglutinating agents will reduce only the incidence of TIA's, not the incidence of stroke. Prompt vigorous treatment of progressive stroke may avert completed stroke. Heparin is recommended, unless a specific etiologic factor, such as polycythemia or hypertension, is identified.

Angiography↗
PubMed1979

Emergency evaluation of head injuries in the elderly.

The first hour after head injury in the elderly is the most critical. Airway obstruction and impaired cardiovascular reflex mechanisms are the major initial problems. A patient with an extracerebral hematoma may need emergency trephination. You must look for the specific clinical indications or use a CAT scan to identify surgically accessible lesions.

Aged↗
PubMed1976

Reaction times in Parkinson disease.

Ten hypokinetic parkinsonian patients and ten age- and sex-matched controls were tested, using reaction times with and without a warning signal. The time difference between each was used as a measure of phasic arousal. Both groups' reaction times improved with a warning signal, but there were no differences in reaction-time reduction between the parkinsonian and control groups. These results suggest either that hypokinesia in parkinsonism is not caused by an arousal defect or it is caused by a defect in the "autoevoked" arousal system.

Arousal↗
PubMed1976

The effect of acidosis in hypokalemic periodic paralysis.

Metabolic acidosis was produced in two patients with hypokalemic periodic paralysis by the administration of ammonium chloride over a period of three days. The challenging test of glucose and insulin produced a substantially smaller reduction of both serum potassium concentration and muscle strength than when the patients were tested in normal acid-base balance. The findings agree with earlier work on acetazolamide, suggesting that metabolic acidosis provides protection against episodes of muscle weakness in periodic paralysis.

Acetazolamide↗