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Biomedical subjects

R A Fox

Publications and source records attributed to R A Fox.

At least 73 records · Page 4Linked to original sources

Mothers and fathers of young children: comparison of parenting styles.

This study compared the developmental expectations and parenting behaviors of 52 mothers and fathers with children between the ages of 1 and 4 years, using the Parenting Inventory: Young Children. While both mothers and fathers were nurturing parents, mothers obtained significantly higher nurturing scores. Possible reasons for this difference were discussed. Developmental expectations and discipline strategies did not differ between mothers and fathers.

Child, Preschool↗

Effect of speech distinctions and age differences on auditory event-related potentials.

P3 event-related potentials were recorded from 37 subjects in two age groups (19-25 and 61-75 years) listening to tones, stop + vowel (CV) monosyllables, and isolated vowels. P3 latencies were found to be significantly longer for older subjects in all stimulus conditions. CV latencies were also significantly longer than simple tone latencies with the increase being approximately 1.30 msec/year. Latencies to the vowel stimuli were somewhat more variable but also tended to be greater than the tone latencies. P3 amplitudes were greater for the tone stimuli than for the speech stimuli, but no significant age effects were found.

Acoustic Stimulation↗

The kinematics of idiopathic gait disorder. A comparison with healthy young and elderly females.

In this study the kinematic gait parameters of healthy young and elderly subjects were compared with those of a group of patients with idiopathic gait disorder of the elderly (IGDE), a condition characterized by dysfunctional walking for which no underlying cause can be determined. The velocity and the temporal/distance gait kinematics were measured for self-selected fast, medium and slow speeds of walking. The elderly walk with a more cautious gait pattern than younger adults. This pattern is characterized by a slow walking speed and a reduced single support phase, with shorter but more frequent strides, and is even more marked in persons with IGDE. The slower the walking speed the more cautious this pattern becomes. The patients with IGDE not only walk far slower than a group of healthy age matched individuals but the range of speeds, from self-selected slow to fast, is much reduced and does not overlap that of the healthy elderly. With objective gait measurements this group might be better identified.

Adult↗

A prospective controlled trial of a geriatric consultation team in an acute-care hospital.

Attempts to prove the usefulness of geriatric consultation teams (GCT) in acute-care settings have been inconclusive. We have completed a prospective, controlled trial of a GCT in an acute-care setting, aiming our interventions at a specific subgroup of elderly patients. One hundred and thirty-two out of 352 (37.5%) patients met the inclusion criteria with 66 each being assigned to the intervention and the control groups. There were no significant differences in baseline characteristics between the two groups. Patients in the intervention group received follow-up after discharge from hospital by the geriatric service. We found that the intervention was associated with improved 6-month survival (p less than 0.01), improved Barthel Index at 1 year (p less than 0.01), and a trend towards decreased reliance on institutional care (hospital or nursing home) during the year of follow-up. The benefits occurred principally in patients who were discharged to a nursing home. Our findings support the utility of GCT and highlight the importance of focusing the intervention and providing follow-up after discharge from hospital.

Aged↗

Conditioned taste aversion and motion sickness in cats and squirrel monkeys.

The relationship between vomiting and conditioned taste aversion was studied in intact cats and squirrel monkeys and in cats and squirrel monkeys in which the area postrema was ablated by thermal cautery. In cats conditioned 7-12 months after ablation of the area postrema, three successive treatments with xylazine failed to produce either vomiting or conditioned taste aversion to a novel fluid. Intact cats, however, vomited and formed a conditioned aversion. In squirrel monkeys conditioned 6 months after ablation of the area postrema, three treatments with lithium chloride failed to produce conditioned taste aversion. Intact monkeys did condition with these treatments. Neither intact nor ablated monkeys vomited or evidenced other signs of illness when injected with lithium chloride. When the same ablated cats and monkeys were exposed to a form of motion that produced vomiting prior to surgery, conditioned taste aversion was produced and some animals vomited. These findings confirm other studies indicating motion can produce vomiting in animals with the area postrema destroyed and demonstrate that motion-induced conditioned taste aversion can be produced after ablation of the area postrema. The utility of conditioned taste aversion as a measure of subemetic motion sickness is discussed by examining agreement and disagreement between identifications of motion sickness by conditioned taste aversion and vomiting. It is suggested that a convincing demonstration of the utility of conditioned taste aversion as a measure of nausea requires the identification of physiological correlates of nausea, and caution should be exercised when attempting to interpret conditioned taste aversion as a measure of nausea.

Animals↗

The susceptibility of rhesus monkeys to motion sickness.

The susceptibility of rhesus monkeys to motion sickness was investigated using test conditions that are provocative for eliciting motion sickness in squirrel monkeys. Ten male rhesus monkeys and ten male Bolivian squirrel monkeys were rotated in the vertical axis at 150 degrees/s for a maximum duration of 45 min. Each animal was tested in two conditions, continuous rotation and intermittent rotation. None of the rhesus monkeys vomited during the motion tests but all of the squirrel monkeys did. Differences were observed between the species in the amount of activity that occurred during motion tests, with the squirrel monkeys being significantly more active than the rhesus monkeys. These results, while substantiating anecdotal reports of the resistance of rhesus monkeys to motion sickness, should be interpreted with caution because of the documented differences that exist between various species with regard to stimuli that are provocative for eliciting motion sickness.

Animals↗

A worksite parenting program.

With more and more companies offering wellness programs for their employees, it seems reasonable to offer parent training classes to employees as an educational tool and a means of coping with stress. A series of parenting classes was developed using the STAR Parenting Model. The STAR Model teaches parents to stop, think, ask, and respond to their children based on tenets of cognitive behavior management. Classes taught to faculty and staff of the university were well attended and participants indicated that the method positively altered their parenting practices. Parents are challenged by their young children and by their jobs and careers. Parenting education at work may help to ease some employee stress and improve their parenting practices.

Adaptation, Psychological↗

Low-income pregnant adolescents and their infants: dietary findings and health outcomes.

Dietary and other health-related data were obtained for 99 low-income, pregnant adolescents aged 13 to 19 years and their infants who were enrolled in the Teen Pregnancy Service (TPS). The dietetic services provided through TPS are highlighted for this sample of teens, 97% of whom were eligible for the WIC program. Average gestational age at time of enrollment for prenatal care was 18 weeks; 59% of the sample was anemic (hemoglobin value less than 120 gm/L). The average number of servings teens consumed each day from the four food groups was as follows: bread/grain, 5.0; milk, 2.8; meat, 2.8; and fruit/vegetable, 2.3. Teens who were overweight before pregnancy had heavier infants (mean = 3,344 gm) than their underweight peers (mean = 2,770 gm). Teens who gained 24 lb or less during pregnancy and who gave birth to full-term infants had infants with significantly lower birth weights (mean = 3,094 gm, p less than .008) than those who gained at least 25 lb (mean = 3,356 gm). Teens who smoked also had infants with lower birth weights than teens who did not smoke. Most teens bottle-fed their infants (82%). On the basis of our data, we conclude that low-income pregnant teens are likely to be at dietary risk. Dietary work with low-income pregnant adolescents is challenging and requires a thorough knowledge base about adolescent pregnancy, coupled with the ability to adapt traditional dietary counseling practices to meet the unique needs of these clients.

Adolescent↗

Perinatal follow through: implications for primary physicians.

Neonatal intensive care unit follow-through programs provide early evaluation information for the primary care physician. This article describes such data for 339 graduates of St Joseph's Special Care Nursery, 78% of whom were preterm and 70% were of low birth weight. At six months, 7% of the infants were diagnosed with cerebral palsy, based on a 15-month follow-up. Other neurological and respiratory problems were common. A normal neurodevelopmental outcome was found for the majority of the infants. Referrals to medical specialists (eg, ophthalmology) and early intervention programs were required for many infants. The case management role of the primary physician is highlighted along with specific recommendations for care of the medically at-risk or developmentally delayed infant.

Family Practice↗

Competencies required for the practice of geriatric medicine as a consultant physician.

Geriatric medicine in Canada is now being viewed not merely as an academic specialty but, rather, more broadly as a service specialty providing consulting support to other physicians. Any redesigning of training programs will have to be done with this fact in mind. We drew up a list of competencies required for consultant practice in the field and presented them to other practitioners of geriatric medicine and members of the Canadian Society of Geriatric Medicine for feedback. We believe that the resulting list of competencies can be used as a starting point for redesigning training programs in geriatric medicine.

Attitude of Health Personnel↗

Presentation level determination for CV tokens using a computer-controlled adaptive procedure.

The feasibility of using a computer-controlled adaptive procedure to find maximum monotic performance for consonant-vowel (CV) stimuli was evaluated and compared to the procedure typically used to determine a performance-intensity function in two experiments. In experiment I, the computer-controlled adaptive procedure and the typical manual procedure were evaluated on 26 normally hearing listeners. Results indicated that the shape of the performance-intensity functions was similar for both procedures with the computer-controlled adaptive procedure selecting a higher presentation level. The test-retest reliability for the computer-controlled adaptive procedure was good with a mean difference on retest of 1.2 dB. In experiment II, the same procedures were evaluated using 9 sensorineural hearing impaired subjects. Again similar configuration between functions was observed. The primary advantage of the computer-controlled adaptive procedure for both subject groups is efficiency in terms of time of administration and number of CV stimuli used.

Adolescent↗

Breast-feeding attitudes and practices among adolescents.

Breast-feeding attitudes of 128 low-income, pregnant adolescents were assessed using a questionnaire developed for this population. Teens who had been breast-fed as infants had more positive attitudes than bottle-fed teens (p less than 0.002); no differences in attitudes were found by race or age. Pregnant teens who planned to breast-feed their infants had higher attitude scores than those who planned to bottle feed or who were uncertain (p less than 0.001). Of the sample, 32.4% subsequently breast-fed their baby; these teen mothers had more positive attitude scores than the teen mothers who bottle fed (p less than 0.001). The prenatal infant feeding plans of these pregnant teens were significantly related to their postnatal feeding practices (p less than 0.001). Selected implications of these data for health care professionals are discussed.

Adolescent↗

Prevalence of psychopathology among mentally retarded adults.

The prevalence of psychopathological disorders was determined in a random, stratified sample of 165 adults, 110 males and 55 females, with mental retardation using the Psychopathology Instrument for Mentally Retarded Adults. Stratified variables included mental retardation level and living environment (institutional, family, independent). Results showed that 35.9% of the sample had at least one significant psychopathological disorder. Presence of pathology was related to level of retardation, but not to living environment, sex, or age. Difficulties associated with assessing pathology in persons with mental retardation are described.

Adult↗

Importance of the redox state in vasoconstriction induced by adrenaline and serotonin.

The actin myosin system and the redox state have been implicated in a number of cellular functions and in many pathological conditions. To study the predictions of a new redox theory of actin-myosin interaction we examined the relationship between the redox state and vasoconstriction of rat aorta and dog basilar artery by adrenaline and serotonin. The results show that the contraction induced by these physiological agents can be inhibited and reversed by reducing agents.

Actomyosin↗

Dynamic information in the identification and discrimination of vowels.

The dynamic theory of vowel perception emphasizes the importance of the consonant transitions in CVC syllables to the identification of the vowel itself. However, the dynamic theory is relatively vague in terms of what perceptual processes may be involved and it says nothing about the role of auditory and/or phonetic memory for such 'dynamic events'. The present study created three synthetic [iota]-[epsilon] continua consisting of a [bVb] full-syllable continuum, a silent-center continuum (which had over 72% of the medial vowel replaced by silence) and an isolated vowel continuum to specifically examine (1) the use of auditory and phonetic memory for dynamic acoustic cues and (2) the ability of listeners to track the trajectories of very brief formant transitions. Experiment 1 demonstrated that there were no significant differences among the three continua in terms of listener identifications but that the silent-center tokens demonstrated significantly lower within-category discriminations, perhaps because of degraded auditory representation. Experiment 2 required listeners to make cross-continuum vowel discriminations and showed that some degree of acoustic similarity was important--listeners were particularly poor at discriminating between the silent-center and vowel-only tokens. This suggests that listeners were not able to make discriminations on the basis of abstract vowel labels alone. Experiment 3 demonstrated that listeners could make quite accurate vowel identifications even when as little as 1 pitch period of acoustic energy signaled the consonant transitions in the silent-center tokens. Experiment 4 showed that listeners' identifications of the silent-center stimuli were based on the formant changes in the transitions rather than their endpoint frequencies.

Cues↗