Biomedical subjects

M J Stones

Publications and source records attributed to M J Stones.

At least 19 recordsLinked to original sources

PubMed2001

Traffic-related fatalities among older drivers and passengers: past and future trends.

PURPOSE OF THE STUDY: This study was initiated to forecast the number of older drivers and passengers who may be fatally injured in traffic crashes in future years. DESIGN AND METHODS: The study was based on data from the U.S. Fatality Analysis Reporting System covering the period from 1975 to 1998. Projections were based on least squares regression models. RESULTS: About 35,000 drivers and passengers died in traffic crashes each year from 1975 to 1998. Older adults (65 and older) accounted for 10% of all fatalities in 1975, 17% in 1998, and a projected 27% by 2015, the same proportion predicted for drivers and passengers aged younger than 30. On the basis of these projections, the number of fatally injured women and men aged 65 and older will increase respectively by 373% and 271% between 1975 and 2015. IMPLICATIONS: If current trends continue, the number of fatalities among older drivers and passengers and those aged younger than 30, may be equivalent early in this century. These projections call for further research into conditions that may lead to crashes involving older drivers and for the development and implementation of initiatives to curb traffic-related fatalities among older adults.

Accidents, Traffic↗

PubMed2000

Development of delirium: a prospective cohort study in a community hospital.

BACKGROUND: Previous research on risk of delirium in acute hospital settings identified mainly patient variables (e.g., age) that are not amenable to intervention. The purpose of this study was to develop a model for new delirium in hospitalized older patients that included process of care and social variables. METHODS: A prospective cohort study was undertaken in a community hospital in Ontario, Canada. Research participants included 156 hospitalized patients age 65+ years and without delirium on admission who were admitted to a medical or surgical unit. The measures included daily appraisal of delirium using a standardized and validated tool, and assessment of patient, process of care, and social variables. RESULTS: Delirium developed in 28 of the 156 patients (17.9%). Older age and cognitive impairment were significant patient variables. Significant process of care variables included a high number of medications administered during hospitalization, surgery, a high number of procedures during early hospitalization (e.g., x-rays, blood tests), and intensive care treatment. CONCLUSIONS: Approximately one older patient in five developed delirium after admission to a medical or surgical unit. Risks not easily amenable to intervention included age, cognitive dysfunction, surgery, and intensive care requirements. Risk factors that are potentially modifiable included number of medications and number of procedures. Future research might focus on the efficacy of such intervention to reduce new-onset delirium in acute hospital settings.

Aged↗

PubMed2000

Burden in caregivers of cognitively impaired older adults living in the community: methodological issues and determinants.

Considerable burden is reported by informal caregivers of older individuals with cognitive impairment. Significant progress in the understanding of determinants of this burden has been achieved. However, further progress could be attained if we considered important methodological issues that may have limited our understanding of caregiver burden. These issues include subgroups of care recipients and caregivers, measurement issues, research design, and statistical techniques. Fifty-three studies published between 1980 and 1997 (inclusive) that focused on caregiver burden were abstracted to determine the extent to which the methodological issues discussed above were considered. Overall, we found considerable variability among the studies surveyed. Further understanding of the caregiving process and reductions in caregiver burden will depend on the attention to methodological issues and understanding of burden across the whole caregiving career.

Aged↗

PubMed2000

Predicting caregiver burden and depression in Alzheimer's disease.

OBJECTIVES: The purpose of this study was to investigate the predictors of caregiver burden and depression, including objective stressors and mediation forces influencing caregiving outcomes. METHODS: This investigation is based on the 1994 Canadian Study of Health and Aging (CSHA) database. Participants were 613 individuals with dementia, living in either the community or an institution, and their informal caregivers. Participants for the CSHA were identified by screening a large random sample of elderly persons across Canada. Structural equation models representing four alternative pathways from caregiving stressors (e.g., functional limitations, disturbing behaviors, patient residence, assistance given to caregiver) to caregiver burden and depression were compared. RESULTS: The data provided the best fit to a model whereby the effects on the caregiver's well-being are mediated by appraisals of burden. A higher frequency of disturbing behavior, caring for a community-dwelling patient, and low informal support were related to higher burden, which in turn led to more depressive symptomatology. Caregivers of patients exhibiting more disturbing behaviors and functional limitations received less help from family and friends, whereas those whose care recipients resided in an institution received more informal support. DISCUSSION: Our findings add to the preexisting literature because we tested alternative models of caregiver burden using an unusually large sample size of participants and after overcoming methodological limitations of past research. Results highlight the importance of the effective management of disturbing behaviors, the provision of formal services for caregivers with highly impaired patients and no informal support, and the improvement of coping skills in burdened caregivers.

Activities of Daily Living↗

PubMed1999

Integrated health information systems based on the RAI/MDS series of instruments.

There is a growing need for an integrated health information system to be used in community, institutional and hospital based settings. For example, changes in the structure, process and venues of service delivery mean that individuals with similar needs may be cared for in a variety of different settings. Moreover, as people make transitions from one sector of the healthcare system to another, there is a need for comparable information to ensure continuity of care and reduced assessment burden. The RAI/MDS series of assessment instruments comprise an integrated health information system because they have consistent terminology, common core items, and a common conceptual basis in a clinical approach that emphasizes the identification of functional problems.

Canada↗

PubMed1997

1997 IPA/Bayer Research Awards in Psychogeriatrics. Associations between dysfunctional behaviors, gender, and burden in spousal caregivers of cognitively impaired older adults.

Reductions in healthcare spending and current demographic trends will result in increasing demands to care for aging relatives, especially those with cognitive impairment (e.g., Alzheimer's disease). Taking care of older individuals with cognitive impairment can be very challenging and burdensome. Caregiver burden is associated with negative outcomes such as caregiver depression and increased likelihood of patient institutionalization. One hundred eleven patients and their spousal caregivers were studied using a pre-post design. All subjects received a comprehensive medical intervention that included medical management of patients' problems and education of caregivers. We examined changes in patients' function and caregiver burden. At follow-up, patients' cognition and independence in activities of daily living had continued to deteriorate whereas their mood was improved. Regression analyses showed that changes in caregiver burden were positively associated with changes in the frequency of dysfunctional behaviors but not with changes in cognition. Gender was also related to changes in caregiver burden; male caregivers were more likely than female caregivers to report reductions in burden at follow-up. These data suggest medical interventions may provide some relief to caregivers of cognitively impaired older patients, but more research is required to identify the causal agents of this effect.

Activities of Daily Living↗

PubMed1993

Smoke without fire: a reply to Hardy, Segatore and Edge.

Literacy is defined in the Oxford English Dictionary as the ability to read and write, and illiteracy as an inability to read. Hardy, Segatore and Edge (1993) suggest a serious problem of illiteracy among student nurses that endangers patient safety. Their evidence is entirely anecdotal, some of which is misclassified as literacy errors. They provide no substantive or statistical evidence to support their claims. Educators making serious and provocative charges on such flimsy grounds ought either to recant or obtain evidence that is more convincing.

Education, Nursing↗

PubMed1993

Acute exercise facilitates semantically cued memory in nursing home residents.

OBJECTIVE: To study the acute effects of non-strenuous physical exercise on memory retrieval and visuo-motor performance in old-old nursing home residents. DESIGN: A randomized control trial. SETTING: A nursing home. PARTICIPANTS: Ambulatory volunteers from the nursing home, with all 20 shown to be normal on mental status. Three were male and 17 female, with a means of 84.5 years for age and 9.3 years for education. They were divided at random into an exercise and a control group. INTERVENTION: A single 15-minute standardized bout of non-strenuous exercise administered independently to each participant in the exercise group. Control group participants watched a video of similar exercises for 15 minutes. MEASUREMENTS: Two measures requiring the retrieval of category instances with semantic or initial consonant cues. Retrieval time was 60 seconds for each of four categories per measure. Visuo-motor performance was measured by Symbol Digit coding. Testing sessions were held before exercise, immediately post-exercise and 30 minutes post-exercise. RESULTS: The group-by-time interaction was significant only for semantically cued memory (P < 0.01), with higher retrieval at post-testing only in the exercised group. The higher retrieval was mainly attributable to more new items retrieved by the exercise group at the immediate post-test (P < 0.05). CONCLUSIONS: This study provides preliminary support for the hypothesis that non-strenuous physical exercise has positive acute effects on meaningfully cued memory.

Aged↗

PubMed1991

Age, activity, and physical performance: an evaluation of performance models.

Two performance models relating age, physical activity, and physical performance were evaluated on 5 age cohorts involving more than 6,000 persons ranging in age from 20 to 69 years. Significant age and activity main effects, without 1 Age X Activity interaction, were obtained on 5 fitness measures and 2 activity indexes. These results are inconsistent with predictions from the moderation model, but they fit predictions from a recently formulated tonic and overpractice model of physical performance.

Activities of Daily Living↗

PubMed1989

Age, exercise, and coding performance.

We investigated the effects of exercise on the coding performance of young and older subjects. Hypotheses were tested that exercise either facilitates spatial localization or reduces susceptibility to distraction in older subjects. In a balanced design, we administered Digit Symbol and Symbol Digit coding tasks to exercisers and nonexercisers at two age levels under conditions of low or high within-task interference. The findings showed higher performance by the exercisers than by the nonexercisers only at the older age level and only with the Symbol Digit task. These findings support the hypothesis that exercise compensates for a loss of spatial localization skills with age. We found no evidence that susceptibility to distraction either increased with age or was affected by chronic exercise.

Adult↗

PubMed1989

Multidimensional assessment of the elderly via a microcomputer: the SENOTS program and battery.

We compared the psychometric adequacy of a multidimensional self-report battery for use with cognitively able, elderly adults under conditions of microcomputer and interviewer administration. The SENOTS battery contains scales of Happiness/Depression, Financial Hardship, Physical Symptoms, Activity Limitation, and Activity Propensity. The SENOTS microcomputer program contains sequential phases intended to (a) select out respondents incapable of interacting adequately with the microcomputer, (b) train respondents to make appropriate keyboard responses. (c) administer the program, and (d) store and process the responses. The SENOTS battery was administered to 80 community residents and 80 institution residents by either a microcomputer or an interviewer. Results indicated a comparable psychometric adequacy to the SENOTS battery under both administration conditions. Internal consistencies were all at acceptable levels, and the scales differentiated the community residents from the institution residents.

Activities of Daily Living↗

PubMed1989

The prediction of mortality in elderly institution residents.

The relationship between activity and mortality has been examined mainly in middle-aged and elderly community residents. This study investigated the prediction of five-year mortality in 156 institution residents, including a subsample (n = 121) retested one year after the initial assessment. The measures included demographic variables, three health indexes, happiness, quality of life ratings, personality and life stress indexes, cognitive function, and activity level. The strongest predictors of survival beyond five years from initial testing were a younger age and a high activity level. The relationships of age and activity to survival were mutually independent and were not secondary to the effects of any other variable. Health was not related to activity level and did not emerge as a strong predictor of survival. After a consideration of methodological issues, the findings were interpreted as providing support for an activity theory formulation of mortality prediction.

Activities of Daily Living↗

PubMed1989

A controlled evaluation of reminiscence and current topics discussion groups in a nursing home context.

In this randomized study, we compared the psychological well-being of elderly nursing home residents who participated in reminiscence and current topics group discussions with a control group of residents. We rated participants happiness/depression, activity, mood, and functional levels before and after the group interventions. The intervention had a significant effect only on the happiness/depression measure, with both intervention groups showing positive changes compared to the control group.

Affect↗

PubMed1987

Social desirability in measures of subjective well-being: a systematic evaluation.

The present investigation addressed the problem of a social desirability response bias in measures of psychological well-being. Data on 150 people, between the ages of 50 and 82, yielded high correlations between three measures of well-being (the MUNSH, the LSI-Z, and the PGC) and the Edwards Social Desirability Scale, but only moderate ones between well-being scales and the Marlowe-Crowne Social Desirability Scale. Part correlations between well-being measures and an external criterion of happiness, controlling for social desirability, failed to improve on the zero-order criterion/well-being relationship. Controlling for social desirability, therefore, does not enhance the construct validity of well-being scales. These and related results suggest that the high zero-order correlations between measures of well-being and the Edwards scale are more readily attributed to content similarity between the Edwards scale and measures of well-being than to a social desirability response bias in well-being measures.

Aged↗

PubMed1987

Balance and age in the sighted and blind.

This study evaluated the usefulness of a balance test with eyes open and closed to index postural control capability. Experiment 1 was a one-year longitudinal study of 225 subjects aged 50 to 82 years. Comparing the two conditions, balance with eyes open had higher reliability, had greater sensitivity to aging effects, correlated stronger with functional age indices (vital capacity and forced expiratory volume), and showed greater sensitivity to the effects of physical fitness training. Experiment 2 included 22 visually impaired subjects aged 19 to 84 years. Minimally sighted subjects balanced for longer than fully blind subjects, but no differences in balance were found between subjects blind from birth versus those with acquired vision loss. The findings demonstrate the importance of vision to balance and indicate that balance with eyes open is a valid and sensitive test for clinical and research purposes.

Aged↗

PubMed1986

Age by distance effects in running and swimming records: a note on methodology.

Running and swimming records by Masters athletes provide useful data for appraising age trends in physical performance; however, different forms of analysis have yielded conflicting conclusions about whether the deterioration with age is greater on sprint events or longer events. Aspects of analytic procedure that have contributed to the conflict include the use of time or velocity as the dependent variable, and the expression of age trend as relative or absolute change. An evaluation of underlying issues showed that meaningful inferences can be derived either where relative age change is compared across events, or the dependent variable is transformed to a logarithmic scale for purposes of comparing absolute change across events. Confounding of variables is introduced if absolute change in velocity is analyzed with respect to both age and event. The conclusion from every analysis in the literature that permits meaningful inference is that deterioration with age is greater on events of beyond sprint distance.

Aging↗

PubMed1986

Age trends in maximal physical performance: comparison and evaluation of models.

Versions of five paradigmatic models of age change in maximal physical performance were compared with respect to internal and validational data. The models were termed power output, power supply, energy output-supply, motivation, and sampling. The power output models tended to be more stringent in terms of internal criteria. The model that best predicted the validational data (i.e., from studies of reaction time, strength assessment, and athletic records) was from the energy output-supply category. This model, the power output relative to power available (POrPA) model, postulates that deterioration with age in physical performance varies with the ratio of peak power output to available power: the numerator generally varies with the strength demands of the task, and the denominator varies with task duration at high power output. The implications of this model were discussed with respect to habitual physical performances in later life.

Adult↗

PubMed1986

"Happy are they who are happy . . ." a test between two causal models of relationships between happiness and its correlates.

The intention of the study was to test between two causal models of relationships between happiness and five of its correlates (i.e., housing satisfaction, financial satisfaction, perceived health, locus of control, and activity level). In Model 1, happiness was identified as a propensity variable that is a source of influence on the lower order correlates. Model 2 is a traditional formulation whereby levels of happiness are determined by its correlates. The models were tested by causal modeling procedures, using 18-month longitudinal data from 408 elderly subjects. The findings support Model 1 over Model 2 for 17/18 predictions that differentiated the models. The status of happiness as a trait was discussed with reference to: the type of items included in the happiness scale; and relationships with variables not included in the research.

Aged↗