Anita M. Myers

Methodological Considerations for Researchers and Practitioners Using Pedometers to Measure Physical (Ambulatory) Activity

Abstract Researchers and practitioners require guidelines for using electronic pedometers to objectively quantify physical activity (specifically ambulatory activity) for research and surveillance as well as clinical and program applications. Methodological considerations include choice of metric and length of monitoring frame as well as different data recording and collection procedures. A systematic review of 32 empirical studies suggests we can expect 12,000–16,000 steps/day for 8–10-year-old children (lower for girls than boys); 7,000–13,000 steps/day for relatively healthy, younger adults (lower for women than men); 6,000–8,500 steps/day for healthy older adults; and 3,500–5,500 steps/day for individuals living with disabilities and chronic illnesses. These preliminary recommendations should be modified and refined, as evidence and experience using pedometers accumulates.

Challenges and Opportunities for Measuring Physical Activity in Sedentary Adults

AbstractIncreasing the physical activity of typically sedentary adult populations is at the forefront of the public health agenda. This review addresses the challenges in defining and measuring physical activity in this target group, for a number of purposes, namely, scientific or academic inquiry, surveillance, clinical application and programme evaluation. First, we clarify the conceptual distinctions between the terms sedentarism, physical inactivity, physical activity and energy expenditure. Next, we review and compare the utility of different approaches for quantifying and expressing physical activity in these populations. Physical activity in typically sedentary populations is most likely a simple pattern of behaviour that has been largely obscured by existing measures and its expression as energy expenditure. Existing self-report methods are practical, but suffer from floor effects and recall bias. Walking, the most important activity to assess in this target group, is very difficult to measure through self-report methods. Motion sensors are more appropriate for quantifying physical activity behaviours in typically sedentary populations. Of the 2 types of motion sensors — the accelerometer and the pedometers — the latter is more appealing because it is both an affordable and a ‘good enough’ measure of physical activity, specifically ambulatory activity. Although a common measurement approach would greatly facilitate our understanding of physical activity behaviour patterns, the selection of an approach ultimately depends on the purpose of the study and to a great extent, its budget. Researchers, clinicians and practitioners interested in accurately capturing the lower end of the continuum of physical activity (that is characteristic of sedentary populations) must thoughtfully consider the relative advantages and disadvantages of the available approaches.

Correspondence between self-reported and objective measures of driving exposure and patterns in older drivers

The driving behavior of older adults has been traditionally examined using questionnaires and diaries. The accuracy of self-reports has been questioned, and in-vehicle recording devices touted as more objective measures of real-world driving. The purposes of this study were to replicate and extend prior research comparing self-report and actual measures of driving exposure and patterns. Two electronic devices were installed in the vehicles of 61 drivers (67-92 years, 59% women) who were instructed to drive as usual over 1-week. Participants completed trip logs, daily diaries, a questionnaire on usual driving habits, ratings of situational driving frequency and avoidance and a follow-up interview. Only 53% of the sample attempted to estimate how far they had driven over the week and self-estimates were inaccurate (ME=77.5 km; CV=44.5%). Drivers tended to miss a significant number of trips and stops in their diaries. Driving behavior over the week was fairly consistent with usual practices regarding time of day, driving in certain areas, and night driving. However, subjects drove in challenging situations more than usual. Triangulating multiple sources of electronic and self-reported data provided a better understanding about the behavior of older drivers.

Pedometer-determined ambulatory activity in individuals with type 2 diabetes

This cross-sectional study presents the first normative data on pedometer-determined ambulatory activity, defined as steps/day, in 160 (98 males, 62 females; age=52.4 +/- 5.3 years; BMI=32.3 +/- 5.7) free-living individuals with type 2 diabetes. Participants took 6662 +/- 3077 steps per day, less than that reported in nondiabetic samples and more than that reported for samples living with more restrictive chronic conditions including claudication, joint replacement, chronic obstructive lung disease, and chronic heart failure. Steps/day and BMI were inversely and significantly correlated (r=-0.27, P<0.01). Further, there was a significant difference between BMI categories (from normal weight to obesity class III) with regard to steps/day (F=2.96, P<0.05). The difference was most apparent between the highest obesity classes (II and III) and normal weight categories. This data is useful for sample comparison purposes. In addition the standard deviation or variance estimates can be used to calculate samples sizes for intervention efforts. Objective quantification of ambulatory activity via simple and inexpensive pedometers permits researchers and practitioners to easily screen for level of activity along a continuum. This study opens the door for future research and clinical applications including identifying threshold values related to important health outcomes and evaluating incremental change due to various interventions in this population.

Examination of driving comfort and self-regulatory practices in older adults using in-vehicle devices to assess natural driving patterns

Several studies have shown that age, gender, visual problems and confidence are associated with self-regulatory practices such as reduced exposure and avoidance of night and highway driving. To date, however, self-regulation has only been examined through self-report. The purpose of this study was to further our understanding of the association between driver characteristics, perceptions and self-regulation by monitoring the patterns of 61 drivers (mean age 80.4+/-5.5; 59% women) for one week using in-vehicle devices. Usual self-regulatory practices were assessed using the Situational Driving Frequency (SDF) and Avoidance (SDA) Scales, while perceptions were measured using the Driving Comfort and Perceived Driving Abilities Scales. Additional evidence for test-retest reliability was obtained with a separate sample of 39 older drivers. Lower comfort and poorer perceived abilities were significantly related to actual behavior: reduced exposure (km, duration) in general and at night, average and maximum radii from home and driving in challenging situations (such as on highways). Neither sex nor age was associated with any of the driving indicators. While longitudinal studies are required to determine temporality (when drivers change their behavior) and directionality (does lower comfort lead to driving restrictions or vice versa), this is the first study to demonstrate that driver perceptions are associated with actual self-regulatory practices.

Preliminary outcome evaluation of the First Step Program: a daily physical activity intervention for individuals with type 2 diabetes

The First Step Program uses simple and inexpensive pedometers to incrementally increase walking behaviors in sedentary individuals with type 2 diabetes. The pilot sample consisted of nine individuals (six women, three men; group mean age 53+/-6; group mean body mass index=32.9+/-3.4kg/m(2)). A timed self-paced walk while wearing the pedometer allowed for the conversion of changes in pedometer steps per day to time in minutes per day. There was an immediate and dramatic increase in walking behavior (an average of 34.3min of walking a day) that was sustained even 2 months post-intervention and after withdrawal of contact (an average of 22.6min of walking a day). Improvements in other outcomes (systolic blood pressure and waist girth) support a valid change in behavior. Although preliminary, these results warrant further investigation of such approaches.

Development of a theory-based daily activity intervention for individuals with type 2 diabetes.

PURPOSE This article describes a theory-driven approach to developing a physical activity intervention for sedentary individuals with type 2 diabetes. METHODS Development of the intervention was based on 6 essential elements of program theory: problem definition, critical inputs, mediating processes, expected outcomes, extraneous factors, and implementation issues. Each element was formulated based on available literature and in collaboration with both intended service deliverers (diabetes educators) and recipients (sedentary persons with type 2 diabetes). RESULTS Diabetes education requires a simple physical activity intervention template that is feasible, acceptable, and effective in a variety of settings. Successful programs are individualized, specific, flexible, and based on walking. Pedometers have potential as self-monitoring and feedback tools. The primary expected outcome is an increase in physical activity, specifically walking. Behavior modification and social support are critical to adoption and adherence. CONCLUSIONS Theory-driven interventions specify what works for whom and under what conditions of delivery. The underlying theoryguides the evaluation, refinement, and clinical replication of an intervention. Recruitment, delivery, and follow-up are realworld implementation issues.

Implementation, Process, and Preliminary Outcome Evaluation of Two Community Programs for Persons with Stroke and Their Care Partners

Abstract Purpose: This evaluation compared a new self-management program with land and water exercise (Moving On after STroke or MOST) to a standard education program (Living with Stroke or LWS). Participants: Of 30 persons with stroke (average age 68 and 2 years post stroke), 18 selected MOST and 12 chose LWS. Sixteen care partners participated. Method: Assessments at baseline, program completion, and 3-month follow-up included the Reintegration to Normal Living (RNL) Index, Activity-specific Balance Confidence (ABC) scale, exercise participation, and goal attainment (for the MOST group). Program delivery costs were calculated and focus groups conducted to examine participant expectations and experiences. Results: Social support was an important benefit of both programs, but only MOST participants improved significantly on the RNL (p < .05) and ABC (p < .001). Seventy-eight percent of all short-term personal goals in MOST were achieved, and overall goal attainment was above the expected level. At follow-up, a higher percentage of MOST participants were enrolled in exercise programs (p < .05). Conclusion: Although self-management programs with exercise are more costly to deliver than standard educational programs, these preliminary results indicate that such programs may be more effective in helping persons with stroke and care partners deal with the challenges of living with stroke.

Correspondence Among Older Driversʼ Perceptions, Abilities, and Behaviors

To examine correspondence among perceptions, abilities, and behaviors, 71 drivers (aged 63–93 years) completed the Driving Comfort Scales and measures of perceived abilities, driving frequency, and avoidance. A subgroup (n = 42) also completed vision, reaction time, mobility, executive skills, and visual attention tasks. Driving patterns were more strongly related to perceived comfort and abilities than to objective performance. Drivers with discrepancies between perceived abilities and actual abilities (indicating lack of awareness) were more confident and less likely to regulate their driving. Clinicians working with older drivers should assess their perceptions, particularly comfort level, in addition to driving-related abilities.

Clinical Experience with Goal Attainment Scaling in Geriatric Care

Objectives: This article presents a qualitative evaluation of the utility of Goal Attainment Scaling (GAS) in geriatric care. GASis an individualized outcome measure particularly suited for clients with multiple complex problems, such as are commonly served by geriatric programs. Methods: Semistructured interviews were completed with 24 clinicians in four hospital or community-based geriatric services where GAS has been used. An inductive analysis was used to identify themes. Results: GAS was described as resulting in shorter lengths of stay, more focused care, and improved team functioning. GAS was perceived as having greater use for functional (versus medical) goals, when clinicians had more direct control over treatments, when patients were involved in goal-setting, and when goals were set by an interdisciplinary team. Discussion: GAS has affected both care practices and patient outcomes. This study illustrates the clinical impacts an outcome measure can have, as well as the use of qualitative methods for this type of research.