Intercomparison of bidirectional reflectance distribution function measurements at in- and out-of-plane geometries.

In recent years, there has been a growing interest in the measurements of the bidirectional reflectance distribution function (BRDF) in industry and research and development. However, there is currently no dedicated key comparison to demonstrate the scale conformity. To date, scale conformity has been proved only for classical in-plane geometries, in comparisons between different national metrology institutes (NMIs) and designated institutes (DIs). This study aims at expanding that with nonclassical geometries, including, for the first time, to the best of our knowledge, two out-of-plane geometries. A total of four NMIs and two DIs participated in a scale comparison of the BRDF measurements of three achromatic samples at 550 nm in five measurement geometries. The realization of the scale of BRDF is a well-understood procedure, as explained in this paper, but the comparison of the measured values presents slight inconsistencies in some geometries, most likely due to the underestimation of measurement uncertainties. This underestimation was revealed and indirectly quantified using the Mandel-Paule method, which provides the interlaboratory uncertainty. The results from the presented comparison allow the present state of the BRDF scale realization to be evaluated, not only for classical in-plane geometries, but also for out-of-plane geometries.

[Late-life depression and frailty-Epidemiological, clinical and neurobiological associations]. / Depression im Alter und Frailty ­ epidemiologische, klinische und neurobiologische Zusammenhänge.

BACKGROUND: Depression is the most common mental disorder in older adults and is influenced by age-related processes. Frailty is a well-established clinical expression of ageing that implies a state of increased vulnerability to stressor events as well as increased risks of disability, hospitalization and death. Neurobiological findings will disentangle the comorbidity of frailty and depression and may inform future management of depression in old age. OBJECTIVE: This narrative review provides an overview of the comorbidity of late-life depression and frailty, with a focus on neuroscientific findings that are organized within the research domain criteria (RDoC) framework. RESULTS: More than one third of old people with depression are affected by frailty, which results in more chronic depression and in poorer efficacy and tolerability of antidepressant medication. Depression and frailty share motivational and psychomotor characteristics, particularly apathy, decreased physical activity and fatigue. In patients with frailty, altered activity of the supplementary motor cortex is associated with motor performance deficits. Patients with late-life depression and apathy are characterized by abnormal structure and altered functional connectivity of the reward network and the salience network, along with altered functional connectivity of these networks with premotor brain areas. CONCLUSION: Identifying frailty in older adults with depression is relevant for prognostic assessment and treatment. A better understanding of the neuronal mechanisms of comorbidity will provide potential targets for future personalized therapeutic interventions.

Development of a standard fall data format for signals from body-worn sensors : the FARSEEING consensus.

Objective measurement of real-world fall events by using body-worn sensor devices can improve the understanding of falls in older people and enable new technology to prevent, predict, and automatically recognize falls. However, these events are rare and hence challenging to capture. The FARSEEING (FAll Repository for the design of Smart and sElf-adapaive Environments prolonging INdependent livinG) consortium and associated partners strongly argue that a sufficient dataset of real-world falls can only be acquired through a collaboration of many research groups. Therefore, the major aim of the FARSEEING project is to build a meta-database of real-world falls. To establish this meta-database, standardization of data is necessary to make it possible to combine different sources for analysis and to guarantee data quality. A consensus process was started in January 2012 to propose a standard fall data format, involving 40 experts from different countries and different disciplines working in the field of fall recording and fall prevention. During a web-based Delphi process, possible variables to describe participants, falls, and fall signals were collected and rated by the experts. The summarized results were presented and finally discussed during a workshop at the 20th Conference of the International Society of Posture and Gait Research 2012, in Trondheim, Norway. The consensus includes recommendations for a fall definition, fall reporting (including fall reporting frequency, and fall reporting variables), a minimum clinical dataset, a sensor configuration, and variables to describe the signal characteristics.

[Patients with dementia as a secondary diagnosis. Care in geriatric inpatient rehabilitation]. / Patienten mit Begleitdiagnose Demenz : Versorgung in der stationären geriatrischen Rehabilitation.

More than one-third of geriatric inpatients suffer from dementia as a secondary diagnosis. The number of patients with dementia and other age-related diseases is increasing as the population ages. Geriatric inpatient rehabilitation has been recognized as an efficient tool to restore functional impairment and improve outcomes related to functional dependence in old age. For patients with cognitive impairment, the situation is still controversial. Inpatient rehabilitation specifically designed for older adults with cognitive impairment, addressing the specific needs of this group, is still lacking. This review summarizes the current state of research and introduces an inpatient rehabilitation model developed and evaluated for patients with mild to moderate dementia as secondary diagnosis.

Test-retest reliability and minimal detectable change of repeated sit-to-stand analysis using one body fixed sensor in geriatric patients.

A majority of geriatric patients experience difficulty in performing sit-to-stand (SiSt) transitions. A detailed assessment of SiSt ability is a prerequisite for successful rehabilitation. Body fixed sensors (BFSs) are increasingly used to assess functional performances. As to date there is no system which analyzes clinically relevant phases of SiSt, the aim of this study was to determine the reliability of an automated approach for quantifying durations and angular velocities of trunk flexion and extension during repeated SiSt transitions using one BFS (DynaPort® Hybrid). Forty multimorbid geriatric patients aged 84.1 ± 6.6 years were included. Each patient participated in two test sessions with a 5 min rest period in between. Intra- and interrater reliability was assessed. Intraclass correlation coefficients (ICCs), absolute and relative standard measurement errors (SEMs, SEMs%) and minimal detectable changes (MDCs(95), MDCs(95)%) were calculated. ICCs were good to excellent for all variables in the total sample (0.80-0.94). The intraobserver group (50%) showed a higher number of excellent ICCs (≥.9) compared to the interobserver subgroup (10%). SEM% was low for all variables (6.9-12.7%). MDC(95)% ranged 19.2-34.4% and more variables ≤30% were found in the intra- (80%) compared to the inter-observer group (60%). Study results demonstrate that the BFS system provides a reliable analysis of SiSt phases in geriatric patients, and is a substantial improvement over the stopwatch approach used in clinical practice today.

[Effects of physical activity and physical training on the psychological status of older persons with and without cognitive impairment]. / Effekte körperlicher Aktivität und körperlichen Trainings auf den psychischen Status bei älteren Menschen mit und ohne kognitive Schädigung.

Fear of falling and depression in the elderly and among cognitively impaired people lead to restrictions in quality of life. Being more active is associated with improved mental health as documented in cross-sectional and longitudinal studies. This is especially true for depression. Such epidemiologic evidence is lacking in fear of falling. This review summarizes current evidence from epidemiological and randomized controlled trials (RCTs) and gives an outlook for future research perspectives. The majority of studies included in this review document a significant reduction of depression and fear of falling in older persons by physical training with less evidence in persons with cognitive impairment. With respect to intensity, duration, and amount of exercise, evidence-based recommendations were limited by the small number of high-quality comparative RCTs. High-intensity strength or endurance training was the most effective for reducing depression, while participation in Tai-Chi or multifactorial training programs was most effective to reduce fear of falling.

ARGon3: "3D appearance robot-based gonioreflectometer" at PTB.

At the Physikalisch-Technische Bundesanstalt, the National Metrology Institute of Germany, a new facility for measuring visual appearance-related quantities has been built up. The acronym ARGon(3) stands for "3D appearance robot-based gonioreflectometer". Compared to standard gonioreflectometers, there are two main new features within this setup. First, a photometric luminance camera with a spatial resolution of 28 µm on the device under test (DUT) enables spatially high-resolved measurements of luminance and color coordinates. Second, a line-scan CCD-camera mounted to a spectrometer provides measurements of the radiance factor, respectively the bidirectional reflectance distribution function, in full V(λ)-range (360 nm-830 nm) with arbitrary angles of irradiation and detection relative to the surface normal, on a time scale of about 2 min. First goniometric measurements of diffuse reflection within 3D-space above the DUT with subsequent colorimetric representation of the obtained data of special effect pigments based on the interference effect are presented.

[Palliative geriatrics. What are the differences between oncologic and non-oncologic palliative geriatric inpatients?]. / Palliative Geriatrie. Wie unterscheiden sich onkologische von nichtonkologischen geriatrischen Palliativpatienten im Krankenhaus?

AIM OF THE STUDY: Analysis of differences between oncologic and non-oncologic patients in the first German hospital-based special care unit for palliative geriatrics. METHODS: Systematic analysis of patients' records according to a standardized protocol. RESULTS: A total of 217 patients from a hospital-based special care unit for palliative geriatrics (56.7% women, 43.4% men) were included over a retrospective period of 1.5 years. Patients were categorized as non-oncologic (53.4%, n=116) or oncologic (46.5%, n=101). Non-oncologic patients were older than oncologic patients (84.0 vs. 76.8 years, p=0.02), and showed a higher degree of functional dependence (p<0.001) and mortality (87.1% vs. 53.3%, p<0.001). The two most common non-oncologic categories of primary diagnoses were pulmonary and neurologic diseases: 19% each. Certain secondary diagnoses had a higher incidence with non-oncologic than oncologic patients, such as pulmonary disease (39% vs. 24%, p=0.02) and dementia (38% vs. 8%, p<0.001). The Charlson comorbidity index was found to be higher for oncologic patients than for non-oncologic patients (6.6 vs. 4.1, p=0.001). Non-oncologic patients also experienced more dysphagia (57% vs. 17%, p<0.001), NPO (43% vs. 12%, p<0.001), and tube or parenteral feeding (31% vs. 9%, p=0.001). Oncologic patients experienced more often symptoms of pain, constipation, agitation, diarrhea, vomiting, and nausea. CONCLUSION: There are clinically relevant differences between oncologic and non-oncologic palliative geriatric inpatients regarding the constellation of symptoms, care, mortality, and the prevalence of concerns about hydration and feeding. These differences ought to be taken into account for further education, as well as further improvement of the healthcare system, to enable an appropriate standard of palliative care for geriatric patients.

Validation of the Falls Efficacy Scale and Falls Efficacy Scale International in geriatric patients with and without cognitive impairment: results of self-report and interview-based questionnaires.

BACKGROUND: Frail, old patients with and without cognitive impairment are at high risk of falls and associated medical and psychosocial issues. The lack of adequate, validated instruments has partly hindered research in this field. So far no questionnaire documenting fall-related self-efficacy/fear of falling has been validated for older persons with cognitive impairment or for different administration methods such as self-report or interview. OBJECTIVE: To validate the self-report and interview version of the Falls Efficacy Scale (FES) and the Falls Efficacy Scale International Version (FES-I) in frail geriatric patients with and without cognitive impairment. METHODS: 156 geriatric patients in geriatric rehabilitations wards with (n = 75) and without cognitive impairment (n = 81) were included in this study. Reports of fall-related self-efficacy were based on self-reported and interview-based questionnaires. Descriptive statistics, reliability estimates and validation results were computed for the total group and sub-samples with respect to cognitive status, for the 2 different questionnaires (FES/FES-I) and for the 2 administration methods. Test-retest reliability was tested in a subsample of 62 patients. RESULTS: Internal reliability and test-retest reliability were good to excellent in both the FES and FES-I, with the FES-I showing better internal reliability and the FES better test-retest reliability with respect to cognitively impaired persons. The group of cognitively impaired persons tended to show lower test-retest reliability and mean fall-related self-efficacy and had significantly lower completion rates in self-administered questionnaires. As indicated by significant differences in parameters closely related to falls, such as vertigo, functional performances, fear of falling and history of falls, both the FES and the FES-I showed good construct validity. Effect sizes computed for the above-mentioned groups for fall-related parameters confirmed the results of construct validation. CONCLUSION: Both the FES as well as the FES-I showed good to excellent measurement properties in persons with and without moderate cognitive impairment. In frail older persons, especially in persons with cognitive impairment, an interview-based administration method is recommended.

Evaluation of the incidental and planned activity questionnaire (IPEQ) for older people.

OBJECTIVE: There is a need for a measure of physical activity that assesses low, basic and high-intensity activities suitable for use in ageing research including falls prevention trials. This study performed a formal validation of the incidental and planned activity questionnaire (IPEQ) by investigating its overall structure and measurement properties. DESIGN: Cross-sectional survey. SETTING: Community sample. PARTICIPANTS: 500 older people (mean age 77.4 years, SD 6.08). MAIN OUTCOME MEASURES: The IPEQ was administered as part of a longer assessment in two different postal self-completion formats; one for estimating physical activity during the past week (IPEQ-W) and one for estimating average weekly physical activity over the past 3 months (IPEQ-WA). Test-retest reliability was assessed by the re-administration of the instruments one week later in a subsample of 80 respondents. RESULTS: Both IPEQ versions had good measurement properties, but overall the IPEQ-WA performed better than the IPEQ-W. Rasch analyses indicated the IPEQ-WA had an excellent overall fit. Analysis of the internal structure supported the unidimensionality of the scale with an acceptable internal consistency. The content representation of the items revealed three categories (low, moderate and high levels of physical activity), with a good contribution of items by threshold. The IPEQ-WA had excellent test-retest reliability, intraclass correlation coefficient 0.87) and was able to discriminate differences in physical activity levels between groups differentiated by sex, age and fall risk factors. CONCLUSIONS: The IPEQ has excellent psychometric properties and assesses the level of physical activity relating to both basic and more demanding activities. Further research is required to confirm sensitivity to change.

Repressive coping in geriatric patients' reports - impact on fear of falling.

We investigated the influence of repressive coping, depression, cognition, education and age on geriatric patients' reports on health-related status in 80 geriatric patients with a history of injurious falls. For patient reports, subjective statements on activity avoidance, perception of terminal decline, falls, and fear of falling were assessed. Co-morbidity and number of medications were documented based on patient charts. Repressive coping was significantly associated with underreporting in geriatric patients in all items documented and predicted most variables of patients' reports. Because of underreporting significant health problems geriatric patients with repressive coping may therefore be at risk for inadequate medical treatment.

Designing studies on the effectiveness of physical training in patients with cognitive impairment.

The literature provides conflicting results on the effectiveness of physical training in cognitively impaired older individuals. Cognitive impairment has been shown to be a negative predictor of rehabilitation outcome in these persons. However, the evidence on which this discussion is based is scarce. The methodology used in previous studies shows substantial shortcomings. The presented study protocol documents the methodology of one of the largest intervention studies worldwide in this research field with a standardized specific training program in cognitively impaired subjects including short- and long-term follow-up examinations. The selected sensitive evaluation tools for motor, cognitive and emotional status have all been validated for use in older persons. Most of these tests have been validated in cognitively impaired persons. In contrast to most previously published RCTs only study participants within a comparable level of cognitive impairment will be included in the study. The primary aim of the study is to evaluate a specific training program to improve motor performance (strength and functional performance) in persons with cognitive impairment. Secondary study endpoints include the reduction of falls, improvement of cognitive as well as psychological status and the documentation of physical activity. The training program is based on previous successful intervention studies of the research group, was complemented and modified with respect to specific deficits of cognitively impaired persons and focuses on motor improvements. The article gives a rationale for interventions using physical training and study methodology in persons with dementia.

Distance to achieve steady state walking speed in frail elderly persons.

This study aims to determine the length of the gait initiation phase before achieving steady state walking in frail older people. Based on body fixed sensors, habitual walking was analysed in 116 community-dwelling older persons (mean age 83.1 years, 84% women). The start of steady state walking was identified using an algorithm taking into account speeds from consecutive strides. On average, participants reached a walking speed of 0.66 m/s after an acceleration phase of 1.43 m (89% after 2.47 m). When spatio-temporal variables were calculated from 4, 6, 8, 10, or 20 consecutive stride cycles after achieving steady state, similar values were observed for mean gait speed and stride length. The variability of these factors differed depending on the number of gait cycles. Assessments of steady state gait in frail elderly people should therefore exclude the first 2.5m of walking. If gait variability is to be assessed, it is recommended that more than 20 stride cycles be used.

Recommendations for promoting the engagement of older people in activities to prevent falls.

OBJECTIVE: To develop recommendations for promoting uptake of and adherence to falls-prevention interventions among older people. DESIGN: The recommendations were initially developed from literature review, clinical experience of the core group members, and substantial qualitative and quantitative studies of older people's views. They were refined through a consultation process with members of the falls-prevention community, drawing on Delphi survey and nominal group techniques. Transparency was enhanced by recording and reporting aspects of the iterative consultation process such as the degree of consensus and critical comments on drafts of the recommendations. SETTING: The recommendations were developed and refined at three meetings of the core group, and through internet-based consultation and two meetings involving members of the wider falls-prevention community. PARTICIPANTS: The authors developed the recommendations incorporating the feedback from the researchers and practitioners responding to a broad-based internet consultation and consulted in the meetings. RESULTS: A high degree of consensus was achieved. Recommendations addressed the need for public education, ensuring that interventions were compatible with a positive identity, tailoring interventions to the specific situation and values of the individual, and using validated methods to maintain longer-term adherence. CONCLUSION: These recommendations represent a consensus based on current knowledge and evidence, but the evidence base from which these recommendations were developed was limited, and not always specific to prevention of falls. To increase the effectiveness of falls-prevention interventions, further research is needed to identify the features of falls-prevention programmes that will encourage older people's engagement in them.

Effectiveness of physical training on motor performance and fall prevention in cognitively impaired older persons: a systematic review.

OBJECTIVE: To determine whether older cognitively impaired people benefit from physical training with regard to motor performance or fall risk reduction and to critically evaluate the methodologic approach in identified randomized controlled intervention trials. DESIGN: Published randomized controlled intervention trials from 1966 through 2004 were identified in PubMed, CINAHL, Gerolit, and the Cochrane Central Register of Controlled Trials according to predefined inclusion criteria and evaluated by two independent reviewers using a modified rating system for randomized controlled intervention trials developed by the Cochrane Library. RESULTS: There were 11 randomized controlled intervention trials that met the predefined inclusion criteria. There was a large heterogeneity regarding methodology, sample size, type of intervention, study outcomes, and analyses. We found conflicting evidence regarding the effect of physical training on motor performance and falls in older people with cognitive impairment. However, a considerable number of the studies had methodologic limitations, which hampered the evaluation of the effectiveness of training. CONCLUSIONS: The randomized controlled intervention trials showed only limited effectiveness of physical training in patients with cognitive impairment. More studies with adequate sample size, sensitive and validated measurements, and higher specificity for the types of intervention targeting subgroups of patients with different degrees of cognitive impairment are required to give evidence-based recommendations.

[The German version of the Falls Efficacy Scale-International Version (FES-I)]. / Die Deutsche Version der Falls Efficacy Scale-International Version (FES-I).

The German version of the Falls Efficacy Scale-International Version (FES-I), which is presented, was developed for the documentation of fall-related selfefficacy in older persons by a EU-funded expert network (Prevention of Falls Network Europe ProFaNE). The FES-I represents a modification of the original Falls Efficacy Scale (FES), including additional items on complex functional performances and social aspects of falls. The FES-I shows high internal reliability (Cronbach's alpha = 0.96) as well as high test-retest reliability (r=0.96). The mean inter-item correlation was: r = 0.55 (Range r = 0.29-0.79). Results of validation studies for the FES-I in community dwelling older persons for different European countries and geriatric patients with cognitive impairment will be published in the near future.

[Physical exercise in old age]. / Körperliches Training im Alter.

For the prevention of diseases and especially functional deficits in old age, physical activity is a simple, practicable and successful method. With increasing age and frailty or in rehabilitation training, these activities have to be more and more individualized and medically supervised. The paper defines from today's viewpoint suitable activities and the amount of training necessary. Finally, the need for research about physical training in geriatric medicine is pointed out.

[Satisfaction of geriatric patients with their pain therapy. Wish and reality]. / Zufriedenheit geriatrischer Patienten mit ihrer Schmerztherapie. Wunsch und Wirklichkeit.

AIM: The goal of this study was to determine the level of satisfaction of geriatric patients with their pain therapy, their wishes for improved treatment, and possible influencing factors. METHODS: From April to November 2002, all patients able to communicate ( n=1432) were included in the study if they had reported pain in the previous 7 days or were taking regular analgesic medication without specifying pain. RESULTS: Of the geriatric patients reporting from home, 36.4% were not satisfied with their pain therapy up to that time, and 25.4% of surgical patients were dissatisfied as were 28.5% of patients treated in other departments. A total of 93.3% desired better pain treatment. Independent predictors for dissatisfaction with their therapy or wish for improvement were increasing pain intensity, frequent concomitant complaints in addition to pain, and the objectively perceived everyday competence. CONCLUSION: This study supports the observation that competent pain therapy is necessary and that there is room for improvement in geriatric facilities. Measuring pain intensity, posing questions pertaining to satisfaction with pain therapy, and determining whether patients desire better pain treatment are all indispensable for optimal care. Pain therapy should equally address reduction of pain intensity and management of other complaints.

[Problems recognizing pain in geriatrics]. / Probleme bei der Erkennung von Schmerzen in der Geriatrie.

OBJECTIVE: Elderly people often present substantial problems in pain assessment. The aim of the study was to quantify and discuss the problem of recognizing pain in hospitalized geriatric patients. METHODS: 124 geriatric patients and their treating doctors were questioned about pain, pain intensity and influence of pain on daily living in a cross-sectional-study. The score of the Barthel index (activity of daily living, ADL) at admittance and discharge, the cognitive status (monumental status of Folstein, MMS), the use of analgetic drugs and the medical diagnoses were assessed. The answers of the question "Did you/your patient have pain in the past seven days?" from patients and doctors were used to make seven groups. RESULTS: 20 (16,1%) patients could not answer the question about pain. In comparison to the group of patients who were able to answer, they were restricted in ADL and MMS. However, the answers of doctors about pain did not differ. 25 (20,3%) answers of treating doctors were wrong compared to the answers of the patients. In these cases, intensity and influence of pain on daily living were estimated low by the patients. In 14 (11,3%) patients, doctors could not state about pain. These patients were least restricted in ADL at admission and discharge. Altogether, the pain of 13/46 (28,3%) patients was treated insufficiently at the day of the interview. CONCLUSIONS: In half of the geriatric patients, pain was not well or not at all recognized by the treating doctors. Pain of not communicative patients was assessed similarly by the doctor as that of patients who were able to give information. In this geriatric hospital, little support at admittance and a superior improvement in the activities of daily living during the in-hospital treatment lead to less attention to pain by the doctor. The importance of pain therapy in geriatrics is illustrated by the fact that almost every third patient with pain is treated insufficiently at the day of the interview.