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Publications

Fall-related gait characteristics on the treadmill and in daily life

Rispens, S.M., et al.
Dec 2016

The present study aimed to assess differences as well as associations between fall-related gait characteristics measured on a treadmill and in daily life.

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Social and environmental determinants of physical activity in patients with chronic obstructive pulmonary disease (COPD)

Gimeno-Santos, E., et al.
Nov 2016

The aim was to assess the association between patients' social and environmental characteristics, and PA amount and intensity.

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Transition Between the Timed up and Go Turn to Sit Subtasks: Is Timing Everything?

Weiss, A., et al.
Sep 2016

We tested the hypothesis that longer transition durations between the final turn to the sitting subtasks are associated with worse motor and cognitive performance in older adults.

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Can a single lower trunk body-fixed sensor differentiate between level-walking and stair descent and ascent in older adults? Preliminary findings

Weiss, A., et al.
Jul 2016

Here, we aim to differentiate between level-walking and between stair descent and ascent using a single body fixed sensor, a 3D accelerometer integrated with a 3D gyroscope placed on the lower trunk in healthy older adults.

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The Instrumented Sit-to-Stand Test (iSTS) Has Greater Clinical Relevance than the Manually Recorded Sit-to-Stand Test in Older Adults

Van Lummel, R.C. et al.
Jul 2016

The purpose of the current study was to examine the hypothesis that test durations as assessed with the instrumented repeated Sit-To-Stand (STS) show stronger associations with health status, functional status and daily physical activity of older adults than manually recorded test durations.

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Daily-Life Gait Quality as Predictor of Falls in Older People: A 1-Year Prospective Cohort Study

Van Schooten, K.S., et al.
Jul 2016

We determined the relationship between the likelihood of fall incidents and daily-life behavior. We used wearable sensors to assess habitual physical activity and daily-life gait quality (in terms of e.g. stability, variability, smoothness and symmetry), and determined their predictive ability for time-to-first-and-second-falls.

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Quantitative Timed-Up-and-Go Parameters in Relation to Cognitive Parameters and Health-Related Quality of Life in Mild-to-Moderate Parkinson’s Disease

Van Uem J.M.T., et al.
Apr 2016

We were interested in the relative contributions of respective iTUG sub-phases to specific clinical deficits most relevant for daily life in Parkinson’s disease (PD).

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A novel accelerometry-based algorithm for the detection of step durations over short episodes of gait in healthy elderly

Micó-Amigo, M.E., et al.
Apr 2016

The aim of this study was to evaluate the accuracy of a novel algorithm based on acceleration signals recorded at different human locations (lower back and heels) for the detection of step durations over short episodes of gait in healthy elderly subjects.

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Minimal correlation between physical exercise capacity and daily activity in patients with intermittent claudication

Gommans, L.N.M., et al.
Apr 2016

A cross-sectional study was conducted to assess the association between several physical exercise capacity outcomes and physical activity in a general intermittent claudication population.

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The validity of assessing temporal events, sub-phases and trunk kinematics of the sit-to-walk movement in older adults using a single inertial sensor

Walgaard S., et al.
Mar 2016

The aim of this study was to develop a method to identify temporal events, sub-phases and trunk kinematics of the sit-to-walk (STW) using a single inertial sensor (IS) worn at the lower back and to determine the validity of this method.

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A systematic review of the characteristics and validity of monitoring technologies to assess Parkinson’s disease

Godinho, C., et al.
Mar 2016

This study proposes a systematic review of current literature aiming to (i) list, (ii) compare and (iii) classify technology-based devices that objectively measure PD motor symptoms.

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Decreased physical activity in adults with bronchial asthma

Van 't Hul, A.J., et al.
Mar 2016

The present study was designed to compare physical activity, objectively measured with an activity monitor, between adults with bronchial asthma and apparently healthy controls.

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Intra-Rater, Inter-Rater and Test-Retest Reliability of an Instrumented Timed Up and Go (iTUG) Test in Patients with Parkinson’s Disease

Van Lummel. R.C., et al.
Mar 2016

The aim of this study was to determine intra-rater, inter-rater and test-retest reliability of the iTUG in patients with Parkinson’s Disease.

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Can health status questionnaires be used as a measure of physical activity in COPD patients?

Demeyer, H., et al.
Feb 2016

The aims of the present analyses were 1) to describe the relationship between objectively measured physical activity and responses to health status questionnaires, and 2) to assess the utility of these questionnaires to screen for severe physical inactivity (SPI) in this population.

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Enhancing exercise tolerance and physical activity in COPD with combined pharmacological and non-pharmacological interventions: PHYSACTO randomised, placebo-controlled study design

Trooster, T., et al.
Feb 2016

We describe the design of the PHYSACTO trial, which is investigating the effects of bronchodilators, either alone or with exercise training, in combination with a standardised behaviour-change self-management programme, on exercise capacity and physical activity in patients with COPD. It is hypothesised that bronchodilators in conjunction with a behaviourchange self-management programme will improve physical activity and that this effect will be amplified by the addition of exercise training.

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Patients’ adherence to a walking programme for non-specific low back pain

Van Koppen, L.H., et al.
Jan 2016

The aim of this cross-sectional observational study was to investigate adherence rate and factors influencing the adherence in following home-based activity advice, in patients referred to a physiotherapy clinic for non-specific low back pain.

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Rivastigmine for gait stability in patients with Parkinson’s disease (ReSPonD): a randomised, double-blind, placebo-controlled, phase 2 trial

Henderson, E.J., et al.
Jan 2016

In the ReSPonD trial we aimed to assess whether ameliorating the cholinergic deficit with an acetylcholinesterase inhibitor rivastigmine would reduce gait variability

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Effect of calendar age on physical performance: A comparison of standard clinical measures with instrumented measures in middle-aged to older adults

Stijntjes, M., et al.
Dec 2015

We studied the association of calendar age and familial longevity with standard clinical and instrumented measures of physical performance in a cohort of healthy middle-aged to older adults.

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Physical performance and physical activity in older adults: associated but separate domains of physical function in old age

Van Lummel. R.C., et al.
Dec 2015

The objective was to examine whether 1) physical performance (PP) and physical activity (PA) constitute separate domains of physical function; 2) differentiation of PA classes is more informative than overall PA

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The effects of a physical activity counseling program after an exacerbation in patients with Chronic Obstructive Pulmonary Disease: a randomized controlled pilot study

Hornikx, M., et al.
Nov 2015

For this pilot study, we hypothesized that, through frequent PA counseling and real-time feedback, patients would potentially increase their PA level more rapidly in the month after an exacerbation compared to subjects in a control group, receiving usual care.

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Development of an integral assessment approach of health status in patients with obstructive airway diseases: the CORONA study

Van den Akker, E.F.M.M., et al.
Nov 2015

The COPD and Asthma Rotterdam Integrated Care Approach (CORONA) study aims to develop a diagnostic pathway with a more comprehensive approach to the assessment of patients with asthma and COPD in secondary care.

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The PROactive instruments to measure physical activity in patients with chronic obstructive pulmonary disease

Gimeno-Santos, E., et al.
Sep 2015

The aim of the current study was 1) to identify a comprehensive set of nonredundant items and monitor outputs that can be used to measure physical activity in COPD patients and 2) to perform an initial validation of the two instruments.

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Why detection of cycling is important in activity monitoring

Van Lummel. R.C., et al.
Sep 2015

This study aimed to evaluate the effects of misclassification of cycling with an activity monitor.

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Cycling detection with a single activity monitor

Frouws, S.C., et al.
Sep 2015

This abstract describes a method for detection of cycling.

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Mediolateral balance and gait stability in older adults

Lizama, L.E.C., et al.
Jun 2015

This study aimed to determine whether MELBA is an ecologically valid tool by correlating its outputs with a measure of mediolateral gait stability known to be predictive of falls.

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Step detection and activity recognition accuracy of seven physical activity monitors

Storm, F.A., et al.
Mar 2015

The aim of this study was to compare the seven following commercially available activity monitors in terms of step count detection accuracy: Movemonitor (Mc Roberts), Up (Jawbone), One (Fitbit), ActivPAL (PAL Technologies Ltd.), Nike+ Fuelband (Nike Inc.), Tractivity (Kineteks Corp.) and Sensewear Armband Mini (Bodymedia).

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High correlation of the Oxford knee score with postoperative pain, but not with performance-based functioning

Van Hove, R.P. et al.
Mar 2015

The Oxford Knee Score (OKS) is a widely known patient-related outcome measure(PROM) to determine pain and knee functioning before and after total knee arthroplasty (TKA).In this study it was hypothesized that the OKS correlates more with pain than with performance-based functioning.

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Frequent sputum production is associated with disturbed night’s rest and impaired sleep quality in patients with COPD

Hartman, J.E., et al.
Mar 2015

In this study, we measured night’s rest parameters measured with an accelerometer and sleep quality in mild to very severe patients with COPD. Furthermore, our aim was to investigate the association between night’s rest parameters and clinical variables and the association between sleep quality and quality of life or health status.

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Validation of an activity monitor during sleep in patients with chronic respiratory disorders

Gloeckl, R., et al.
Jan 2015

Objective of this study was to validate an activity monitor (DynaPort MoveMonitor [MM], McRoberts, The Hague, The Netherlands) against night-vision video analysis during sleep.

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Assessing Physical Activity in Older Adults: Required Days of Trunk Accelerometer Measurements for Reliable Estimation

Van Schooten, K.S., et al.
Jan 2015

We investigated the reliability of physical activity monitoring based on trunk accelerometry in older adults and assessed the number of measured days required to reliably assess physical activity.

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Do extreme values of daily-life gait characteristics provide more information about fall risk than median values?

Rispens, S.M., et al.
Jan 2015

The objective of this study was to improve fall-risk prediction models by examining whether the use of extreme values strengthens the associations with falls.

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Ambulatory fall-risk assessment: amount and quality of daily-life gait predict falls in older adults

Van Schooten, K.S., et al.
Jan 2015

We compared associations between retrospective and prospective falls with potential risk factors as measured by daily-life accelerometry. In addition, we investigated predictive value of these parameters for 6-month prospective falls.

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Limitation in tidal volume expansion partially determines the intensity of physical activity in COPD

Kortianou, E.A., et al.
Dec 2014

The purpose of the present study was to investigate whether differences in physical activity levels commonly adopted by individual patients with COPD in daily life compared with well-controlled laboratory environments are partly attributed to differences in the magnitude of mechanical limitation to total and compartmental (rib cage and abdominal) chest wall volumes.

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The effect of supervised exercise therapy on physical activity and ambulatory activities in patients with intermittent claudication

Fokkenrood, H.J.P., et al.
Nov 2014

The aim of this study was to investigate the effect of Supervised Exercise Therapy on Physical Activity levels and ambulatory activities in patients with Intermittent Claudication.

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Instrumented functional reach test differentiates individuals at high risk for Parkinson’s disease from controls

Hasmann, S.E., et al.
Oct 2014

This cross-sectional study aimed at investigating whether the instrumented Functional Reach test has the potential to differentiate individuals with high risk for Parkinson's Disease (HRPD) from controls, as the delineation of such individuals would allow for, e.g., early neuromodulation.

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Gait and balance in Parkinson’s disease subtypes: objective measures and classification considerations

Herman, T., et al.
Sep 2014

To better understand motor subtypes within Parkinson's disease, we objectively quantified gait and balance and their behavioral correlates.

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Physical activity monitoring in patients with peripheral arterial disease: validation of an activity monitor

Fokkenrood, H.J.P., et al.
Aug 2014

The aim of this study was to validate daily activities using a novel type of tri-axial accelerometer (Dynaport MoveMonitor) in patients with Intermittent Claudication.

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New evidence for gait abnormalities among Parkinson’s disease patients who suffer from freezing of gait: insights using a body-fixed sensor worn for 3 days

Weiss, A., et al.
Jul 2014

We evaluated whether long-term recordings of Parkinson patients with a 3-D accelerometer for 3 days reveal gait alterations in freezers and if these features were related to freezing severity and its impact on daily function.

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Effect of bed height and use of hands on trunk angular velocity during the sit-to-stand transfer

Lindemann, U., et al.
Jul 2014

This study was to investigate the effect of bed height and use of hands on trunk angular velocity and trunk angles during the sit-to-stand (STS) performance.

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Physical activity monitoring in patients with intermittent claudication

Lauret, G.J., et al.
Jun 2014

The aim of this study was to quantify daily Physical Activity level and energy expenditure of newly diagnosed patients with Intermittent Claudication and healthy controls.

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Physical activity recommendations in patients with chronic obstructive pulmonary disease

Hartman, J.E., et al.
May 2014

The objective of the current study was to compare individualized (relative) and nonindividualized (absolute) physical activity recommendations in patients with COPD and to assess whether there are differences between patients with mild to moderate and (very) severe COPD.

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Validation of a body-worn accelerometer to measure activity patterns in octogenarians

Taylor, L.M., et al.
May 2014

To determine the validity of a triaxial body-worn accelerometer for detection of gait and postures in people aged >80 years.

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Consistency of gait characteristics as determined from acceleration data collected at different trunk locations

Rispens, S.M., et al.
May 2014

We studied (outdoors) over-ground walking over repeated short-distances where we included turns to investigate gait parameters obtained from activities such as in a daily life setting.

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Association between performance on Timed Up and Go subtasks and mild cognitive impairment: further insights into the links between cognitive and motor function

Mirelman, A., et al.
Apr 2014

The objective was to assess whether different TUG subtasks are preferentially affected among older adults with mild cognitive impairment (MCI) and are specific to different cognitive abilities.

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Accuracy of three activity monitors in patients with chronic obstructive pulmonary disease: A comparison with video recordings

Andersson, M. et al.
Apr 2014

The aim of this study was to assess the accuracy and equivalency of three activity monitors regarding steps, body position and their ability to differentiate between periods of physical activity and inactivity.

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Automated detection of missteps during community ambulation in patients with Parkinson’s disease: a new approach for quantifying fall risk in the community setting

Iluz, T, et al.
Apr 2014

We developed an objective tool for detecting missteps under real-world, daily life conditions to enhance the evaluation of fall risk and applied this new method to 3 day continuous recordings.

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Identification of fall risk predictors in daily life measurements gait characteristics’ reliability and association with self-reported fall history

Rispens, S.M., et al.
Apr 2014

The aim of this study was to identify gait characteristics that are associated with self-reported fall history and that can be reliably assessed based on ambulatory data collected during a single week.

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Accelerometer-based quantitative analysis of axial nocturnal movements differentiates patients with Parkinson’s disease, but not high-risk individuals, from controls

Louter, M., et al.
Apr 2014

In this study we hypothesised that changes in nocturnal movement patterns might occur already in non-PD individuals with a potentially high risk for future development of the disease.

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Physical activity and physical fitness in lymphoma patients before, during, and after chemotherapy: a prospective longitudinal study

Vermaete N., et al.
Mar 2014

The aim of this longitudinal study was to assess fatigue, physical activity, and physical fitness in lymphoma patients before, during, and after treatment.

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Toward ambulatory balance assessment: estimating variability and stability from short bouts of gait

van Schooten, K.S., et al.
Feb 2014

This study aimed to explore the feasibility of using metrics of gait kinematics in clinical practice and ambulatory assessment, where only a small number of consecutive strides are available.

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Associations between quantitative mobility measures derived from components of conventional mobility testing and Parkinsonian gait in older adults

Buchman, A.S., et al.
Jan 2014

The objective of this study was to provide objective measures which characterize mobility in older adults assessed in the community setting and to examine the extent to which these measures are associated with parkinsonian gait.

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Validity and reliability of measuring activities, movement intensity and energy expenditure with the DynaPort MoveMonitor

de Groot, S., et al.
Oct 2013

The purpose of this study was to evaluate the validity and reliability of assessing activities, movement intensity (MI) and energy expenditure (EE) measured by accelerometry.

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Using a Body-Fixed Sensor to Identify Subclinical Gait Difficulties in Older Adults with IADL Disability: Maximizing the Output of the Timed Up and Go

Weiss, A., et al.
Jul 2013

We tested whether measures derived from a single body-fixed sensor worn during traditional Timed Up and Go (TUG) testing could identify subclinical gait impairments in community dwelling older adults without mobility disability.

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Automated approach for quantifying the repeated sit-to-stand using one body fixed sensor in young and older adults

Van Lummel, R.C., et al.
May 2013

The objectives of the present study were to describe the feasibility of using an automated approach for quantifying the STS using one sensor location and to start testing the discriminative validity of this approach by comparing older and younger adults.

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Validity of physical activity monitors during daily life in patients with COPD

Rabinovich, R.A.
Feb 2013

Our aim was to evaluate the validity and usability of six activity monitors in patients with COPD against the doubly labelled water (DLW) indirect calorimetry method.

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Validation of seat-off and seat-on in repeated sit-to-stand movements using a single-body-fixed sensor

Van Lummel, R.C., et al.
Oct 2012

The aim of this study is to validate seat-off and seat-on detection using a single-body-fixed sensor against detection based on chair switches.

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Validity and reliability of accelerometer-based gait assessment in patients with diabetes on challenging surfaces

De Bruin, E.D., et al.
Jun 2012

We investigate the test-retest reliability and construct validity of gait measured with the DynaPort MiniMod under single and dual task conditions in diabetic patients walking on irregular terrain to identify the measurement error (precision) and minimal clinical detectable change.

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Validity of six activity monitors in chronic obstructive pulmonary disease: a comparison with indirect calorimetry

Van Remoortel, H., et al.
Jun 2012

The aim was to evaluate the validity of six monitors in patients with COPD.

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Validation of a compact motion sensor for the measurement of physical activity in patients with chronic obstructive pulmonary disease

Sugino, A., et al.
Mar 2012

The validity of the Actimarker was evaluated in COPD patients.

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Validation of the triaxial accelerometer for the evaluation of physical activity in Japanese patients with COPD

Kanda, M., et al.
Feb 2012

We initially evaluated the reproducibility of the DAM in Japanese healthy subjects. Next, the within-subject repeatability and the determinants of physical activity were investigated in Japanese COPD patients.

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Validity of instruments to measure physical activity may be questionable due to a lack of conceptual frameworks: a systematic review

Gimeno-Santos, E., et al.
Oct 2011

This study, which was limited to a specific case, had the following aims: (i) to identify conceptual frameworks of physical activity in chronic respiratory patients or similar populations (chronic heart disease patients or the elderly) and (ii) to assess whether the development and validation of PROs to measure physical activity in these populations were based on a conceptual framework of physical activity.

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Detection of lying, sitting, standing and locomotion under free living conditions (24h): validation of a one sensor versus a multiple sensor approach

Van Lummel, R.C., et al.
Mar 2011

The aim of this study is to validate a newly developed activity monitor (DynaPort® MoveMonitor) during unsupervised daily life conditions.

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Validation of the DynaPort MiniMod during sleep: a pilot study

Bossenbroek, L., et al
Nov 2010

The goal was to examine the validity of the DynaPort MiniMod in assessing physical activity and body posture during sleep.

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Automated detection of near falls: algorithm development and preliminary results

Weiss, A., et al
Mar 2010

The purpose of the present study was to develop a method for automatic detection of near falls, potentially a sensitive, objective marker of fall risk and to demonstrate the ability to detect near falls using this approach.

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Validation of two activity monitors in patients with COPD

Langer, D., et al.
Jul 2009

We validated two smaller activity monitors in a sample of 10 patients with COPD.

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Estimating Activity-related Energy Expenditure Under Sedentary Conditions Using a Tri-axial Seismic Accelerometer

Van Hees, V.T., et al.
Jun 2009

The first aim of this study was to combine the type and the intensity of PA into one model for energy expenditure prediction. The second aim was to assess model validity under exclusively sedentary conditions.

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Athletic skill level is reflected in body sway: A test case for accelometry in combination with stochastic dynamics

Lamoth, C.J.C., et al.
Jun 2009

The aim of the present study was to determine – as spade work for possible clinical applications – whether body sway measured with a three-axial accelerometer at the trunk can differentiate between three healthy young populations that differ in athletic skill level.

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Concurrent validity of a trunk tri-axial accelerometer system for gait analysis in older adults

Hartmann, A., et al.
Apr 2009

The aim of this study was (1) to determine the concurrent validity of a trunk tri-axial accelerometer system (DynaPort®MiniMod) with the GAITRite® system for spatio-temporal gait parameters at preferred, slow and fast self-selected walking speed that were recorded for averaged and individual step data in an older adult population and (2) to compare the levels of agreement for averaged step data from different walking distances and individual step data.

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Reproducibility of a Triaxial Seismic Accelerometer (DynaPort)

Van Hees, V.T., et al.
Jan 2009

The purpose of the study was to examine the reproducibility of a triaxial seismic accelerometer under controlled conditions and real-life conditions.

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Quantity versus quality of gait and quality of life in patients with osteoarthritis

Brandes, M., et al.
Jul 2008

This study investigated the relationship between the quality of life, quality of gait and the quantity of gait in patients with impairments in the lower extremities.

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Physical activity levels after limb salvage surgery are not related to clinical scores—objective activity assessment in 22 patients after malignant bone tumor treatment with modular prostheses

Rosenbaum, D., et al.
Jun 2008

The aim of the present study was to objectively assess the physical activity levels of patients after tumor prosthesis implantation with two objective measurement devices.

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Detection of walking periods and number of steps in older adults and patients with Parkinson’s disease: accuracy of a pedometer and an accelerometry-based method

Dijkstra, B., et al.
May 2008

The aim of this study was to examine if walking periods and number of steps can accurately be detected by a single small body-fixed device in older adults and patients with Parkinson's disease (PD).

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Validity of DynaPort GaitMonitor for assessment of spatiotemporal parameters in amputee gait

Houdijk, J.H.P., et al.
Jan 2008

In this study, the validity of the DynaPort GaitMonitor software (McRoberts, The Hague, The Netherlands) for assessing spatiotemporal parameters of amputee gait was evaluated.

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Accelerometry based assessment of gait parameters in children

Brandes, M., et al.
Dec 2006

The objective of this study was to examine if spatio-temporal gait parameters in healthy children can be determined from accelerations measured at the lower trunk as has been demonstrated in adults, previously.

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Correlations between the step activity monitor and the DynaPort ADL-monitor

Brandes, M. & Rosenbaum, D.
Jan 2004

This study was performed to evaluate correlations between the DynaPort activity of daily living monitor and the step activity monitor.

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