As part of the second funding phase of AEQUIPA (Physical activity and health equity: primary prevention for healthy aging), the TUMAL (technology-supported motivation to maintain activity and quality of life) study is carried out in the Technology subproject.
The aim of the TUMAL study is to integrate, further develop and test the previous technical and medical results from the first project funding phase in order to realize an innovative and technology-based early detection of functional degradation in older people. For this purpose, technical systems are being developed which enable older people to carry out independent, partially supervised performance of established assessments of physical performance in environments such as senior citizens' clubs or sports clubs.
In the current second funding phase, a so-called "measuring box" is being developed in the subproject TUMAL, in which senior citizens can carry out particularly sensitive tests under video instruction independently:
5-Time-Chair-Rise - five times getting up from a chair
Timed-up-and-Go (TuG) - getting up from a chair, running 3 meters back and forth and sitting down
Nutritional screening based on the Short Mini Nutritional Assessment (MNA-SF)
By means of the portable inertial sensors and ambient sensor technology successfully used in AEQUIPA I, the test subjects are measured during the execution of these tests and the performance quality is evaluated.
The Heidelberg University will continue to accompany part of the VERSA cohort in assessments and compare the results with those of the measuring box data. The Jade-HS will examine both the usability and the acceptance of the measurement method in the various public or semi-public spaces and examine to what extent the older people can be motivated for a regular survey. On the basis of the regular test, specific programs for movement and nutritional interventions will be developed, which should counteract the reduction of physical performance.
As part of the project, the measuring box will be installed both at the university and at least one sports club, where it can be used as often as required by older people.
In this developed "measuring box", senior citizens can carry out particularly sensitive tests independently under video guidance:
5-Time-Chair-Rise - getting up from a chair five times
Timed-up-and-go (TuG) - getting up from a chair, walking 3 metres back and forth and sitting down
Nutritional screening based on the Short Mini Nutritional Assessment (MNA-SF)
Using the wearable inertial sensors and ambient sensors successfully used in AEQUIPA I, the test subjects are measured while performing these tests and the quality of their performance is assessed.
Heidelberg University will continue to accompany part of the VERSA cohort in assessments and compare the results with those of the measurement box data.
As part of the TUSMAL study(technology-supportedself-assessmentand motivationto maintainactivityand quality of life), a further measurement box was set up in a sports club (Bürgerfelder Turnerbund) where it is publicly accessible and can be used by older people as often as they wish.
The Jade-HS will investigate both the usability and the admission of the measurement procedure at the various public or semi-public locations and examine the extent to which older people can be motivated to take regular measurements. Based on the regular tests, specific programmes for exercise and nutritional interventions will then be developed to counteract the decline in physical performance.
L. C. Büker, F. Zuber, A. Hein, and S. Fudickar, "HRDepthNet: Depth Image-Based Marker-Less Tracking of Body Joints" Sensors, vol. 21, iss. 4.
2021.
doi: 10.3390/s21041356
@Article{Bueker2021,
author = {Büker, Linda Christin and Zuber, Finnja and Hein, Andreas and Fudickar, Sebastian},
TITLE = {HRDepthNet: Depth Image-Based Marker-Less Tracking of Body Joints},
JOURNAL = {Sensors},
VOLUME = {21},
YEAR = {2021},
NUMBER = {4},
ARTICLE-NUMBER = {1356},
URL = {https://www.mdpi.com/1424-8220/21/4/1356},
ISSN = {1424-8220},
ABSTRACT = {With approaches for the detection of joint positions in color images such as HRNet and OpenPose being available, consideration of corresponding approaches for depth images is limited even though depth images have several advantages over color images like robustness to light variation or color- and texture invariance. Correspondingly, we introduce High- Resolution Depth Net (HRDepthNet)—a machine learning driven approach to detect human joints (body, head, and upper and lower extremities) in purely depth images. HRDepthNet retrains the original HRNet for depth images. Therefore, a dataset is created holding depth (and RGB) images recorded with subjects conducting the timed up and go test—an established geriatric assessment. The images were manually annotated RGB images. The training and evaluation were conducted with this dataset. For accuracy evaluation, detection of body joints was evaluated via COCO’s evaluation metrics and indicated that the resulting depth image-based model achieved better results than the HRNet trained and applied on corresponding RGB images. An additional evaluation of the position errors showed a median deviation of 1.619 cm (x-axis), 2.342 cm (y-axis) and 2.4 cm (z-axis).},
DOI = {10.3390/s21041356}
}
S. Hellmers, L. Peng, S. Lau, R. Diekmann, L. Elgert, J. M. Bauer, A. Hein, and S. Fudickar, "Activity Scores of Older Adults based on Inertial Measurement Unit Data in Everyday Life" in Proc. Proceedings of the 13th International Joint Conference on Biomedical Engineering Systems and Technologies (BIOSTEC 2020) - Volume 5: HEALTHINF, Valetta (Malta), 2020.
doi: 10.5220/0009095505790585
@inproceedings{Hellmers2020, abstract = {The trend of an ageing population is becoming more and more obvious. Staying healthy in old age is an important social issue. Thereby, physical activity is essential for the preservation of physical function. We developed an algorithm for determining the activity level of seniors in everyday life. The proposed algorithm is based on machine learning activity detection using inertial measurement unit data. A series of activity scores is obtained by executing the algorithm from data on the type of activity, total activity time and activity intensity. To evaluate the performance of the proposed algorithm, a study with 251 participants aged above 70 (75.41 ± 3.88) years was conducted and the correlation between individual activity scores and clinical mobility assessments was determined. Results showed a relation between the Six Minute Walking Test and the total score in terms of activity level as well as the walk score. Additionally, the MVPA- and walk-score show a clear trend regarding the frailty status of the participants. Therefore, these scores are indicators of the physical function and hence validate the utility of the developed algorithm.},
address = {Valetta (Malta)},
author = {Hellmers, Sandra and Peng, Lianying and Lau, Sandra and Diekmann, Rebecca and Elgert, Lena and Bauer, J{\"{u}}rgen M. and Hein, Andreas and Fudickar, Sebastian},
booktitle = {Proceedings of the 13th International Joint Conference on Biomedical Engineering Systems and Technologies (BIOSTEC 2020) - Volume 5: HEALTHINF},
pages = {579--585},
publisher = {SCITEPRESS – Science and Technology Publications, Lda.},
title = {{Activity Scores of Older Adults based on Inertial Measurement Unit Data in Everyday Life}},
year = {2020},
doi = {10.5220/0009095505790585},
url = {https://doi.org/10.5220/0009095505790585}
}
R. Diekmann, S. Hellmers, L. Elgert, S. Fudickar, A. Heinks, S. Lau, J. M. Bauer, T. Zieschang, and A. Hein, "Minimizing comprehensive geriatric assessment to identify deterioration of physical performance in a healthy community-dwelling older cohort: longitudinal data of the AEQUIPA Versa study" Aging Clinical and Experimental Research.
2020.
doi: 10.1007/s40520-020-01562-8
@article{Diekmann2020, abstract = {It is important to identify the relevant parameters of physical performance to prevent early functional decline and to prolong independent living. The aim of this study is to describe the development of physical performance in a healthy community-dwelling older cohort aged 70+ years using comprehensive assessment over two years and to subsequently identify the most relevant predictive tests for physical decline to minimize assessment. Physical performance was measured by comprehensive geriatric assessment. Predictors for the individual decline of physical performance by Principal Component and k-means Cluster Analysis were developed, and sensitivity and specificity determined accordingly. 251 subjects ({\O} 75.4 years) participated in the study. Handgrip strength was low in 21.1{\%}. The follow-up results of tests were divergent. Handgrip strength [− 16.95 (SD 11.55)] and the stair climb power test (power) [− 9.15 (SD 16.84)] yielded the highest percentage changes. Four most relevant tests (handgrip strength, stair climb power time, timed up {\&} go and 4-m gait speed) were identified. A predictor based on baseline data was determined (sensitivity 82{\%},
specificity 96{\%}) to identify subjects characterized by a high degree of physical decline within two years. Although the cohort of older adults is heterogeneous, most of the individuals in the study exhibited high levels of physical performance; only a few subjects suffered a relevant decline within the 2-year follow-up. Four most relevant tests were identified to predict relevant decline of physical function. In spite of ceiling effects of the geriatric assessment in high-performers, we assume that it is possible to predict an individual's risk of physical decline within 2 years with four tests of a comprehensive geriatric assessment.},
author = {Diekmann, R. and Hellmers, S. and Elgert, L. and Fudickar, S. and Heinks, A. and Lau, S. and Bauer, J. M. and Zieschang, T. and Hein, A.},
doi = {10.1007/s40520-020-01562-8},
issn = {17208319},
journal = {Aging Clinical and Experimental Research},
pmid = {32358730},
publisher = {Springer International Publishing},
title = {{Minimizing comprehensive geriatric assessment to identify deterioration of physical performance in a healthy community-dwelling older cohort: longitudinal data of the AEQUIPA Versa study}},
year = {2020},
url = {https://doi.org/10.1007/s40520-020-01562-8}
}
S. Fudickar, S. Hellmers, S. Lau, R. Diekmann, J. M. Bauer, and A. Hein, "Measurement System for Unsupervised Standardized Assessment of Timed “Up & Go” and Five Times Sit to Stand Test in the Community—A Validity Study" Sensors, vol. 20, iss. 10, p. 2824.
2020.
doi: 10.3390/s20102824
@article{Fudickar2020a, abstract = {Comprehensive and repetitive assessments are needed to detect physical changes in an older population to prevent functional decline at the earliest possible stage and to initiate preventive interventions. Established instruments like the Timed “Up {\&} Go” (TUG) Test and the Sit-to-Stand Test (SST) require a trained person (e.g., physiotherapist) to assess physical performance. More often, these tests are only applied to a selected group of persons already functionally impaired and not to those who are at potential risk of functional decline. The article introduces the Unsupervised Screening System (USS) for unsupervised self-assessments by older adults and evaluates its validity for the TUG and SST. The USS included ambient and wearable movement sensors to measure the user's test performance. Sensor datasets of the USS's light barriers and Inertial Measurement Units (IMU) were analyzed for 91 users aged 73 to 89 years compared to conventional stopwatch measurement. A significant correlation coefficient of 0.89 for the TUG test and of 0.73 for the SST were confirmed among USS's light barriers. Correspondingly, for the inertial data-based measures, a high and significant correlation of 0.78 for the TUG test and of 0.87 for SST were also found. The USS was a validated and reliable tool to assess TUG and SST.},
author = {Fudickar, Sebastian and Hellmers, Sandra and Lau, Sandra and Diekmann, Rebecca and Bauer, J{\"{u}}rgen M. and Hein, Andreas},
doi = {10.3390/s20102824},
issn = {14248220},
journal = {Sensors},
keywords = {5xsst,assessment,evaluation,five times sit-to-stand test,functional,go,inertial,machine learning,measurement units,system usability,technology,test,timed,tug,unsupervised,up,validity analysis},
number = {10},
pages = {2824},
pmid = {32429306},
title = {{Measurement System for Unsupervised Standardized Assessment of Timed “Up {\&} Go” and Five Times Sit to Stand Test in the Community—A Validity Study}},
volume = {20},
year = {2020},
url = {https://doi.org/10.3390/s20102824}
}
S. Hellmers, S. Lau, R. Diekmann, L. Dasenbrock, T. Kromke, J. M. Bauer, S. Fudickar, and A. Hein, "Evaluation of Power-Based Stair Climb Performance via Inertial Measurement Units" in Proc. Biomedical Engineering Systems and Technologies, Cham, 2019.
@inproceedings{10.1007/978-3-030-29196-9_13,
author="Hellmers, Sandra and Lau, Sandra and Diekmann, Rebecca and Dasenbrock, Lena and Kromke, Tobias and Bauer, J{\"u}rgen M. and Fudickar, Sebastian and Hein, Andreas", editor="Cliquet Jr., Alberto and Wiebe, Sheldon and Anderson, Paul and Saggio, Giovanni and Zwiggelaar, Reyer and Gamboa, Hugo and Fred, Ana and Berm{\'u}dez i Badia, Sergi", title="Evaluation of Power-Based Stair Climb Performance via Inertial Measurement Units", booktitle="Biomedical Engineering Systems and Technologies", year="2019", publisher="Springer International Publishing", address="Cham", pages="238--261", abstract="The stair climbing test (SCT) is a standard geriatric assessment to measure lower-limb strength being one of the essential components of physical function. To detect functional decline as early as possible, regular assessments of mobility, balance, and strength are necessary. Inertial measurement units (IMU) are a promising technology for flexible and unobtrusive measurements of the SCTs. We introduce an automated assessment via IMUs in a study of 83 participants aged 70--87 (75.64 {\textpm} 4,17) years. The activity of stair ascending has been automatically classified via a k-nearest-neighbor classifier and the performance was evaluated regarding the power. Therefore, we considered both, stair climb average power and peak power. Stair ascending was correctly classified in 93{\%} of the cases with a mean deviation of 2.35{\%} of the average power value in comparison to conventional measurements. Additionally, we showed the medical sensitivity of our system regarding the detection of transitions towards the frail status in controlled conditions and also confirmed the general suitability of automated stair climb analyses in unsupervised home-assessments.", isbn="978-3-030-29196-9" }
S. Hellmers, S. Fudickar, S. Lau, L. Elgert, R. Diekmann, J. M. Bauer, and A. Hein, "Measurement of the Chair Rise Performance of Older People Based on Force Plates and IMUs" Sensors, vol. 19, iss. 6, p. 1370.
2019.
doi: 10.3390/s19061370
@Article{Hellmers2019,
author = {Hellmers, Sandra and Fudickar, Sebastian and Lau, Sandra and Elgert, Lena and Diekmann, Rebecca and Bauer, Jürgen M. and Hein, Andreas},
TITLE = {Measurement of the Chair Rise Performance of Older People Based on Force Plates and IMUs},
JOURNAL = {Sensors},
VOLUME = {19},
YEAR = {2019},
NUMBER = {6},
pages = {1370},
URL = {http://www.mdpi.com/1424-8220/19/6/1370},
ISSN = {1424-8220},
ABSTRACT = {An early detection of functional decline with age is important to start interventions at an early state and to prolong the functional fitness. In order to assure such an early detection, functional assessments must be conducted on a frequent and regular basis. Since the five time chair rise test (5CRT) is a well-established test in the geriatric field, this test should be supported by technology. We introduce an approach that automatically detects the execution of the chair rise test via an inertial sensor integrated into a belt. The system’s suitability was evaluated via 20 subjects aged 72–89 years (78.2 ± 4.6 years) and was measured by a stopwatch, the inertial measurement unit (IMU), a Kinect® camera and a force plate. A Multilayer Perceptrons-based classifier detects transitions in the IMU data with an F1-Score of around 94.8%. Valid executions of the 5CRT are detected based on the correct occurrence of sequential movements via a rule-based model. The results of the automatically calculated test durations are in good agreement with the stopwatch measurements (correlation coefficient r = 0.93 (p < 0.001)). The analysis of the duration of single test cycles indicates a beginning fatigue at the end of the test. The comparison of the movement pattern within one person shows similar movement patterns, which differ only slightly in form and duration, whereby different subjects indicate variations regarding their performance strategies.},
DOI = {10.3390/s19061370}
}
S. Hellmers, B. Izadpanah, L. Dasenbrock, R. Diekmann, J. M. Bauer, A. Hein, and S. Fudickar, "Towards an Automated Unsupervised Mobility Assessment for Older People Based on Inertial TUG Measurements" Sensors, vol. 18, iss. 10.
2018.
doi: 10.3390/s18103310
@article{AHellmers2018, abstract = {One of the most common assessments for the mobility of older people is the Timed Up and Go test (TUG). Due to its sensitivity regarding the indication of Parkinson's disease (PD) or increased fall risk in elderly people, this assessment test becomes increasingly relevant, should be automated and should become applicable for unsupervised self-assessments to enable regular examinations of the functional status. With Inertial Measurement Units (IMU) being well suited for automated analyses, we evaluate an IMU-based analysis-system, which automatically detects the TUG execution via machine learning and calculates the test duration. as well as the duration of its single components. The complete TUG was classified with an accuracy of 96% via a rule-based model in a study with 157 participants aged over 70 years. A comparison between the TUG durations determined by IMU and criterion standard measurements (stopwatch and automated/ambient TUG (aTUG) system) showed significant correlations of 0.97 and 0.99, respectively. The classification of the instrumented TUG (iTUG)-components achieved accuracies over 96%, as well. Additionally, the system's suitability for self-assessments was investigated within a semi-unsupervised situation where a similar movement sequence to the TUG was executed. This preliminary analysis confirmed that the self-selected speed correlates moderately with the speed in the test situation, but differed significantly from each other.},
author = {Hellmers, Sandra and Izadpanah, Babak and Dasenbrock, Lena and Diekmann, Rebecca and Bauer, J{\"{u}}rgen M and Hein, Andreas and Fudickar, Sebastian},
doi = {10.3390/s18103310},
file = {:home/s/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Hellmers et al. - 2018 - Towards an Automated Unsupervised Mobility Assessment for Older People Based on Inertial TUG Measurements.pdf:pdf},
issn = {1424-8220},
journal = {Sensors},
number = {10},
title = {{Towards an Automated Unsupervised Mobility Assessment for Older People Based on Inertial TUG Measurements}},
url = {http://www.mdpi.com/1424-8220/18/10/3310},
volume = {18},
year = {2018}
}
S. Hellmers, S. Fudickar, L. Dasenbrock, A. Heinks, J. M. Bauer, and A. Hein, "A Model-Based Approach for Jump Analyses Regarding Strength and Balance" in Proc. Biomedical Engineering Systems and Technologies, Cham, 2018.
doi: 10.1007/978-3-319-94806-5_19
@inproceedings{HellmersSandra2018, abstract = {To identify the functional decline as related to aging, geriatric assessments are an established instrument. Within such assessments, the functional ability is evaluated and consists of the three major components: strength, mobility, and balance. Counter movement jumps (CMJ) are well-suited to test these three essential elements of functional ability within a single assessment item. Since common balance measures have been shown to be significantly prone to algorithmic and technical variations, a robust alternative method is required. Thus, we introduce a model-based approach for balance and strength analyses, where the human lower extremities are modeled as an oscillating system during the phase of landing and recovery after a vertical jump. In the System and Control Technology, a transfer function of an oscillating system is described by a second-order delay element (PT2-element), which is characterized by the parameters natural frequency and damping. We analyze the jumps of 30 participants (70-87 years) regarding their jump phases and the mentioned parameters. A linear correlation between jump power and jump height, which are sensitive indicators of the muscle performance and the strength could be confirmed. While a correlation between jump power and spring constant could be observed, a significant relationship between the balance ability and natural frequency could not be identified.},
address = {Cham},
author = {Hellmers, Sandra and Fudickar, Sebastian and Dasenbrock, Lena and Heinks, Andrea and Bauer, J{\"{u}}rgen M. and Hein, Andreas},
booktitle = {Biomedical Engineering Systems and Technologies},
doi = {10.1007/978-3-319-94806-5_19},
editor = {{Peixoto Nathalia} and and Silveira, Margarida and {and Ali Hesham H.} and {and Maciel Carlos} and {and van den Broek Egon L}},
file = {:home/s/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Hellmers Sandra et al. - 2018 - A Model-Based Approach for Jump Analyses Regarding Strength and Balance.pdf:pdf},
isbn = {978-3-319-94806-5},
keywords = {UNIAMT,accepted,full paper},
pages = {354--375},
publisher = {Springer International Publishing},
title = {{A Model-Based Approach for Jump Analyses Regarding Strength and Balance}},
url = {http://doi.org/10.1007/978-3-319-94806-5_19},
year = {2018}
}
S. Hellmers, T. Kromke, L. Dasenbrock, A. Heinks, J. M. Bauer, A. Hein, and S. Fudickar, "Stair Climb Power Measurements via Inertial Measurement Units - Towards an Unsupervised Assessment of Strength in Domestic Environments" in Proc. Proceedings of the 11th International Joint Conference on Biomedical Engineering Systems and Technologies, 2018.
doi: 10.5220/0006543900390047
@inproceedings{HellmersHeinFudickar2018, abstract = {In order to initiate interventions at an early stage of functional decline and thus, to extend independent living, the early detection of changes in functional ability is important. The Stair Climb Power Test (SCPT) is a standard test in geriatric assessments for strength as one of the essential components of functional ability. This test is also well suited for regular and frequent power measurements in daily life since the activity of climbing stairs is usually frequently performed. We introduce an automated assessment of the SCPT based on inertial measurement units (IMU) in a study of 83 participants aged 70-87 years. For power evaluations of the lower extremities, the activity of climbing stairs was automatically classified via machine learning and the power was calculated based on the test duration and covered height. Climbing stairs was correctly classified in 93{\%} of the cases. We also achieved a good correlation of the power calculations with the conventional stop watch measurements with a mean deviation of 2.35{\%}. The system's sensitivity to detect the transition towards frailty has been confirmed. Furthermore, we discussed the general suitability of the automated stair climb power algorithm in unsupervised, standardized home-assessments.},
author = {{Hellmers, Sandra and Kromke, Tobias and Dasenbrock, Lena and Heinks, Andrea and Bauer, J{\"{u}}rgen M. and Hein, Andreas and Fudickar, Sebastian}},
booktitle = {Proceedings of the 11th International Joint Conference on Biomedical Engineering Systems and Technologies},
doi = {10.5220/0006543900390047},
isbn = {978-989-758-281-3},
keywords = {UNIAMT,accepted,full paper},
mendeley-tags = {UNIAMT,accepted,full paper},
pages = {39--47},
publisher = {SCITEPRESS - Science and Technology Publications},
title = {{Stair Climb Power Measurements via Inertial Measurement Units - Towards an Unsupervised Assessment of Strength in Domestic Environments}},
url = {http://www.scitepress.org/DigitalLibrary/Link.aspx?doi=10.5220/0006543900390047},
year = {2018}
}
S. Hellmers, S. Fudickar, C. Büse, L. Dasenbrock, A. Heinks, J. M. Bauer, and A. Hein, Technology Supported Geriatric AssessmentCham: Springer International Publishing.
2017.
doi: 10.1007/978-3-319-52322-4_6
@incollection{Hellmers2017c, abstract = {Healthy aging is a core societal aim especially regarding the demographic change. But with aging, functional decline can occur and this is a major challenge for health care systems. For the evaluation of the health of older adults and the identification of early changes associated with functional and cognitive decline, clinical geriatric assessments are a well-established approach. Ideally, the assessments should take place at home of the older adults or even in their daily life, to get an unbiased functional status. Therefore, we introduce a technology supported geriatric assessment as an intermediate step to a home-assessment or in future to sensor-based-assessments in daily life. Beside various ambient sensors, a sensor belt is used during the assessments and for 1 week in the participants' daily life. We discuss the suitability of our measuring devices for an ambient home-assessment and evaluate the sensors in comparison to valid measurements. Thereby, we show that light barrier measurements achieve a high sensitivity and a good correlation to manual measurements through study nurses or physical therapists.},
address = {Cham},
author = {Hellmers, Sandra and Fudickar, Sebastian and B{\"{u}}se, Clemens and Dasenbrock, Lena and Heinks, Andrea and Bauer, J{\"{u}}rgen M. and Hein, Andreas},
booktitle = {Ambient Assisted Living: 9. AAL-Kongress, Frankfurt/M, Germany, April 20 - 21, 2016},
doi = {10.1007/978-3-319-52322-4_6},
editor = {Wichert, Reiner and Mand, Beate},
file = {:C$\backslash$:/Users/NilsV/AppData/Local/Mendeley Ltd./Mendeley Desktop/Downloaded/Hellmers et al. - 2016 - Technology supported geriatric assessment.pdf:pdf},
isbn = {978-3-319-52322-4},
keywords = {UNIAMT,accepted,full paper},
mendeley-tags = {UNIAMT,accepted,full paper},
pages = {85--100},
publisher = {Springer International Publishing},
title = {{Technology Supported Geriatric Assessment}},
url = {http://dx.doi.org/10.1007/978-3-319-52322-4_6},
year = {2017}
}
S. Hellmers, S. Fudickar, E. Lange, C. Lins, and A. Hein, "Validation of a motion capture suit for clinical gait analysis" in Proc. Proceedings of the 11th EAI International Conference on Pervasive Computing Technologies for Healthcare - PervasiveHealth '17, New York, New York, USA, 2017.
doi: 10.1145/3154862.3154884
@inproceedings{Hellmers2017b, abstract = {Gait analysis is often supported by technology. Due to limitations in optical systems, such as limited measurement volumes and the requirement of a laboratory environment, low-cost inertial measurement unit (IMU) based motion capture system might be better suited for gait analysis since they involve no spatial limitations and are flexible applicable. In this paper we investigate, if a low-cost IMU-based motion capture suits are an adequate alternative for clinical gait analysis in terms of accuracy of the determination of joint flexions and gait parameters. For this reason, we developed a gait analysis system and a gait analysis algorithm, which detects joint positions based on the Joint Coordinate System and determines knee, hip, and ankle flexions, as well as spatiotemporal parameters such as the number of steps, cadence, step duration and step length, and the specific gait phases. We evaluated and validated the IMU-based system in comparison to camera-based measurements (as gold standard) with three different healthy adult subjects. The evaluation indicates that the full-body motion capture system achieves a high degree of precision (0.86) and recall (0.98) in the recognition of gait cycles. The harmonic mean F(0.15) of the two factors precision and recall is on average 0.96 and the mentioned temporal gait parameters can be determined with an error below 10 ms. The mean derivation in the determination of joint angles amounts 1.35+-2°. Consequently, the article at hand indicates that low-cost IMU-based motion capture suits are an accurate alternative for gait analysis.},
address = {New York, New York, USA},
author = {Hellmers, Sandra and Fudickar, Sebastian and Lange, Eugen and Lins, Christian and Hein, Andreas},
booktitle = {Proceedings of the 11th EAI International Conference on Pervasive Computing Technologies for Healthcare - PervasiveHealth '17},
doi = {10.1145/3154862.3154884},
file = {:C$\backslash$:/Users/NilsV/AppData/Local/Mendeley Ltd./Mendeley Desktop/Downloaded/Hellmers et al. - 2017 - Validation of a Motion Capture Suit for Clinical Gait Analysis.pdf:pdf},
isbn = {9781450363631},
keywords = {UNIAMT,accepted,full paper},
mendeley-tags = {UNIAMT,accepted,full paper},
pages = {120--126},
publisher = {ACM Press},
title = {{Validation of a motion capture suit for clinical gait analysis}},
url = {http://dl.acm.org/citation.cfm?doid=3154862.3154884},
year = {2017}
}
S. Hellmers, E. Steen, L. Dasenbrock, A. Heinks, J. M. Bauer, S. Fudickar, and A. Hein, "Towards a minimized unsupervised technical assessment of physical performance in domestic environments" in Proc. Proceedings of the 11th EAI International Conference on Pervasive Computing Technologies for Healthcare - PervasiveHealth '17, New York, New York, USA, 2017.
doi: 10.1145/3154862.3154882
@inproceedings{Hellmers2017a, abstract = {Early detection of changes in mobility associated with functional decline can increase the therapeutic success by prolonging self-determined living. To get an unbiased and high frequently status of the physical performance of the persons at risk, unsupervised assessments of their functional abilities should ideally take place in their homes.$\backslash$r$\backslash$nThus, we have developed a minimized unsupervised technical assessment of physical performance in domestic environments.$\backslash$r$\backslash$nBy conducting an exploratory factor analysis, based on the results of 79 study participants with a minimum age of 70 years, we could clarify that common assessment items mainly represent three key parameters of functional performance$\backslash$r$\backslash$nmobility and endurance, strength and balance. Consequently, we identified a minimal set of assessment items that is suitable for home-assessments and that, since covering all three parameters, is able to generate clinical meaningful and relevant insights about the functional status. Regarding the parameter mobility, we developed a technical assessment of physical performance for domestic environments, which utilizes short distance walk times assessed via ambient presence sensors as an indicator for potential functional decline. In a field trial over ten months with 20 participants with a mean age of 84.25 years, we could confirm the general feasibility of our approach and the proposed system.},
address = {New York, New York, USA},
author = {Hellmers, Sandra and Steen, Enno-Edzard and Dasenbrock, Lena and Heinks, Andrea and Bauer, J{\"{u}}rgen M. and Fudickar, Sebastian and Hein, Andreas},
booktitle = {Proceedings of the 11th EAI International Conference on Pervasive Computing Technologies for Healthcare - PervasiveHealth '17},
doi = {10.1145/3154862.3154882},
file = {:C$\backslash$:/Users/NilsV/AppData/Local/Mendeley Ltd./Mendeley Desktop/Downloaded/Hellmers et al. - 2017 - Towards a Minimized Unsupervised Technical Assessment of Physical Performance in Domestic Environments.pdf:pdf},
isbn = {9781450363631},
keywords = {UNIAMT,accepted,full paper},
mendeley-tags = {UNIAMT,accepted,full paper},
pages = {207--216},
publisher = {ACM Press},
title = {{Towards a minimized unsupervised technical assessment of physical performance in domestic environments}},
url = {http://dl.acm.org/citation.cfm?doid=3154862.3154882},
year = {2017}
}
S. Hellmers, S. Fudickar, L. Dasenbrock, A. Heinks, J. M. Bauer, and A. Hein, "Understanding Jump Landing as an Oscillating System: A Model-based Approach of Balance and Strength Analyses" in Proc. Proceedings of the 10th International Joint Conference on Biomedical Engineering Systems and Technologies, Porto, 2017.
doi: 10.5220/0006171101590168
@inproceedings{Hellmers2017, abstract = {Counter movement jumps (CMJ) are well-suited to measure the muscle power and balance. Since it has been clarified that well accepted CMJ amplification-based balance measures (such as TTS or CoP) are significantly influenced by algorithmic and measurement settings and thus, measurement results have limited meaningfulness among force platforms, we introduce a new model-based approach measuring the postural stability. In this, during the landing and recovery phases after vertical jumps, the lower extremities can be represented by an oscillating system and the corresponding transfer function is described by a second-order delay (PT2) element. In an initial prospective study with 20 subjects aged over 70 years, we observed an inverse relationship between the natural frequency and the jump height and could also identify an influence of sex, and body weight on the jump height. Furthermore, we also found a strong relation between natural frequency and dynamic postural stability index (DPSI), even though these results must be statistically ensured statistically using a larger cohort, due to the current limited number of subjects. Nevertheless, we could confirm the general applicability of the Systems and Control Technology perspective on describing human movements in a potentially more robust manner than current amplification based approaches.},
address = {Porto},
author = {Hellmers, Sandra and Fudickar, Sebastian and Dasenbrock, Lena and Heinks, Andrea and Bauer, J{\"{u}}rgen M. and Hein, Andreas},
booktitle = {Proceedings of the 10th International Joint Conference on Biomedical Engineering Systems and Technologies},
doi = {10.5220/0006171101590168},
file = {:C$\backslash$:/Users/NilsV/AppData/Local/Mendeley Ltd./Mendeley Desktop/Downloaded/Hellmers et al. - 2017 - Understanding the Jump Landing as an Oscillating System A Model-based Approach of Balance and Strength Analyzes.pdf:pdf},
isbn = {978-989-758-213-4},
keywords = {UNIAMT,accepted,full paper},
mendeley-tags = {UNIAMT,accepted,full paper},
pages = {159--168},
publisher = {SCITEPRESS - Science and Technology Publications},
title = {{Understanding Jump Landing as an Oscillating System: A Model-based Approach of Balance and Strength Analyses}},
url = {http://www.scitepress.org/DigitalLibrary/Link.aspx?doi=10.5220/0006171101590168},
year = {2017}
Cooperations / Funding
The project is funded by the Federal Ministry of Education and Research (02/18 -07/19)
Involved partners
Geriatrisches Zentrum am Agaplesion Bethanien Krankenhaus Heidelberg, Lehrstuhl für Geriatrie der Universität Heidelberg
Jade Hochschule Oldenburg, Abteilung Technik und Gesundheit für Menschen
OFFIS - Institut für Informatik, Bereich Gesundheit
As part of the second funding phase of AEQUIPA (Physical activity and health equity: primary prevention for healthy aging), the TUMAL (technology-supported motivation to maintain activity and quality of life) study is carried out in the Technology subproject.