{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,4]],"date-time":"2026-02-04T17:24:57Z","timestamp":1770225897118,"version":"3.49.0"},"reference-count":43,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2020,5,15]],"date-time":"2020-05-15T00:00:00Z","timestamp":1589500800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002347","name":"Bundesministerium f\u00fcr Bildung und Forschung","doi-asserted-by":"publisher","award":["01EL1822D"],"award-info":[{"award-number":["01EL1822D"]}],"id":[{"id":"10.13039\/501100002347","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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 \u201cUp &amp; Go\u201d (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\u2019s test performance. Sensor datasets of the USS\u2019s 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\u2019s 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.<\/jats:p>","DOI":"10.3390\/s20102824","type":"journal-article","created":{"date-parts":[[2020,5,15]],"date-time":"2020-05-15T10:53:59Z","timestamp":1589540039000},"page":"2824","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Measurement System for Unsupervised Standardized Assessment of Timed \u201cUp &amp; Go\u201d and Five Times Sit to Stand Test in the Community\u2014A Validity Study"],"prefix":"10.3390","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3553-5131","authenticated-orcid":false,"given":"Sebastian","family":"Fudickar","sequence":"first","affiliation":[{"name":"Assistance Systems and Medical Device Technology, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1686-6752","authenticated-orcid":false,"given":"Sandra","family":"Hellmers","sequence":"additional","affiliation":[{"name":"Assistance Systems and Medical Device Technology, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany"}]},{"given":"Sandra","family":"Lau","sequence":"additional","affiliation":[{"name":"Center for Geriatric Medicine, Agaplesion Bethanien Krankenhaus Heidelberg, University Heidelberg, 69117 Heidelberg, Germany"}]},{"given":"Rebecca","family":"Diekmann","sequence":"additional","affiliation":[{"name":"Assistance Systems and Medical Device Technology, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany"}]},{"given":"J\u00fcrgen M.","family":"Bauer","sequence":"additional","affiliation":[{"name":"Center for Geriatric Medicine, Agaplesion Bethanien Krankenhaus Heidelberg, University Heidelberg, 69117 Heidelberg, Germany"}]},{"given":"Andreas","family":"Hein","sequence":"additional","affiliation":[{"name":"Assistance Systems and Medical Device Technology, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany"}]}],"member":"1968","published-online":{"date-parts":[[2020,5,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1376","DOI":"10.1093\/gerona\/glr158","article-title":"Muscle Strength and BMI as Predictors of Major Mobility Disability in the Lifestyle Interventions and Independence for Elders Pilot (LIFE-P)","volume":"66A","author":"Marsh","year":"2011","journal-title":"J. Gerontol. Ser. A Biol. Sci. Med. Sci."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"66","DOI":"10.1093\/gerona\/glr055","article-title":"Absolute Strength and Loss of Strength as Predictors of Mobility Decline in Older Adults: The InCHIANTI Study","volume":"67A","author":"Hicks","year":"2011","journal-title":"J. Gerontol. Ser. A Biol. Sci. Med. Sci."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Vermeulen, J., Neyens, J.C., van Rossum, E., Spreeuwenberg, M.D., and de Witte, L.P. (2011). Predicting ADL disability in community-dwelling elderly people using physical frailty indicators: A systematic review. BMC Geriatr., 11.","DOI":"10.1186\/1471-2318-11-33"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"485","DOI":"10.1111\/j.1532-5415.2011.03867.x","article-title":"All-Cause 1-, 5-, and 10-Year Mortality in Elderly People According to Activities of Daily Living Stage","volume":"60","author":"Stineman","year":"2012","journal-title":"J. Am. Geriatr. Soc."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"905","DOI":"10.1093\/gerona\/gls005","article-title":"Physical Activity at Age of 20\u201364 Years and Mobility and Muscle Strength in Old Age: A Community-Based Study","volume":"67","author":"Tikkanen","year":"2012","journal-title":"J. Gerontol. Ser. A Biol. Sci. Med. Sci."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"175","DOI":"10.1097\/NNR.0b013e318199b53a","article-title":"Meta-analysis of Quality-of-Life Outcomes From Physical Activity Interventions","volume":"58","author":"Conn","year":"2009","journal-title":"Nurs. Res."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Angevaren, M., Aufdemkampe, G., Verhaar, H., Aleman, A., and Vanhees, L. (2008). Physical activity and enhanced fitness to improve cognitive function in older people without known cognitive impairment. Cochrane Database Syst. Rev.","DOI":"10.1002\/14651858.CD005381.pub3"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1510","DOI":"10.1249\/MSS.0b013e3181a0c95c","article-title":"Exercise and Physical Activity for Older Adults","volume":"41","author":"Proctor","year":"2009","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_9","first-page":"78","article-title":"The Effects of a Home-Based Exercise Program on Physical Function in Frail Older Adults","volume":"33","author":"Matsuda","year":"2010","journal-title":"J. Geriatr. Phys. Ther."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"239","DOI":"10.1093\/fampra\/cmp101","article-title":"Effectiveness of a geriatric intervention in primary care: A randomized clinical trial","volume":"27","author":"Monteserin","year":"2010","journal-title":"Fam. Pract."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"323","DOI":"10.2147\/CIA.S54644","article-title":"Adherence of older women with strength training and aerobic exercise","volume":"9","author":"Picorelli","year":"2014","journal-title":"Clin. Interv. Aging"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1032","DOI":"10.1016\/0140-6736(93)92884-V","article-title":"Comprehensive geriatric assessment: A meta-analysis of controlled trials","volume":"342","author":"Stuck","year":"1993","journal-title":"Lancet"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1022","DOI":"10.1001\/jama.287.8.1022","article-title":"Home Visits to Prevent Nursing Home Admission and Functional Decline in Elderly People","volume":"287","author":"Stuck","year":"2002","journal-title":"JAMA"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"387","DOI":"10.1007\/BF03324941","article-title":"Mobility, functional ability and health-related quality of life among people of 60 years or older","volume":"22","author":"Borglin","year":"2010","journal-title":"Aging Clin. Exp. Res."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"727","DOI":"10.1093\/gerona\/glq029","article-title":"The Impact of Functional Status on Life Expectancy in Older Persons","volume":"65A","author":"Keeler","year":"2010","journal-title":"J. Gerontol. Ser. A Biol. Sci. Med. Sci."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"142","DOI":"10.1111\/j.1532-5415.1991.tb01616.x","article-title":"The Timed \u201cUp & Go\u201d: A Test of Basic Functional Mobility for Frail Elderly Persons","volume":"39","author":"Podsiadlo","year":"1991","journal-title":"J. Am. Geriatr. Soc."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Hellmers, S., Fudickar, S., Lau, S., Elgert, L., Diekmann, R., Bauer, J.M., and Hein, A. (2019). Measurement of the Chair Rise Performance of Older People Based on Force Plates and IMUs. Sensors, 19.","DOI":"10.3390\/s19061370"},{"key":"ref_18","first-page":"417","article-title":"Predictive Cutoff Values of the Five-Times Sit-to-Stand Test and the Timed \u201cUp & Go\u201d Test for Disability Incidence in Older People Dwelling in the Community","volume":"97","author":"Makizako","year":"2017","journal-title":"Phys. Ther."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1575","DOI":"10.1111\/j.1532-5415.2008.01777.x","article-title":"Five Times Sit To Stand Test is a Predictor of Recurrent Falls in Healthy community-living Subjects Aged 65 and Older","volume":"56","author":"Buatois","year":"2008","journal-title":"J. Am. Geriatr. Soc."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"664","DOI":"10.1046\/j.1532-5415.2001.49115.x","article-title":"Guideline for the Prevention of Falls in Older Persons","volume":"49","author":"Society","year":"2001","journal-title":"J. Am. Geriatr. Soc."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Hellmers, S., Kromke, T., Dasenbrock, L., Heinks, A., Bauer, J.M., Hein, A., and Fudickar, S. (2018, January 19\u201321). Stair Climb Power Measurements via Inertial Measurement Units\u2014Towards an Unsupervised Assessment of Strength in Domestic Environments. Proceedings of the 11th International Joint Conference on Biomedical Engineering Systems and Technologies, Funchal, Madeira, Portugal.","DOI":"10.5220\/0006543900390047"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Hellmers, S., Steen, E.E., Dasenbrock, L., Heinks, A., Bauer, J.M., Fudickar, S., and Hein, A. (2017, January 23\u201326). Towards a minimized unsupervised technical assessment of physical performance in domestic environments. Proceedings of the 11th EAI International Conference on Pervasive Computing Technologies for Healthcare\u2014PervasiveHealth \u201917, Barcelona, Spain.","DOI":"10.1145\/3154862.3154882"},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Fudickar, S., Stolle, C., Volkening, N., and Hein, A. (2018). Scanning Laser Rangefinders for the Unobtrusive Monitoring of Gait Parameters in Unsupervised Settings. Sensors, 18.","DOI":"10.3390\/s18103424"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1080\/10400435.2018.1446195","article-title":"Validation of the ambient TUG chair with light barriers and force sensors in a clinical trial","volume":"32","author":"Fudickar","year":"2017","journal-title":"Assist. Technol."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"94","DOI":"10.1002\/pri.394","article-title":"Reliability and concurrent validity of the Expanded Timed Up-and-Go test in older people with impaired mobility","volume":"13","author":"Botolfsen","year":"2008","journal-title":"Physiother. Res. Int."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"2605","DOI":"10.1111\/jgs.16135","article-title":"Validation of a Multi\u2014Sensor-Based Kiosk for Short Physical Performance Battery","volume":"67","author":"Jung","year":"2019","journal-title":"J. Am. Geriatr. Soc."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Hellmers, S., Izadpanah, B., Dasenbrock, L., Diekmann, R., Bauer, J.M., Hein, A., and Fudickar, S. (2018). Towards an Automated Unsupervised Mobility Assessment for Older People Based on Inertial TUG Measurements. Sensors, 18.","DOI":"10.3390\/s18103310"},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Wichert, R., and Mand, B. (2017). Technology Supported Geriatric Assessment. Ambient Assisted Living: 9. AAL-Kongress, Frankfurt\/M, Germany, 20\u201321 April 2016, Springer International Publishing.","DOI":"10.1007\/978-3-319-26345-8"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"645","DOI":"10.1007\/s00779-010-0293-9","article-title":"Preprocessing techniques for context recognition from accelerometer data","volume":"14","author":"Figo","year":"2010","journal-title":"Pers. Ubiquitous Comput."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"767","DOI":"10.1093\/ptj\/pzx039","article-title":"Reliability, Validity, and Minimal Detectable Change of Four-Step Stair Climb Power Test in Community-Dwelling Older Adults","volume":"97","author":"Ni","year":"2017","journal-title":"Phys. Ther."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"556","DOI":"10.1056\/NEJM199503023320902","article-title":"Lower-Extremity Function in Persons over the Age of 70 Years as a Predictor of Subsequent Disability","volume":"332","author":"Guralnik","year":"1995","journal-title":"N. Engl. J. Med."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"363","DOI":"10.1123\/japa.6.4.363","article-title":"The Reliability and Validity of a 6-Minute Walk Test as a Measure of Physical Endurance in Older Adults","volume":"6","author":"Rikli","year":"1998","journal-title":"J. Aging Phys. Act."},{"key":"ref_33","first-page":"69","article-title":"A guide to appropriate use of correlation coefficient in medical research","volume":"24","author":"Mukaka","year":"2012","journal-title":"Malawi Med. J."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"599","DOI":"10.1682\/JRRD.2015.04.0065","article-title":"Reliability and validity of the inertial sensor-based Timed \u201cUp and Go\u201d test in individuals affected by stroke","volume":"53","author":"Wueest","year":"2016","journal-title":"J. Rehabil. Res. Dev."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"8705","DOI":"10.3390\/s140508705","article-title":"Test-Retest Reliability of a Pendant-Worn Sensor Device in Measuring Chair Rise Performance in Older Persons","volume":"14","author":"Zhang","year":"2014","journal-title":"Sensors"},{"key":"ref_36","unstructured":"Janeway, T.C. (1904). The Clinical Study of Blood Pressure\u2014A Guide to the Use of the Sphygmomanometer, Appleton."},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Kalbe, E., and Kessler, J. (2017). DemTect. Cognitive Screening Instruments: A Practical Approach, Springer International Publishing.","DOI":"10.1007\/978-3-319-44775-9_8"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"M221","DOI":"10.1093\/gerona\/55.4.M221","article-title":"Lower extremity function and subsequent disability: Consistency across studies, predictive models, and value of gait speed alone compared with the short physical performance battery","volume":"55","author":"Guralnik","year":"2000","journal-title":"J. Gerontol. Ser. A Biol. Sci. Med. Sci."},{"key":"ref_39","doi-asserted-by":"crossref","unstructured":"Alghadir, A., Anwer, S., and Brism\u00e9e, J.M. (2015). The reliability and minimal detectable change of Timed Up and Go test in individuals with grade 1\u20133 knee osteoarthritis. BMC Musculoskelet. Disord., 16.","DOI":"10.1186\/s12891-015-0637-8"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"380","DOI":"10.1227\/NEU.0000000000001320","article-title":"Assessment of the minimum clinically important difference in the timed up and go test after surgery for lumbar degenerative disc disease","volume":"80","author":"Gautschi","year":"2017","journal-title":"Neurosurgery"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"339","DOI":"10.1007\/BF03325265","article-title":"The five-times-sit-to-stand test: Validity, reliability and detectable change in older females","volume":"24","author":"Goldberg","year":"2012","journal-title":"Aging Clin. Exp. Res."},{"key":"ref_42","first-page":"58","article-title":"Reliability, Validity and Minimal Detectable Change in the Timed Up and Go and Five Times Sit-to-Stand Tests in Older Adults with Early Cognitive Loss","volume":"5","author":"Blackwood","year":"2017","journal-title":"J. Physiother. Rehabil."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"2127","DOI":"10.1111\/j.1532-5415.2012.04209.x","article-title":"Gait and Cognition: A Complementary Approach to Understanding Brain Function and the Risk of Falling","volume":"60","author":"Verghese","year":"2012","journal-title":"J. Am. Geriatr. Soc."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/20\/10\/2824\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T09:29:20Z","timestamp":1760174960000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/20\/10\/2824"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,5,15]]},"references-count":43,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2020,5]]}},"alternative-id":["s20102824"],"URL":"https:\/\/doi.org\/10.3390\/s20102824","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,5,15]]}}}