Umeå universitets logga

umu.sePublikationer
Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Single sensor measurement of heel-height during the push-off phase of gait
Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper, Radiofysik.ORCID-id: 0000-0001-7431-8335
Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper, Radiofysik.ORCID-id: 0000-0003-1635-122x
Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper, Radiofysik.ORCID-id: 0000-0003-3363-7414
Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper, Radiofysik.ORCID-id: 0000-0002-3486-5251
2021 (Engelska)Ingår i: Physiological Measurement, ISSN 0967-3334, E-ISSN 1361-6579, Vol. 42, nr 10, artikel-id 105016Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Objective: In healthy gait a forceful push-off is needed to get an efficient leg swing and propulsion, and a high heel lift makes a forceful push-off possible. The power of the push-off is decreased with increased age and in persons with impaired balance and gait. The aim of this study was to evaluate whether a wearable equipment (Striton) and algorithms to estimate vertical heel-height during gait from a single optical distance sensor is reliable and feasible for clinical applications.

Approach: To assess heel-height with the Striton system an optical distance sensor was used to measure the distance to the floor along the shank. An algorithm was created to transform this measure to a vertical distance. The heel-height was validated in an experimental setup, against a 3D motion capture system (MCS), and test-retest and day-to-day tests were performed on 10 elderly persons. As a reference material 83 elderly persons were included, and heel-height was measured before and after surgery in four patients with the neurological disorder idiopathic normal pressure hydrocephalus (iNPH).

Main results: In the experimental setup the accuracy was high with a maximum error of 2% at all distances, target colours and inclination angles, and the correlation to the MCS was R = 0.94. Test-retest and day-to-day tests were equal within ±1.2 cm. Mean heel-height of the elderly persons was 16.5 ± 0.6 cm and in the patients with iNPH heel-height was increased from 11.2 cm at baseline to 15.3 cm after surgery.

Significance: Striton can reliably measure heel-height during gait, with low test-retest and day-to-day variability. The system was easy to attach, and simple to use, which makes it suitable for clinical applications.

Ort, förlag, år, upplaga, sidor
Institute of Physics (IOP), 2021. Vol. 42, nr 10, artikel-id 105016
Nyckelord [en]
heel-height, optical sensor, heel-height variability, push-off phase
Nationell ämneskategori
Medicinteknik
Forskningsämne
medicinsk informatik
Identifikatorer
URN: urn:nbn:se:umu:diva-182776DOI: 10.1088/1361-6579/ac325cISI: 000723408600001PubMedID: 34678800Scopus ID: 2-s2.0-85122532235OAI: oai:DiVA.org:umu-182776DiVA, id: diva2:1549065
Anmärkning

Previously included in thesis in manuscript form. 

Tillgänglig från: 2021-05-04 Skapad: 2021-05-04 Senast uppdaterad: 2024-05-13Bibliografiskt granskad
Ingår i avhandling
1. Wearable systems and sensors for the assessment of motor control: Development and validation of methods for clinical assessment of idiopathic normal pressure hydrocephalus
Öppna denna publikation i ny flik eller fönster >>Wearable systems and sensors for the assessment of motor control: Development and validation of methods for clinical assessment of idiopathic normal pressure hydrocephalus
2021 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Alternativ titel[sv]
Bärbara system och sensorer för bedömning av motorisk kontroll : Utveckling och validering av metoder för klinisk bedömning av idiopatisk normaltryckshydrocefalus
Abstract [en]

Human gait and balance are controlled by automatic processes in the central nervous system, and in sensory and proprioceptive systems. If a disturbance occurs in any of these complex structures, it may lead to balance and gait problems. Equally important are the systems controlling the upper extremity functions where reach, grasp and manipulation skills may be affected. For the neurodegenerative disease idiopathic normal pressure hydrocephalus (iNPH), balance and gait disturbances are cardinal symptoms. Motor control of the upper extremities is also affected. In clinic today, physical impairment of persons with iNPH is commonly visually assessed using subjective, course tests with ordinal scales with the risk of missing minor changes. There is a lack of objective and quantitative ways to measure motor control in daily patient care. The aim of this thesis was to develop and validate tools for objective assessment of parameters that affect motor control in persons with iNPH.

Postural stability in stance and walking was assessed using gyroscopes in patients with iNPH, healthy elderly (HE) and patients with ventriculomegaly (VM). Compared to HE, patients with iNPH had reduced postural stability and relied less on vision. iNPH patients also had a lower trunk sway velocity than VM during walking. The gyroscopic system could quantitatively assess postural deficits in iNPH, making it a potentially useful tool for diagnosis and for clinical follow-up. The differences found during gait also suggests that walking, rather than quiet stance, should be further investigated for facilitating differential diagnosis compared to other patient groups with ventriculomegaly.

The gait in patients with iNPH is according to guidelines defined as slow, shuffling with a low foot-lift, and wide based. To objectively quantify the latter two features, a system (Striton) was developed in-house to assess the increased distance between the feet and the peak heel-height at the push-off phase of the gait cycle. It was validated in experimental setups, compared to gold standard motion capture systems (MCS), on healthy elderly (HE), through test-retest and day-to-day evaluations, and in four patients with iNPH. Striton demonstrated high correlations, in step-width and in heel-height, compared with the MCS. The mean step-width in the HE was 5.2 ± 0.9 cm (mean±Standard Deviation) and the heel-height 16.7±0.6 cm. Test-retest and day-to-day variations were small, ±0.5 cm in step-width and ±1.2 cm in heel-height, and differences in the parameters were seen between HE and iNPH both before and after surgery. Thus, Striton has the potential of quantitatively assessing gait parameters in HE and iNPH in a valuable manner.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå Universitet, 2021. s. 50
Serie
Umeå University medical dissertations, ISSN 0346-6612 ; 2130
Nyckelord
Gait, step-width, heel-heigt, balance, trunk sway, idiopathic normal pressure hydrocephalus, IMU, Inter-rater reliability, kinematics
Nationell ämneskategori
Medicinteknik Neurologi
Forskningsämne
medicinsk informatik
Identifikatorer
urn:nbn:se:umu:diva-182784 (URN)978-91-7855-523-9 (ISBN)978-91-7855-524-6 (ISBN)
Disputation
2021-06-04, Betula, Norrlands Universitetssjukhus, Umeå, 09:00 (Svenska)
Opponent
Handledare
Anmärkning

Disputationen sänds även via Zoom.

Tillgänglig från: 2021-05-12 Skapad: 2021-05-04 Senast uppdaterad: 2021-12-06Bibliografiskt granskad

Open Access i DiVA

fulltext(1496 kB)182 nedladdningar
Filinformation
Filnamn FULLTEXT03.pdfFilstorlek 1496 kBChecksumma SHA-512
983dcde23139adf8a0223021710db9c0089426ecf6e542b62d0702e75fe4420853bfdc93a15e1e74045fca43a90a5eb79928ae321a2bc942fd40c087d9c1c9d6
Typ fulltextMimetyp application/pdf

Övriga länkar

Förlagets fulltextPubMedScopus

Person

Bäcklund, TomasGrip, HelenaÖhberg, FredrikSundström, Nina

Sök vidare i DiVA

Av författaren/redaktören
Bäcklund, TomasGrip, HelenaÖhberg, FredrikSundström, Nina
Av organisationen
Radiofysik
I samma tidskrift
Physiological Measurement
Medicinteknik

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 194 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

doi
pubmed
urn-nbn

Altmetricpoäng

doi
pubmed
urn-nbn
Totalt: 306 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf