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Dahlgren, G., Liv, P., Öhberg, F., Slunga-Järvholm, L., Forsman, M. & Rehn, B. (2023). Correlations between Ratings and Technical Measurements in Hand-Intensive Work. Bioengineering, 10(7), Article ID 867.
Open this publication in new window or tab >>Correlations between Ratings and Technical Measurements in Hand-Intensive Work
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2023 (English)In: Bioengineering, E-ISSN 2306-5354, Vol. 10, no 7, article id 867Article in journal (Refereed) Published
Abstract [en]

An accurate rating of hand activity and force is essential in risk assessment and for the effective prevention of work-related musculoskeletal disorders. However, it is unclear whether the subjective ratings of workers and observers correlate to corresponding objective technical measures of exposure. Fifty-nine workers were video recorded while performing a hand-intensive work task at their workplace. Self-ratings of hand activity level (HAL) and force (Borg CR10) using the Hand Activity Threshold Limit Value® were assessed. Four ergonomist observers, in two pairs, also rated the hand activity and force level for each worker from video recordings. Wrist angular velocity was measured using inertial movement units. Muscle activity in the forearm muscles flexor carpi radialis (FCR) and extensor carpi radialis (ECR) was measured with electromyography root mean square values (RMS) and normalized to maximal voluntary electrical activation (MVE). Kendall’s tau-b correlations were statistically significant between self-rated hand activity and wrist angular velocity at the 10th, 50th, and 90th percentiles (0.26, 0.31, and 0.23) and for the ratings of observers (0.32, 0.41, and 0.34). Significant correlations for force measures were found only for observer-ratings in five of eight measures (FCR 50th percentile 0.29, time > 10%MVE 0.43, time > 30%MVE 0.44, time < 5% −0.47) and ECR (time > 30%MVE 0.26). The higher magnitude of correlation for observer-ratings suggests that they may be preferred to the self-ratings of workers. When possible, objective technical measures of wrist angular velocity and muscle activity should be preferred to subjective ratings when assessing risks of work-related musculoskeletal disorders.

Place, publisher, year, edition, pages
MDPI, 2023
Keywords
electromyography, ergonomics, exposure, hand, hand intensity, humans, inertial measurement units, musculoskeletal disorders, occupational health, psychophysics, rating, risk, upper extremity, wrist
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:umu:diva-212749 (URN)10.3390/bioengineering10070867 (DOI)001034881300001 ()37508893 (PubMedID)2-s2.0-85166303077 (Scopus ID)
Funder
AFA Insurance, 210031Umeå University
Available from: 2023-08-11 Created: 2023-08-11 Last updated: 2023-08-11Bibliographically approved
Bengtsson, V., Berglund, L., Öhberg, F. & Aasa, U. (2023). Thoracolumbar and Lumbopelvic Spinal Alignment During the Barbell Back Squat: A Comparison Between Men and Women. International Journal of Sports Physical Therapy, 18(4), 820-830
Open this publication in new window or tab >>Thoracolumbar and Lumbopelvic Spinal Alignment During the Barbell Back Squat: A Comparison Between Men and Women
2023 (English)In: International Journal of Sports Physical Therapy, E-ISSN 2159-2896, Vol. 18, no 4, p. 820-830Article in journal (Refereed) Published
Abstract [en]

Background:  Maintaining neutral spinal alignment is considered important when performing the barbell back squat exercise. Since male and female lifters may differ in injury location it is important to examine whether they differ in spinal alignment during the back squat.

Objectives:  The study aimed to quantify the spinal alignment in the upper and lower lumbar spine during the barbell back squat exercise in male and female lifters. Secondary aims were to compare alignment during the back squat to standing habitual lumbar spine alignment and determine whether male and female lifters differ in these aspects.

Study design:  Observational, Cross-sectional.

Methods:  Competitive power- and weightlifters were recruited and performed three repetitions of the barbell back squat exercise using a load equivalent to 70% of their one-repetition maximum. Spinal alignment and range of motion were measured using inertial measurement units placed on the thoracic, lumbar and sacral spine. Data was presented descriptively and comparisons between men and women as well as spinal alignment in four different positions were done with a factorial repeated measures analysis of variance.

Results:  Twenty-three (14 males, 9 females) were included. During execution of the squat, spinal alignment adjustments in the lumbar spine were made in all three planes of movement, compared to the start position, in both male and female lifters. Compared to their standing habitual posture, all lifters adjusted their upper lumbar spine to a less lordotic position when in the start position of the back squat (standing upright with the barbell on their back). Only male lifters assumed a less lordotic alignment in their lower lumbar spine in the start position compared their habitual posture.

Conclusions:  Adjustments of spinal alignment, predominantly in the sagittal plane, are made during execution of the back squat in both male and female lifters. Further, lifters adopt a less lordotic alignment with a heavy barbell on their upper back, more so in male than female lifters. In conclusion, it seems that spinal alignment changes noticeably during the barbell back squat.

Level of evidence:  3

Place, publisher, year, edition, pages
International Journal of Sports Physical Therapy, 2023
Keywords
Inertial sensors, Lifting technique, Posture, Powerlifting, Weightlifting
National Category
Physiotherapy
Research subject
physiotherapy
Identifiers
urn:nbn:se:umu:diva-212693 (URN)10.26603/001c.83942 (DOI)37547841 (PubMedID)2-s2.0-85166774211 (Scopus ID)
Available from: 2023-08-08 Created: 2023-08-08 Last updated: 2023-08-15Bibliographically approved
Surano, S., Grip, H., Öhberg, F., Karlsson, M., Faergemann, E., Bjurman, M., . . . Salzer, J. (2022). Internet-based vestibular rehabilitation versus standard care after acute onset vertigo: a study protocol for a randomized controlled trial. Trials, 23(1), Article ID 496.
Open this publication in new window or tab >>Internet-based vestibular rehabilitation versus standard care after acute onset vertigo: a study protocol for a randomized controlled trial
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2022 (English)In: Trials, E-ISSN 1745-6215, Vol. 23, no 1, article id 496Article in journal (Refereed) Published
Abstract [en]

Background: Dizziness and vertigo affect around 15% of adults annually and represent common reasons for contacting health services, accounting for around 3% of all emergency department visits worldwide. Vertigo is also associated with excessive use of diagnostic imaging and emergency care and decreased productivity, primarily because of work absenteeism. Vestibular rehabilitation is an evidence-based treatment for chronic dizziness and supervised group exercise therapy has recently been shown to be effective after vestibular neuritis, a common cause of acute onset vertigo. However, such interventions are not readily available and there is a need for more easily accessible tools. The purpose of this study is to investigate the effects on vestibular symptoms of a 6-week online vestibular rehabilitation tool after acute onset vertigo, with the aim of aiding vestibular rehabilitation by presenting a more accessible tool that can help to reduce recovery time. Methods: Three hundred twenty individuals diagnosed with acute vestibular syndrome (AVS) will be recruited from multiple hospitals in Sweden and the effects of an online vestibular rehabilitation tool, YrselTräning, on vestibular symptoms after acute onset vertigo will be compared to standard care (written instructions leaflet) in a two-armed, evaluator-blinded, multicenter randomized controlled trial. The primary outcome will be the Vertigo Symptom Scale Short Form (VSS-SF) score at 6 weeks after symptom onset. Secondary outcomes include effects of the intervention on activities of daily living, mood and anxiety, vestibular function recovery, mobility measures, health economic effects, and the reliability of the Swedish VSS-SF translation. Discussion: Participants using the online vestibular rehabilitation tool are expected to recover earlier and to a greater extent from their symptoms as compared to standard care. Since up to 50% of people with AVS without treatment develop persistent symptoms, effective treatment of AVS will likely lead to a higher quality of life and help reduce the societal costs associated with dizziness and vertigo. Trial registration: Clinicaltrials.gov NCT05056324. Registered on September 24, 2021.

Place, publisher, year, edition, pages
Springer Nature, 2022
Keywords
Acute onset vertigo, AVS, Gait function, Internet-based rehabilitation, Multicenter, Online tool, Portable motion sensors, Randomized controlled trial, RCT, Vestibular rehabilitation
National Category
Otorhinolaryngology
Identifiers
urn:nbn:se:umu:diva-203605 (URN)10.1186/s13063-022-06460-0 (DOI)000812260200013 ()35710448 (PubMedID)2-s2.0-85132078781 (Scopus ID)
Available from: 2023-01-19 Created: 2023-01-19 Last updated: 2024-01-17Bibliographically approved
Mejtoft, T., Lindahl, O., Öhberg, F., Pommer, L., Jonzén, K., Andersson, B. M., . . . Hallberg, P. (2022). Medtech innovation guide: an empiric model to support medical technology innovation. Health and Technology, 12(5), 911-922
Open this publication in new window or tab >>Medtech innovation guide: an empiric model to support medical technology innovation
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2022 (English)In: Health and Technology, ISSN 2190-7188, E-ISSN 2190-7196, Vol. 12, no 5, p. 911-922Article in journal (Refereed) Published
Abstract [en]

Innovation has become increasingly important for most industries to cope with rapid technological changes as well as changing societal needs. Even though there are many sectors with specific needs when it comes to supporting innovation, the medical technology sector is facing several unique challenges that both increases the lead-time from idea to finished product and decreases the number of innovations that are developed. This paper presents a proposed innovation guide that has been developed and evaluated as a support for the innovation process within medical technology research. The guide takes the unique characteristics of the medical technology sector into account and serves as a usable guide for the innovator. The complete guide contains both a structure for the process and a usable web application to support the journey from idea to finished products and services. The paper also includes a new readiness level, Sect. 4.2 to provide support both when developing and determining the readiness for clinical implementation of a medical technology innovation.

Place, publisher, year, edition, pages
Springer, 2022
Keywords
Biomedical engineering, Innovation, Medical technology, Medtech innovation guide
National Category
Medical Laboratory and Measurements Technologies
Identifiers
urn:nbn:se:umu:diva-199115 (URN)10.1007/s12553-022-00689-0 (DOI)000842927600002 ()2-s2.0-85136569769 (Scopus ID)
Funder
Umeå UniversitySwedish Agency for Economic and Regional GrowthEuropean Regional Development Fund (ERDF)
Available from: 2022-10-05 Created: 2022-10-05 Last updated: 2022-10-05Bibliographically approved
Dahlgren, G., Liv, P., Öhberg, F., Slunga-Järvholm, L., Forsman, M. & Rehn, B. (2022). Ratings of hand activity and force levels among women and men who perform identical hand-intensive work tasks. International Journal of Environmental Research and Public Health, 19(24), Article ID 16706.
Open this publication in new window or tab >>Ratings of hand activity and force levels among women and men who perform identical hand-intensive work tasks
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2022 (English)In: International Journal of Environmental Research and Public Health, ISSN 1661-7827, E-ISSN 1660-4601, Vol. 19, no 24, article id 16706Article in journal (Refereed) Published
Abstract [en]

We compared hand activity and force ratings in women and men doing identical hand-intensive work tasks. Musculoskeletal disorders are more common in women and hand-intensive work leads to an increased risk of these disorders. Knowledge of the gender influence in the rating of work exposure is lacking. The aim of this study was to investigate whether women and men performing identical hand-intensive work tasks were equally rated using hand activity and normalized peak force levels with the Hand Activity Threshold Limit Value®. Fifty-six workers participated, comprising 28 women-men pairs. Four observers-two woman-man pairs-were also involved. Self-ratings and observers' ratings of hand activity and force level were collected. The results of these ratings showed no significant gender differences in self-rated hand activity and force, as well as observer-rated hand activity. However, there was a significant gender difference in the observer-rated force, where the women were rated higher (mean (SD): women 3.9 (2.7), men 3.1 (1.8) (p = 0.01)). This difference remained significant in the adjusted model (p = 0.04) with grip strength and forearm-finger anthropometrics. The results provide new insights that observers' estimates of force can be higher in women compared with men in the same work tasks. Force should be further investigated and preferably compared to objective measurements.

Place, publisher, year, edition, pages
MDPI, 2022
Keywords
cumulative trauma disorders, equity, ergonomic assessment, exposure assessment, gender differences, observation, psychophysics, repetitive strain injury, upper extremity, workload
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:umu:diva-202061 (URN)10.3390/ijerph192416706 (DOI)000901096400001 ()36554587 (PubMedID)2-s2.0-85144537782 (Scopus ID)
Funder
AFA Insurance, 210031Umeå UniversityRegion Västerbotten
Available from: 2023-01-03 Created: 2023-01-03 Last updated: 2023-09-05Bibliographically approved
Bengtsson, V., Aasa, U., Öhberg, F. & Berglund, L. (2022). Thoracolumbar and lumbopelvic spinal alignment during the deadlift exercise: a comparison between men and women. International Journal of Sports Physical Therapy, 17(6), 1063-1074
Open this publication in new window or tab >>Thoracolumbar and lumbopelvic spinal alignment during the deadlift exercise: a comparison between men and women
2022 (English)In: International Journal of Sports Physical Therapy, E-ISSN 2159-2896, Vol. 17, no 6, p. 1063-1074Article in journal (Refereed) Published
Abstract [en]

Background: A neutral spinal alignment is considered important during the execution of the deadlift exercise to decrease the risk of injury. Since male and female powerlifters experience pain in different parts of their backs, it is important to examine whether men and women differ in spinal alignment during the deadlift.

Objectives: The purpose of this study was to quantify the spinal alignment in the upper (thoracolumbar, T11-L2) and lower (lumbopelvic, L2-S2) lumbar spine during the deadlift exercise in male and female lifters. Secondary aims were to compare lumbar spine alignment during the deadlift to standing habitual posture, and determine whether male and female lifters differ in these aspects.

Study Design: Observational, Cross-sectional.

Methods: Twenty-four (14 men, 10 women) lifters performed three repetitions of the deadlift exercise using 70% of their respective one-repetition maximum. Spinal alignment and spinal range of motion were measured using three inertial measurement units placed on the thoracic, lumbar and sacral spine. Data from three different positions were analyzed; habitual posture in standing, and start and stop positions of the deadlift, i.e. bottom and finish position respectively.

Results: During the deadlift, spinal adjustments were evident in all three planes of movement. From standing habitual posture to the start position the lumbar lordosis decreased 13° in the upper and 20° in the lower lumbar spine. From start position to stop position the total range of motion in the sagittal plane was 11° in the upper and 22° in the lower lumbar spine. The decreased lumbar lordosis from standing habitual posture to the start position was significantly greater among men.

Conclusions: Men and women adjust their spinal alignment in all three planes of movement when performing a deadlift and men seem to make greater adjustments from their standing habitual posture to start position in the sagittal plane. Level of Evidence 3.

Place, publisher, year, edition, pages
North American Sports Medicine Institute, 2022
Keywords
inertial sensors, lifting technique, posture, powerlifting
National Category
Physiotherapy Orthopaedics
Research subject
physiotherapy
Identifiers
urn:nbn:se:umu:diva-200377 (URN)10.26603/001c.37859 (DOI)36237649 (PubMedID)2-s2.0-85139461910 (Scopus ID)
Available from: 2022-11-08 Created: 2022-11-08 Last updated: 2023-05-04Bibliographically approved
Grip, H., Källströmer, A. & Öhberg, F. (2022). Validity and reliability of wearable motion sensors for clinical assessment of shoulder function in brachial plexus birth injury. Sensors, 22(23), Article ID 9557.
Open this publication in new window or tab >>Validity and reliability of wearable motion sensors for clinical assessment of shoulder function in brachial plexus birth injury
2022 (English)In: Sensors, E-ISSN 1424-8220, Vol. 22, no 23, article id 9557Article in journal (Refereed) Published
Abstract [en]

The modified Mallet scale (MMS) is commonly used to grade shoulder function in brachial plexus birth injury (BPBI) but has limited sensitivity and cannot grade scapulothoracic and glenohumeral mobility. This study aims to evaluate if the addition of a wearable inertial movement unit (IMU) system could improve clinical assessment based on MMS. The system validity was analyzed with simultaneous measurements with the IMU system and an optical camera system in three asymptomatic individuals. Test–retest and interrater reliability were analyzed in nine asymptomatic individuals and six BPBI patients. IMUs were placed on the upper arm, forearm, scapula, and thorax. Peak angles, range of motion, and average joint angular speed in the shoulder, scapulothoracic, glenohumeral, and elbow joints were analyzed during mobility assessments and MMS tasks. In the validity tests, clusters of reflective markers were placed on the sensors. The validity was high with an error standard deviation below 3.6°. Intraclass correlation coefficients showed that 90.3% of the 69 outcome scores showed good-to-excellent test–retest reliability, and 41% of the scores gave significant differences between BPBI patients and controls with good-to-excellent test–retest reliability. The interrater reliability was moderate to excellent, implying that standardization is important if the patient is followed-up longitudinally.

Place, publisher, year, edition, pages
MDPI, 2022
Keywords
brachial plexus birth injury, clinical evaluation, inertial movement unit, kinematic analysis, scapula movement, shoulder function
National Category
Neurology
Identifiers
urn:nbn:se:umu:diva-203334 (URN)10.3390/s22239557 (DOI)000896308800001 ()36502259 (PubMedID)2-s2.0-85143776750 (Scopus ID)
Funder
Vinnova, 2019-01379Region Västerbotten, RV-970088
Available from: 2023-01-17 Created: 2023-01-17 Last updated: 2023-05-09Bibliographically approved
Aasa, U., Bengtsson, V., Berglund, L. & Öhberg, F. (2022). Variability of lumbar spinal alignment among power- and weightlifters during the deadlift and barbell back squat. Sports Biomechanics, 21(6), 707-717
Open this publication in new window or tab >>Variability of lumbar spinal alignment among power- and weightlifters during the deadlift and barbell back squat
2022 (English)In: Sports Biomechanics, ISSN 1476-3141, E-ISSN 1752-6116, Vol. 21, no 6, p. 707-717Article in journal (Refereed) Published
Abstract [en]

The aims of the study were to evaluate the relative and absolute variability of upper (T11-L2) and lower (L2-S2) lumbar spinal alignment in power- and weightlifters during the deadlift and back squat exercises, and to compare this alignment between the two lifting groups. Twenty-four competitive powerlifters (n = 14) and weightlifters (n = 10) performed three repetitions of the deadlift and the back squat exercises using a load equivalent to 70% of their respective one-repetition maximum. The main outcome measures were the three-dimensional lumbar spinal alignment for start position, minimum and maximum angle of their spinal alignment, and range of motion measured using inertial measurement units. Relative intra-trial reliability was calculated using the two-way random model intraclass correlation coefficient (ICC) and absolute reliability with minimal detectable change (MDC). The ICC ranged between 0.69 and 0.99 and the MDC between 1 degrees-8 degrees for the deadlift. Corresponding figures for the squat were 0.78-0.99 and 1 degrees-6 degrees. In all participants during both exercises, spinal adjustments were made in both thoracolumbar and lumbopelvic areas in all three dimensions. In conclusion, when performing three repetitions of the deadlift and the squat, lumbar spinal alignment of the lifters did not change much between repetitions and did not differ significantly between power- and weightlifters.

Place, publisher, year, edition, pages
Routledge, 2022
Keywords
Inertial sensors, powerlifting, weightlifting, lifting technique
National Category
Physiotherapy
Identifiers
urn:nbn:se:umu:diva-165734 (URN)10.1080/14763141.2019.1675751 (DOI)000496089200001 ()31718474 (PubMedID)2-s2.0-85075026469 (Scopus ID)
Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2022-08-04Bibliographically approved
Öhberg, F., Vänn, M., Jonzén, K., Edström, U. & Sundström, N. (2021). Comparison between two mobile applications measuring shoulder elevation angle–A validity and feasibility study. Medical Engineering and Physics, 98, 1-7
Open this publication in new window or tab >>Comparison between two mobile applications measuring shoulder elevation angle–A validity and feasibility study
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2021 (English)In: Medical Engineering and Physics, ISSN 1350-4533, E-ISSN 1873-4030, Vol. 98, p. 1-7Article in journal (Refereed) Published
Abstract [en]

Pain in the shoulder complex affects the working population where work with elevated arms is a risk factor. The aim of the present study was to compare a mobile application for measurements of arm elevation, ErgoExposure, against an existing mobile application, ErgoArmMeter, in a laboratory setting and to test the feasibility in a field trial. Eleven persons performed three tasks in the laboratory setting: static, dynamic, and simulated work tasks, where the applications were validated against an optical tracking system (OTS). Also, ErgoExposure was tested by a teacher in a real-world situation. Limits of agreement for the static task varied between -6.1° to 4.2° (ErgoExposure) and between -7.6° to 5.2° (ErgoArmMeter). The average root mean square difference for dynamic and simulated work tasks was 3.4° (ErgoExposure) and 7.7° (ErgoArmMeter). From the field trial, different work tasks produced distinct exposure variation analysis patterns. Both apps showed similar results compared to OTS, but ErgoExposure was more accurate than ErgoArmMeter.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
Biomechanics, Ergonomics, Mobile phone
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:umu:diva-188862 (URN)10.1016/j.medengphy.2021.10.005 (DOI)000712268000001 ()34848028 (PubMedID)2-s2.0-85117245488 (Scopus ID)
Available from: 2021-11-02 Created: 2021-11-02 Last updated: 2023-03-24Bibliographically approved
Månsson, L., Bäckman, P., Öhberg, F., Sandlund, J., Selling, J. & Sandlund, M. (2021). Evaluation of Concurrent Validity between a Smartphone Self-Test Application and Clinical Tests for Balance and Leg Strength. Sensors, 21(5), Article ID 1765.
Open this publication in new window or tab >>Evaluation of Concurrent Validity between a Smartphone Self-Test Application and Clinical Tests for Balance and Leg Strength
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2021 (English)In: Sensors, E-ISSN 1424-8220, Vol. 21, no 5, article id 1765Article in journal (Refereed) Published
Abstract [en]

The evolving use of sensors to objectively assess movements is a potentially valuable addition to clinical assessments. We have developed a new self-test application prototype, MyBalance, in the context of fall prevention aimed for use by older adults in order to independently assess balance and functional leg strength. The objective of this study was to investigate the new self-test application for concurrent validity between clinical instruments and variables collected with a smartphone. The prototype has two test procedures: static standing balance test in two positions, and leg strength test performed as a sit-to-stand test. Thirty-one older adults were assessed for balance and functional leg strength, in an outpatient physiotherapy setting, using seven different clinical assessments and three sensor-tests. The results show that clinical instruments and sensor measurements correlate to a higher degree for the smartphone leg strength test. For balance tests, only a few moderate correlations were seen in the Feet Together position and no significant correlations for the Semi Tandem Stance. This study served as a first step to develop a smartphone self-test application for older adults to assess functional balance at home. Further research is needed to test validity, reliability, and user-experience of this new self-test application.

Place, publisher, year, edition, pages
MDPI, 2021
Keywords
aged, smartphone, mHealth, postural balance, muscle strength, mobile applications, validity, patient outcome assessment
National Category
Physiotherapy Medical Laboratory and Measurements Technologies
Research subject
physiotherapy
Identifiers
urn:nbn:se:umu:diva-178375 (URN)10.3390/s21051765 (DOI)000628534900001 ()2-s2.0-85101925586 (Scopus ID)
Funder
Swedish Research Council, 2015-03481
Available from: 2021-01-11 Created: 2021-01-11 Last updated: 2023-09-05Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-3363-7414

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