du.sePublications
Change search
Link to record
Permanent link

Direct link
BETA
Alternative names
Publications (10 of 16) Show all publications
Bergman, S., Ann, B., Anna-Carin, B. & Brorsson, S. (2015). Chronic widespread pain in adolescents is highly associated to stress and anxiety. In: Meeting abstracts: 2015 ACR/ARHP Annual Meeting. Paper presented at ACR/ARHP Annual Meeting, San Fransisco, 6-11 November, 2015.
Open this publication in new window or tab >>Chronic widespread pain in adolescents is highly associated to stress and anxiety
2015 (English)In: Meeting abstracts: 2015 ACR/ARHP Annual Meeting, 2015Conference paper, Oral presentation with published abstract (Refereed)
National Category
Health Sciences
Research subject
Health and Welfare
Identifiers
urn:nbn:se:du-19868 (URN)
Conference
ACR/ARHP Annual Meeting, San Fransisco, 6-11 November, 2015
Available from: 2015-11-03 Created: 2015-11-03 Last updated: 2016-04-11Bibliographically approved
Brorsson, S., Nilsdotter, A., Thorstensson, C. & Bremander, A. (2014). Differences in muscle activity during hand dexterity tasks between women with arthritis and a healthy reference group. BMC Musculoskeletal Disorders, 15, Article ID 154.
Open this publication in new window or tab >>Differences in muscle activity during hand dexterity tasks between women with arthritis and a healthy reference group
2014 (English)In: BMC Musculoskeletal Disorders, ISSN 1471-2474, E-ISSN 1471-2474, Vol. 15, article id 154Article in journal (Refereed) Published
Abstract [en]

Background. Impaired hand function is common in patients with arthritis and it affects performance of daily activities; thus, hand exercises are recommended. There is little information on the extent to which the disease affects activation of the flexor and extensor muscles during these hand-dexterity tasks. The purpose of this study was to compare muscle activation during such tasks in subjects with arthritis and in a healthy reference group.

Methods. Muscle activation was measured in m. extensor digitorium communis (EDC) and in m. flexor carpi radialis (FCR) with surface electromyography (EMG) in women with rheumatoid arthritis (RA, n = 20), hand osteoarthritis (HOA, n = 16) and in a healthy reference group (n = 20) during the performance of four daily activity tasks and four hand exercises. Maximal voluntary isometric contraction (MVIC) was measured to enable intermuscular comparisons, and muscle activation is presented as %MVIC.

Results. The arthritis group used a higher %MVIC than the reference group in both FCR and EDC when cutting with a pair of scissors, pulling up a zipper and—for the EDC—also when writing with a pen and using a key (p < 0.02). The exercise “rolling dough with flat hands” required the lowest %MVIC and may be less effective in improving muscle strength.

Conclusions. Women with arthritis tend to use higher levels of muscle activation in daily tasks than healthy women, and wrist extensors and flexors appear to be equally affected. It is important that hand training programs reflect real-life situations and focus also on extensor strength.

Keywords
Muscle activation; Muscle extension force; Flexion force; Female; Daily activities
National Category
Health Sciences
Research subject
Health and Welfare
Identifiers
urn:nbn:se:du-14360 (URN)10.1186/1471-2474-15-154 (DOI)000337326200001 ()24886491 (PubMedID)
Available from: 2014-06-17 Created: 2014-06-17 Last updated: 2017-12-05Bibliographically approved
Albinsson, J., Brorsson, S., Ryden-Ahlgren, Å. & Cinthio, M. (2014). Improved tracking performance of lagrangian block-matching methodologies using block expansion in the time domain: in silico, phantom and in vivo evaluations. Ultrasound in Medicine and Biology, 40(10), 2508-2520
Open this publication in new window or tab >>Improved tracking performance of lagrangian block-matching methodologies using block expansion in the time domain: in silico, phantom and in vivo evaluations
2014 (English)In: Ultrasound in Medicine and Biology, ISSN 0301-5629, E-ISSN 1879-291X, Vol. 40, no 10, p. 2508-2520Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to evaluate tracking performance when an extra reference block is added to a basic block-matching method, where the two reference blocks originate from two consecutive ultrasound frames. The use of an extra reference block was evaluated for two putative benefits: (i) an increase in tracking performance while maintaining the size of the reference blocks, evaluated using in silico and phantom cine loops; (ii) a reduction in the size of the reference blocks while maintaining the tracking performance, evaluated using in vivo cine loops of the common carotid artery where the longitudinal movement of the wall was estimated. The results indicated that tracking accuracy improved (mean - 48%, p<0.005 [in silico]; mean - 43%, p<0.01 [phantom]), and there was a reduction in size of the reference blocks while maintaining tracking performance (mean - 19%, p<0.01 [in vivo]). This novel method will facilitate further exploration of the longitudinal movement of the arterial wall. 

Place, publisher, year, edition, pages
Elsevier, 2014
Keywords
Ultrasound; Motion estimation; Longitudinal movement; Speckle tracking; Arterial wall movement
National Category
Health Sciences
Research subject
Hälsa och välfärd
Identifiers
urn:nbn:se:du-15125 (URN)10.1016/j.ultrasmedbio.2014.05.010 (DOI)000343144400020 ()25130445 (PubMedID)
Available from: 2014-09-01 Created: 2014-09-01 Last updated: 2017-12-05Bibliographically approved
Carlsson, M., Carlsson, T., Olsson, M., Brorsson, S., Malm, C. & Tonkonogi, M. (2014). Peak hand-grip force predicts competitive performance in elite female cross-country skiers. In: : . Paper presented at 19th annual Congress of the European College of Sport Science, 2nd - 7th of July 2014, Amsterdam.
Open this publication in new window or tab >>Peak hand-grip force predicts competitive performance in elite female cross-country skiers
Show others...
2014 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Sport and Fitness Sciences
Research subject
Health and Welfare
Identifiers
urn:nbn:se:du-14039 (URN)
Conference
19th annual Congress of the European College of Sport Science, 2nd - 7th of July 2014, Amsterdam
Available from: 2014-04-25 Created: 2014-04-25 Last updated: 2017-12-14Bibliographically approved
Brorsson, S., Thorstensson, C., Nilsdotter, A. & Bremander, A. (2014). Two different sets of hand exercises: improved grip strength after eight weeks in patients with arthritis. In: : . Paper presented at 15th Annual European Congress of Rheumatology (EULAR), JUN 11-14, 2014, Paris, FRANCE. (s2)
Open this publication in new window or tab >>Two different sets of hand exercises: improved grip strength after eight weeks in patients with arthritis
2014 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Sport and Fitness Sciences
Research subject
Health and Welfare
Identifiers
urn:nbn:se:du-17593 (URN)10.1136/annrheumdis-2014-eular.4883 (DOI)000346919806471 ()
Conference
15th Annual European Congress of Rheumatology (EULAR), JUN 11-14, 2014, Paris, FRANCE
Available from: 2015-05-29 Created: 2015-05-29 Last updated: 2017-12-14Bibliographically approved
Brorsson, S., Carlsson, T. & Carlsson, M. (2013). A new electronic grip force measurement device for hand evaluation. In: Abstracts of the Annual European Congress of Rheumatology EULAR. June 12-15, 2013. Madrid, Spain: . Paper presented at Annual European Congress of Rheumatology EULAR, Madrid, Spain 12-15 June 2013..
Open this publication in new window or tab >>A new electronic grip force measurement device for hand evaluation
2013 (English)In: Abstracts of the Annual European Congress of Rheumatology EULAR. June 12-15, 2013. Madrid, Spain, 2013Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Background: Hand grip force is a good indicator of general muscle strength and can also be used to predict multiple outcomes such as changes in activities of daily living (ADL), disability, mortality and general upper extremity strength. Hand grip force is often measured as the amount of static grip force a subject can produce when measured with a hydraulic dynamometer such as the Jamar or with an electronic device such as the Grippit. The Grippit device measures an average grip force, a peak grip force and force over a set time period. Grippit has shown good reliability for healthy subjects. Grippit, which was developed over 20 years ago in Gothenburg, Sweden is no longer manufactured. Therefore, the need for anewly developed and modernized measurement instrument for use in evaluating hand rehabilitation has arisen.

Objectives: The aim of this study was to evaluate the test-retest reliability of the newly developed instrument GRIP-it and to describe and validate the relationship between grip force measurements from GRIP-it and the original Grippit device.

Methods: Healthy controls (n=43) were included in the study. Two devices were used to evaluate grip force (Newton, N), (i) GRIP-it a newly developed device and (ii) Grippit. Both instruments were used to measure mean and maximal force over 10 seconds.

Results: GRIP-it displayed a mean measurement error of -1.7 ± 0.5% and the corresponding error for Grippit was -1.6 ± 1.9%. All subjects completed the grip force tests and the results for three attempts for each hand. The test-retest reliability was excellent for both pieces of equipment, with ICCs ranging from 0.963 to 0.947 (CI 95% between 0.103 and 0.041) for GRIP-it and from 0.979 to 0.968 (CI 95% between 0.087 and 0.042) for Grippit.

Relationships between Grippit and GRIP-it

There was a significant difference between the measured values derived from Grippit and GRIP-it for both the dominant hand (P < 0.001) and the non-dominant hand (P < 0.01). Grippit gives in general a higher grip force measurement than GRIP-it which is also indicated by the slope (β1) of the regression lines that deviates from 1. However, there were no substantial differences in the grip force when comparing the measurements for the dominant hand with the non-dominant hand for either Grippit (P = 0.071) or GRIP-it (P = 0.404). Based on these non-significant differences between hands and the fact that the model estimates for the intercept (β0) and the slope (β1) are contained within the confidence intervals of the model estimates for the opposite hand, a combined model was derived. The linear regression analysis, with grip force measurements for both hands included, gives: GRIP-it = 49.0 + 0.779 · Grippit. This explains 89.6% of the variance in grip force analyzed by GRIP-it (P < 0.001) see Figure 2. To enable an estimation of grip force measured by Grippit based on GRIP-it values a regression analysis with Grippit as dependent variable gives: Grippit = -18.1 + 1.15 · GRIP-it, which explains 89.6% of the variance in grip force analyzed by Grippit (P < 0.001).

Conclusions: This study showed that GRIP-it has excellent test-retest reliability. Measurements of grip force with GRIP-it are strongly related to those from the original Grippit. The newly developed GRIP-it shows great potential for use in the assessment of hand function and the evaluation of hand rehabilitation.

National Category
Medical and Health Sciences
Research subject
Hälsa och välfärd
Identifiers
urn:nbn:se:du-13606 (URN)
Conference
Annual European Congress of Rheumatology EULAR, Madrid, Spain 12-15 June 2013.
Available from: 2014-06-17 Created: 2014-01-11 Last updated: 2015-12-21Bibliographically approved
Isberg, J., Ribic, I. & Brorsson, S. (2013). Träningen som ger spelarna knäkontroll. Svensk Idrottsforskning: Organ för Centrum för Idrottsforskning (4), 25-27
Open this publication in new window or tab >>Träningen som ger spelarna knäkontroll
2013 (Swedish)In: Svensk Idrottsforskning: Organ för Centrum för Idrottsforskning, ISSN 1103-4629, no 4, p. 25-27Article in journal (Other (popular science, discussion, etc.)) Published
Place, publisher, year, edition, pages
Stockholm: Centrum för idrottsforskning, 2013
National Category
Sport and Fitness Sciences
Research subject
Education and Learning
Identifiers
urn:nbn:se:du-13839 (URN)
Available from: 2014-02-28 Created: 2014-02-28 Last updated: 2017-12-12Bibliographically approved
Brorsson, S., Boustedt, C. & Nordenskiöld, U. (2012). A grip force over 104 Newton is associated to less activity limitations and pain in women with hand ostheoarthritis. Paper presented at 9th COTEC Congress of Occupational Therapy 24–27 May 2012 in Stockholm.
Open this publication in new window or tab >>A grip force over 104 Newton is associated to less activity limitations and pain in women with hand ostheoarthritis
2012 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Medical and Health Sciences
Research subject
Hälsa och välfärd
Identifiers
urn:nbn:se:du-11424 (URN)
Conference
9th COTEC Congress of Occupational Therapy 24–27 May 2012 in Stockholm
Available from: 2012-12-11 Created: 2012-12-11 Last updated: 2015-06-01Bibliographically approved
Lundgren, L., Brorsson, S. & Osvalder, A.-L. (2012). Comfort aspects important for the performance and safety of kitesurfing.. Work: A journal of Prevention, Assesment and rehabilitation, 41(Suppl 1), 1221-1225
Open this publication in new window or tab >>Comfort aspects important for the performance and safety of kitesurfing.
2012 (English)In: Work: A journal of Prevention, Assesment and rehabilitation, ISSN 1051-9815, E-ISSN 1875-9270, Vol. 41, no Suppl 1, p. 1221-1225Article in journal (Refereed) Published
Abstract [en]

Equipment used in sports is of great importance, especially when the equipment is in direct contact with the athlete or is important for safety. In the sport kitesurfing environmental factors and the equipment design are crucial for the comfort and safety. The participants' choice and opinion of equipment can show which factors are considered most important for the performance and to reduce risk for injury. This study has evaluated self-reported information from the participants about what equipment they use, comfort of the equipment and if the equipment has contributed to any injuries. The methods used were questionnaires (n=206) and interviews (n=17), which in combination allows to assess the problem both quantitatively and qualitatively. The results showed that supported leading edge kites are most frequently used, with a waist harness and foot straps to attach the feet. The choice of kite type was mainly based on the discipline of riding for the respondent. Some issues concerning comfort of riding and injury risk the respondents did relate to the design of harness and foot straps. The information from this study can be used for development strategies for industry manufacturers and for further studies in the area of equipment design and biomechanics.

Place, publisher, year, edition, pages
IOS Press, 2012
National Category
Medical and Health Sciences Engineering and Technology
Research subject
Hälsa och välfärd
Identifiers
urn:nbn:se:du-14370 (URN)10.3233/WOR-2012-0306-1221 (DOI)000306361801054 ()22316886 (PubMedID)
Available from: 2014-06-17 Created: 2014-06-17 Last updated: 2017-12-05Bibliographically approved
Brorsson, S., Parker, J. & Olsson, C. (2012). Grip force and muscle activity are associated with kinematics in the golf swing. In: : . Paper presented at ACSM's 59th Annual Meeting and 3rd World Congress on Exercise is Medicine, San Francisco, California, May 29 - June 2, 2012.
Open this publication in new window or tab >>Grip force and muscle activity are associated with kinematics in the golf swing
2012 (English)Conference paper, Oral presentation with published abstract (Refereed)
Keywords
Grip force, kinematics, golf
National Category
Medical and Health Sciences
Research subject
Hälsa och välfärd
Identifiers
urn:nbn:se:du-11423 (URN)000310363302710 ()
Conference
ACSM's 59th Annual Meeting and 3rd World Congress on Exercise is Medicine, San Francisco, California, May 29 - June 2, 2012
Available from: 2012-12-11 Created: 2012-12-11 Last updated: 2015-06-01Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1813-3616

Search in DiVA

Show all publications