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- Crommert, Martin Eriksson, 1974-
(författare)
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On the role of transversus abdominis in trunk motor control
- 2011
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- All trunk muscles are important contributors to spine stability. However, the deepest abdominal muscle, transversus abdominis (TrA), with its characteristically horizontal fibre orientation seems to serve a unique function in trunk motor control. The main mechanical role of TrA is believed to be to contribute to vertebral alignment during imposed moments on the trunk, executed mainly via either regulating the pressure level within the abdominal cavity and/or transmit forces to the spine via the thoracolumbar fascia. However, the complete function of TrA and what factors affect its activation are still not fully understood. The purpose of the present thesis was to investigate the role of TrA in trunk motor control, specifically in relation to the presence or absence of postural demand on the trunk.The timing and magnitude of TrA activation were investigated, in relation to other trunk muscles, with intramuscular fine-wire electrodes in different loading situations and body positions with varying postural demand.In a side-lying position, with no postural demand of keeping the trunk upright, the activation of TrA was delayed relative the superficial abdominal muscles compared to previous experiments performed in a standing position. The timing and magnitude of activation of TrA did not depend upon the direction of perturbation. In the standing position, different static arm positions revealed that the activation of TrA co-varied with variations in the degree of postural demand on the trunk and also the imposed moments, regardless of moment direction. Finally, a study on rapid arm flexion movements confirmed that TrA is part of the pre-programmed anticipatory response in advance of known perturbations. The activation magnitude of TrA was the same regardless if the arm movement induced flexion or extension moments on the trunk.In conclusion, the activation of TrA is associated with the upright postural demand on the trunk and with balancing imposed moments acting on the spine, regardless their direction. The findings are in support of the beliefs that TrA act as a general, direction non specific, stabilizer of the lumbar spine.
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| 2. |
- Holmgren, Theresa, 1974-
(författare)
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Exercise treatment of patients with long-standing subacromial pain
- 2013
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Subacromial pain is the most common problem among patients with shoulder complaints seeking primary care. The recommended treatment for these patients is primarily non-surgical with a focus on exercise treatment. If this treatment fails arthroscopic subacromial decompression (ASD) followed by exercise treatment is recommended. Surgical treatment with ASD has increased substantially in Sweden in recent years even though studies comparing exercise treatment with surgery report equally positive results. Still, there is a need of evidence based preand postoperative exercise treatments, standardised and described in detail, to guide treatment of these patients in clinical practice.The overall aim of this thesis was to evaluate the efficacy of pre- and postoperative exercise strategies on shoulder function and how the preoperative strategy affects the need for surgery in patients with long-standing subacromial pain.This thesis comprises four papers which are based on two randomised controlled trials. In study A, patients were randomised after ASD surgery to either physical therapist (PT) supervised strength-endurance exercises for the rotator cuff and scapula stabilisers or to home-based movement exercises for a period of three months. Shoulder function and pain, health related quality of life and return to work was evaluated for 6 months (paper I). In study B, patients on the waiting list for surgery were randomised to either specific exercise strategy with strengthendurance exercises for the rotator cuff and the scapula stabilisers or to control exercises with movement exercises for the neck and shoulders for a period of three months. After completing the exercise program and also after 12 months, shoulder function and pain, need for surgery and health related quality of life was evaluated. Baseline shoulder function, rotator cuff status and radiological findings were analysed in relation to the choice of surgery (paper II, III). The minimal important clinical change (MIC) of the Constant-Murley (CM) score, used as primary outcome in this thesis, was determined by using a visual anchor-based MIC distribution method (paper IV).Six months after ASD surgery, patients who performed PT-supervised strength-endurance exercises improved significantly more in shoulder function and pain compared to patients who had performed home-based movement exercises (paper I). Patients on the waiting list for surgery who performed specific strength-endurance exercises had significantly greater improvements in shoulder function and pain compared to patients performing movement exercises (paper II). A significantly lower proportion of those performing specific strength-endurance exercises chose surgery at the three- and 12 months follow-ups (paper II, paper III). Low baseline values in shoulder function and pain measured with the CM score and/or having a full thickness rotator cuff rupture were associated with an increased risk of choosing surgery (paper III). Regarding the CM score, a change between 17-24 points seems to be clinically important for patients with long-standing subacromial pain (paper IV).Supervised strength-endurance exercises seem to be more effective than home-based movement exercises after ASD surgery. For patients on the waiting list for surgery, the specific strategy of strength-endurance exercises was effective in improving shoulder function and pain and the need for surgery was reduced at 12 months. Low baseline values for shoulder function and pain measured with the CM score and/or having a full thickness rotator cuff tear seem to be predictors for choosing surgery. The CM score is able to detect the MIC in individual patients with long-standing subacromial pain when the rotator cuff is intact. In all patients with longstanding subacromial pain, the MIC value was dependent on the subgroup as well as the choice of statistical analysis.
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| 3. |
- Sjödahl, Jenny, 1979-
(författare)
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Pregnancy-related pelvic girdle pain and its relation to muscle function
- 2010
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Pregnancy-related lumbopelvic pain affects approximately 50% of all pregnant women. For the majority the pain disappears during the first months after delivery; however, for a significant number of women, the pain is persistent, with little improvement for more than three months after delivery. Moreover, women who experience persistent lumbopelvic pain three months postpartum are at substantial risk for new episodes or for chronic lumbopelvic pain later in life. Hence, pregnancy-related lumbopelvic pain should be considered a major public health issue. In order to develop and offer specific treatment strategies, it is important to identify different subgroups of lumbopelvic pain based on different clinical presentations. Pelvic girdle pain (PGP) is one of the major subgroups of pain related to pregnancy. There is no consensus regarding the underlying mechanisms although instability in the pelvis has been proposed as one of the possible mechanism; thus, further studies are necessary to determine how to treat these women. The local lumbopelvic muscle system, including the pelvic floor muscles (PFM) is thought to contribute to the stabilization of the pelvis and they are also the target for many treatment strategies for lumbopelvic pain.The overall aim of this thesis was to improve rehabilitation for women with persistent postpartum PGP by investigating three areas, including: 1) the postural response of the PFM, 2) the effect of home-based specific stabilizing exercises (SSE) that target the local lumbopelvic muscle system and, 3) predictors for disability at 15 months postpartum.The thesis comprises three studies: A) a methodological study, B) an experimental study, and C) a clinical randomized controlled trial (RCT). The data is mainly based on muscle function, including recordings of electromyographic (EMG) activation, muscle endurance, and muscle strength. We also collected subjective ratings of disability, healthrelated quality of life, and pain.The methodological study showed that the designed protocol, which included limb movements performed at a comfortable speed in both standing and supine positions, was useful for detecting a postural response in the PFM. The experimental study demonstrated that women with persistent postpartum PGP and those free of pain exhibited a feed-forward mechanism in the PFM that responded in anticipation to leg lifts performed in a supine position. However, we cannot rule out the possibility that women with difficulties in transferring load between the trunk and legs (i.e., those with functional pelvic instability) might have a different postural response in the PFM. In the present study, one woman with persistent postpartum PGP failed to present a feed-forward mechanism in the PFM, in agreement with previous studies on other parameters of the PFM from other similar groups.The clinical RCT demonstrated that the concept of home-based SSE with visits every second week with the treating physiotherapist was not more effective than the clinical natural course for improving subjective ratings or muscle function in women with persistent postpartum PGP.A linear regression analysis revealed a complex picture that suggests that disability 15 months postpartum in women with persistent PGP could be partially predicted by two interaction effects comprising factors from different dimensions: biological, physical functioning, and self-rated function. The proposed association between muscle function and PGP was strengthen. New approaches are most likely needed to further identify subgroups of patients with persistent postpartum PGP that can be considered homogeneous for treatment.
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| 4. |
- Wåhlin, Charlotte, 1961-
(författare)
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The Rehabilitation Process for Individuals with Musculoskeletal and Mental Disorders : Evaluation of Health, Functioning, Work Ability and Return to Work
- 2012
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Musculoskeletal disorders (MSD) and mental disorders (MD) are common among working-age individuals, and reduced work ability is often a problem that influences functioning in working life. Having MSD and MD is also a common cause of seeking health care and these conditions account for the majority of sick leave in most western countries. The overall aims of the thesis were to increase knowledge about biopsychosocial assessment of health, functioning and work ability for individuals with MSD and MD seeking care. A further aim was to gain better understanding of praxis behaviour in the rehabilitation process for sick-listed patients by evaluating patient-reported work ability, type of interventions given, usefulness of interventions, and return to work.This thesis comprises four studies based on two different cohorts. A cross-sectional design was used for studies I and II, which included 210 individuals diagnosed with MSD and MD seeking occupational health services. Data collection consisted of questionnaires to patients on self-reported health, functioning, work conditions, work ability and reports of professional assessment of diagnosis, main clinical problem, recommended intervention and sick leave. Studies III (n=699) and IV (n=810) were based on a longitudinal cohort study, ReWESS, with a 3-month follow-up comprising individuals who sought primary health care or occupational health services for MSD or MD and were sick-listed. The data collection included repeated questionnaires to the patients on self-reported health, functioning, work conditions, work ability, type and usefulness of intervention and return to work.There was an association between the professional biopsychosocial assessment and patients’ self-reported measures of health, functioning and work ability in clinical reasoning. Self-reported health and work measures can complement the expert-based diagnosis. Patients who had MSD and MD with co-morbid conditions reported more problems with mental functioning, had higher psychological demands at work and reported poorer work ability compared with those with MSD only. Patients with co-morbid conditions also had worse outcome compared to having mental disorders only. Psychosocial problems and activity limitations concerning social interaction skills were a frequent problem. This can be identified in clinical screening by physiotherapists in dialogue with the patient using the Patient-Specific Functional Scale. Three-quarters of sick-listed individuals with MSD or MD returned to work within 90 days. The treatment approach to sick-listed persons is still very medical and clinically oriented. Access to work-related interventions seems to be limited in the early rehabilitation process and may not be equal in practice. Those who were younger, had higher educational level and reported stronger health resources were favoured. There is a need to strive for access to work-related interventions.Return to work was associated with receiving combined clinical- and work-related interventions for patients with MD, and with better health-related quality of life, positive return to work expectations and better work ability for patients with MSD. Factors associated with return to work can be identified using self-reported measures. Patients with MD who received a combination of work-related and clinical interventions perceived best usefulness and best effect of health care contacts on work ability. Patients with MSD did not report as good usefulness. There seems to be a gap between scientific evidence and praxis behaviour in the early rehabilitation process; unimodal rehabilitation was widely applied, use of a multimodal treatment approach was limited and only one-third received work-related interventions. For patients with MSD, behavioural treatment seems to be underutilized in clinical practice considering the effect it may have on developing coping strategies and reducing symptoms. In order to meet recommendations in guidelines, physical activity needs to increase as a treatment strategy for patients with MD. A clinical implication is that the rehabilitation process needs to adopt a broader perspective for patients with MSD and MD to include patients’ individual health-related needs, aspects of employment and work conditions. Still, it remains a challenge to understand who needs what type of intervention.
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| 5. |
- Nilsing Strid, Emma, 1973-
(författare)
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The Sick Leave Process : Sick Leave Guidelines, Sickness Certificates, and Experiences of Professionals
- 2013
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Decisions on entitlement to sickness benefits and return to work interventions have substantial impact on individuals’ lives and on society. In most Western European countries, such decisions are based on sickness certificates, which should provide information on how a disease or injury reduces the individual’s work ability. These are challenging and complex assessments. In 2008, guidelines for the management of sick leave were implemented in Sweden, emphasizing early assessments of work ability and return to work, and increasing the quality demands of sickness certificates by underscoring descriptions of activity limitations related to work. The overall aim of this thesis was to gain a deeper knowledge of the sick leave process with special emphasis on the content of sickness certificates and primary health care (PHC) professionals’ experiences with the process. Specific aims were to compare the quality of sickness certificates regarding descriptions of functioning by the use of WHO’s International Classification of Functioning, disability, and health (ICF), as well as the prescribed interventions before versus after implementation of the Swedish sick leave guidelines.The thesis comprises three studies. A cross-sectional design was used in studies I and II, which included 475 and 501 new sickness certificates consecutively collected in Östergötland County, Sweden, in 2007 and 2009, respectively. Text on functioning was analysed with a deductive content analysis using the ICF. Study III was an exploratory study using data from four semi-structured focus group discussions with a purposeful sample of PHC professionals (n=18) in Östergötland County. An inductive content analysis was used in this study.The thesis comprises three studies. A cross-sectional design was used in studies I and II, which included 475 and 501 new sickness certificates consecutively collected in Östergötland County, Sweden, in 2007 and 2009, respectively. Text on functioning was analysed with a deductive content analysis using the ICF. Study III was an exploratory study using data from four semi-structured focus group discussions with a purposeful sample of PHC professionals (n=18) in Östergötland County. An inductive content analysis was used in this study.An overall conclusion drawn from this thesis is that patient functioning and needs might not be adequately communicated in the sick leave process. Despite the implementation of sick leave guidelines, this information is limited in sickness certificates and the collaboration is poor among the involved stakeholders, i.e., health care, the social insurance office, the employer and the OHS. The basis for decisions on entitlement to sickness benefits could be improved by including a description of the patients’ activity limitations or participation restrictions related to work demands. One way to enhance the decision basis might be to use the available team competencies at the PHC.
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