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- Brulin, Christine, et al.
(författare)
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Physical and psychosocial work related risk factors associated with musculoskeletal symptoms among home care personnel
- 1998
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Ingår i: Scandinavian journal of caring sciences. - 0283-9318. ; 12:2, s. 104-110
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this cross-sectional study was to investigate physical and psychosocial aspects of the work environment, sociodemographic data and certain lifestyle factors, and the relationship between these variables and complaints in the shoulder/neck and low back area among female home care personnel. A questionnaire was completed by 361 randomly selected women. Multiple logistic regression analyses were conducted to evaluate the importance of several exposure factors for complaints in the shoulder/neck and low back areas. The results of this study clearly indicate that 'standing in forward-bent and twisted postures' can be viewed as a risk factor for shoulder/neck pain. A combination of this physical exposure and 'no possibility of influencing the planning of work' gave an increase in odds ratio, indicating an interaction between these two exposure indices. However, this interaction was not found for low back pain. 'Standing in forward-bent and twisted postures', 'standing in awkward positions' and whether the subject had children staying at home were significantly correlated to complaints about the low back. In fact, the latter factor decreased the risk of having complaints. The results indicated that certain physical and psychosocial work risk factors could influence shoulder/neck and low back pain.
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| 4. |
- Larsson, Barbro, 1952-, et al.
(författare)
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Reproducibility of surface EMG variables and peak torque during three sets of ten dynamic contractions
- 1999
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Ingår i: Journal of Electromyography & Kinesiology. - 1050-6411 .- 1873-5711. ; 9:5, s. 351-357
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Tidskriftsartikel (refereegranskat)abstract
- The interpretation of the electromyogram (EMG) of dynamic contractions might be difficult because the movement per se introduces additional factors that could affect its characteristics. There is a lack of studies concerning the reproducibility of surface EMG registrations during dynamic contractions. The aim was to investigate the during-the-day reproducibility (using intra-class correlation; ICC) of the peak torque (PT) and the EMG variables (without removing the electrodes) of dynamic contractions. Ten healthy subjects performed three sets of 10 dynamic maximum right-knee extensions with a one-hour interval in between, using an isokinetic dynamometer and the PT was determined. EMG signals were recorded from the right vastus lateralis, rectus femoris and vastus medialis muscles using surface electrodes and the mean frequency of the power spectrum (MNF [Hz]) and the signal amplitude (RMS [μV]), were computed. The ability to relax in-between the maximum extensions was calculated as a ratio of the RMS during the passive flexion phase and the RMS during the active extension phase of each contraction cycle: the signal amplitude ratio (SAR).Both PT (ICC=0.99) and RMS (ICC=0.83–0.98) had good reproducibility. The reproducibility of MNF was good for all muscles when the mean of contraction nos.: 1–10 was used. Vastus lateralis had the highest ICC among the three muscles. The reproducibility of SAR was generally poor (ICC<0.60). The present study showed good reproducibility for common EMG variables (MNF and RMS) obtained during maximum isokinetic contractions.
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| 6. |
- Lindström, Britta, et al.
(författare)
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Skeletal muscle fatigue and endurance in young and old men and women
- 1997
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Ingår i: The journals of gerontology. Series A, Biological sciences and medical sciences. - 1079-5006 .- 1758-535X. ; 52A:1, s. B59-B66
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Tidskriftsartikel (refereegranskat)abstract
- The effects of increasing age on skeletal muscle fatigue and endurance were assessed in 22 healthy young (14 men and 8 women; mean age, 28 +/- 6 years) and 16 healthy old (8 men and 8 women; mean age, 73 +/- 3 years) individuals. All subjects performed 100 repeated maximum dynamic knee extensions at 90 degrees.s-1 (1.57 rad.s-1) using an isokinetic dynamometer (Cybex II). Peak torque was recorded during every contraction, and for each individual the maximal voluntary contraction (MVC), the fatigue rate, the endurance level, and the relative reduction in muscle force were determined. MVC and endurance level were significantly lower in old men and women, but there was no discernible difference in relative muscle force reduction and fatigue rate between young and old individuals. We conclude that thigh muscles of older individuals are weaker than those of younger individuals, but relative to their strength, older individuals have similar properties as younger individuals with respect to muscle fatigue and endurance.
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| 7. |
- Lundberg, Gunnar, et al.
(författare)
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The relationships between spinal sagittal configuration, joint mobility, general low back mobility and segmental mobility in female homecare personnel
- 1999
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Ingår i: Scandinavian Journal of Rehabilitation Medicine. - : Informa UK Limited. - 0036-5505 .- 1940-2228. ; 31:4, s. 197-206
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to investigate joint mobility, segmental and general spinal mobility and their interrelationship in 607 women working as homecare personnel. Joint mobility (mainly peripheral) was estimated using the "Beighton" score. Spinal posture and mobility were measured by Debrunner's kyphometer. Passive segmental mobility and pain provocation were estimated manually. Reliability tests between two physiotherapists of segmental mobility and pain provocation (n = 150 subjects) were performed. Positive correlations were found between joint mobility, sagittal thoraco-lumbar mobility and segmental mobility. Hyperlordosis (>39 degrees) was associated with greater lumbar mobility. The reliability of manual segmental mobility and segmental pain provocation was good, especially in the lowest back segments (kappa approximately 0.7). Joint mobility, general mobility and segmental spinal mobility intercorrelated. Segmental mobility manually estimated showed intertester reliability. The good positive correlation between sagittal lumbar mobility and manually tested segmental mobility indicates criterion validity for the latter.
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| 10. |
- Lundqvist, Anna, et al.
(författare)
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Neuropsychological Aspects of Driving After Brain Lesion: Simulator Study and On-Road Driving
- 1997
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Ingår i: Applied neuropsychology. - : Informa UK Limited. - 0908-4282 .- 1532-4826. ; 4:4, s. 220-230
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Tidskriftsartikel (refereegranskat)abstract
- 29 patients with brain lesion and 29 matched controls completed a neuropsychological test battery to assess perceptual, cognitive, and executive functioning and were tested on driving performance in a simulator and actual road conditions. The patients were socially well recovered with a high rate of employment. Patients performed significantly worse than controls on the test battery, especially on executive and cognitive functions. Patients drove as well as controls in predictable situations in the advanced simulator used In unpredictable situations, patients demonstrated longer reaction time (RT) and safety margins, as well as difficulties in allocating processing resources to a secondary task. Patients showed significantly less attention, worse traffic behavior, and less risk awareness when driving in real traffic. 41% of the patients did not pass the driving test. The neuropsychological test battery was factor analyzed into 4 factors: executive capacity, cognitive capacity, automatic attentional capacity, and simple perceptual-motor capacity. The second factor was the most significant, with a simultaneous capacity test predicting driving performance with 78% confidence.
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