- Email: [email protected]
Muscle function in primary fibromyalgia — A preliminary study
1006
Abstracts-International
Society of Binmechanics
X11 Congress LYHY
EXPERIMENTAL MEASUREMENTSOF PROXIMAL TIBIAL DISPLACEMENTS UNDER LOAD: COMPARISON WITH FE MODELS. Ariel Dujovne and Henk W. Wevers. Dept. of Mechanical Engineering, Clinical Mechanics Group, Queen’s University, Kingston, Ontario, Canada, K7L 3N6. Mediolateral expansion and axial displacement of the human tibia were measured to compare results to a finite element model (FEM) of the proximal tibia. A physiological load distribution was applied using a 5 degrees of freedom load tranfer mechanism. The distal end of the specimen was fastened by means of a rigid supporting frame. Fixed points that corresponded to nodes of the finite element mesh were chosen at a level 12mm below the subchondral bone surface. Metal landmarks were inserted at these points and the displacement of the bone was measured using dial gauges. Load steps of 200 N were applied up to a maximum of 2000 N. The output data were normalized with respect to size. Mediolateral expansion values ranged from 0.020 to 0.075 mm (average 0.050) and axial displacement values ranged from 0.085 to 0.125 mm (average 0.105). The values for the FEM were 0.159 mm for the mediolateral expansion and 0.095 mm for the axial displacement. The theoretical and experimental values have a close correlation in the axial displacements, whereas values of mediolateral expansion indicate an overestimation by the FEM. The discrepancy in mediolateral expansion may be explained by the simplification introduced in the FE model. The in vitro testing is also helpful in the analysis and design of prostheses.
MUSCLE STRENGTH GEVELOPMENT IN dGYS AGED 7 - 14 Lschoslaw B.Dworak Department of Biomschanics Academy of Physical Education , 60-776 Poznan , Poland. The aim of this study was to estimate the natural trend of muscle torque pattern in a population of 7-14-year-old boys,in relation to their somatic and motor development growth. Assuming that the generalized notion of muscle torque is the sum of torques generated by representative muscle groups, ws used strain-gauge dynamomstry in static conditions to examined maximal flexor and extensor torques of the right elbow,hip and knee joints and the trunk, head and neck extensors as well as right hand grip etrength.All these tests were of semilongitudinal character. Measurements of all torque, somatic and motoric parameters were carried out once a year during a four-year period. Data concerning development of trends of the tested parameters and their correlations were analyzed with absolute and relative values taken into account. In the analyzed span of age 7-14 the progression of soms parameters were : 284.7 y(, for the sum of muscle torques , 74.1 y! for the sum of relative muscle torques,205.0 b(, and 38.3 >$ for the maximal and relative hand grip strength and approximately 32.0 % and 252.0 76 for running velocity and maximal phosphagen power.
MUSCLE
FUNCTION
IN PRIMARY
FIBROMYALGIA
- A PRELIMINARY
STUDY.
Solbritt RantapZi-Dahlquist (3), Bjijrn Gerdle cl,21 Jessica Elert (1,2), and Karin Henriksson-Larsen (1,2). National Institute of Occupational Health Cl), Box 6104, S-900 06 Umed and departments of Clinical Physiology (2) and Rheumatology (3), University of Umea, S-901 87 UmeA, Sweden. The origin of poor muscle function and muscle pain in patients with primary fibromyalgia is unknown. 8 patients with primary fibromyalgia (PF) and 10 healthy controls, all women aged 40-50, performed 100 maximal shoulder flexions using an isokinetic dynamometer. Surface EMG was registered from the trapezius and the deltoid. Mechanical performance and were analysed on a microsupercomputer. EMG variables, for each contraction, Neither mechanical values nor mean power frequency differed between the two groups. The contraction level in the period between active shoulder flexions was significantly higher in the patient group (20%) than in the control group (8%). The results indicated that tension and poor coordination plays a part in developing or maintaining muscle pain in PF patients.
Abstracts-International
Society of Binmechanics
X11 Congress LYHY
EXPERIMENTAL MEASUREMENTSOF PROXIMAL TIBIAL DISPLACEMENTS UNDER LOAD: COMPARISON WITH FE MODELS. Ariel Dujovne and Henk W. Wevers. Dept. of Mechanical Engineering, Clinical Mechanics Group, Queen’s University, Kingston, Ontario, Canada, K7L 3N6. Mediolateral expansion and axial displacement of the human tibia were measured to compare results to a finite element model (FEM) of the proximal tibia. A physiological load distribution was applied using a 5 degrees of freedom load tranfer mechanism. The distal end of the specimen was fastened by means of a rigid supporting frame. Fixed points that corresponded to nodes of the finite element mesh were chosen at a level 12mm below the subchondral bone surface. Metal landmarks were inserted at these points and the displacement of the bone was measured using dial gauges. Load steps of 200 N were applied up to a maximum of 2000 N. The output data were normalized with respect to size. Mediolateral expansion values ranged from 0.020 to 0.075 mm (average 0.050) and axial displacement values ranged from 0.085 to 0.125 mm (average 0.105). The values for the FEM were 0.159 mm for the mediolateral expansion and 0.095 mm for the axial displacement. The theoretical and experimental values have a close correlation in the axial displacements, whereas values of mediolateral expansion indicate an overestimation by the FEM. The discrepancy in mediolateral expansion may be explained by the simplification introduced in the FE model. The in vitro testing is also helpful in the analysis and design of prostheses.
MUSCLE STRENGTH GEVELOPMENT IN dGYS AGED 7 - 14 Lschoslaw B.Dworak Department of Biomschanics Academy of Physical Education , 60-776 Poznan , Poland. The aim of this study was to estimate the natural trend of muscle torque pattern in a population of 7-14-year-old boys,in relation to their somatic and motor development growth. Assuming that the generalized notion of muscle torque is the sum of torques generated by representative muscle groups, ws used strain-gauge dynamomstry in static conditions to examined maximal flexor and extensor torques of the right elbow,hip and knee joints and the trunk, head and neck extensors as well as right hand grip etrength.All these tests were of semilongitudinal character. Measurements of all torque, somatic and motoric parameters were carried out once a year during a four-year period. Data concerning development of trends of the tested parameters and their correlations were analyzed with absolute and relative values taken into account. In the analyzed span of age 7-14 the progression of soms parameters were : 284.7 y(, for the sum of muscle torques , 74.1 y! for the sum of relative muscle torques,205.0 b(, and 38.3 >$ for the maximal and relative hand grip strength and approximately 32.0 % and 252.0 76 for running velocity and maximal phosphagen power.
MUSCLE
FUNCTION
IN PRIMARY
FIBROMYALGIA
- A PRELIMINARY
STUDY.
Solbritt RantapZi-Dahlquist (3), Bjijrn Gerdle cl,21 Jessica Elert (1,2), and Karin Henriksson-Larsen (1,2). National Institute of Occupational Health Cl), Box 6104, S-900 06 Umed and departments of Clinical Physiology (2) and Rheumatology (3), University of Umea, S-901 87 UmeA, Sweden. The origin of poor muscle function and muscle pain in patients with primary fibromyalgia is unknown. 8 patients with primary fibromyalgia (PF) and 10 healthy controls, all women aged 40-50, performed 100 maximal shoulder flexions using an isokinetic dynamometer. Surface EMG was registered from the trapezius and the deltoid. Mechanical performance and were analysed on a microsupercomputer. EMG variables, for each contraction, Neither mechanical values nor mean power frequency differed between the two groups. The contraction level in the period between active shoulder flexions was significantly higher in the patient group (20%) than in the control group (8%). The results indicated that tension and poor coordination plays a part in developing or maintaining muscle pain in PF patients.