Determination of dynamic muscle strength in man with acceleration controlled isokinetic movements

Gransberg, Lennart; Knutsson, E

doi:10.1111/j.1748-1716.1983.tb07346.x

Cited by 77 publications

(33 citation statements)

References 6 publications

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“…The dynamometer was modi®ed to eliminate torque overshoot and correct for gravity [10]. The subjects were seated in a specially constructed chair that enabled comfortable ®xture.…”

Section: Methodsmentioning

confidence: 99%

Muscle performance in fibromyalgia syndrome

Borman

Çeliker

Hasçelik

1999

Rheumatology International

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The objective of the study was to examine the muscle performance, isokinetic muscle strength, muscle endurance ratio, and submaximal aerobic performance in fibromyalgia syndrome (FMS) patients, to evaluate the relation between muscle performance, pain severity, clinical findings, and physical activity level, and to compare the results with healthy control subjects. Twenty-four FMS patients and 15 control subjects participated in this study. Data were obtained about the symptoms, location and onset of pain, treatment, and associated symptoms. Patients and controls underwent an examination of isokinetic muscle strength of right quadriceps on a Cybex dynamometer, and submaximal aerobic performance tests (PWC-170) were done for all subjects. Maximal voluntary muscle strength of the quadriceps was significantly lower in patients compared with the control group. Endurance ratios showing the work capacity were not statistically different between two groups. Submaximal aerobic performance scores were higher in the control group. There was not a relation between the decreased muscle performance and clinical findings, including pain severity, number of tender points, and duration of the symptoms of FMS patients. We found a reduced quadriceps muscle strength and submaximal aerobic performance in patients with FMS, indicating that patients have impaired muscle function.

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“…The dynamometer was modi®ed to eliminate torque overshoot and correct for gravity [10]. The subjects were seated in a specially constructed chair that enabled comfortable ®xture.…”

Section: Methodsmentioning

confidence: 99%

Muscle performance in fibromyalgia syndrome

Borman

Çeliker

Hasçelik

1999

Rheumatology International

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“…The dynamic muscle balance over the functional range of motion is known to constantly change as the joint angle is modified. 13 In addition, at the shoulder, the joint angle where the peak torque is generated has been found to be difficult to reproduce between tests. 14,15 Interests of the angle subgroup agonist-antagonist torque ratios A new interpretative approach of the torque ratios between shoulder agonist and antagonist muscle groups is proposed in the current study.…”

Section: Limits Of Agonist-antagonist Peak Torque Ratiosmentioning

confidence: 99%

Assessment of agonist–antagonist shoulder torque ratios in individuals with paraplegia: a new interpretative approach

et al. 2008

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Study Design: Cross-sectional study. Objective: To evaluate isokinetic shoulder flexor-extensor (F/E) and abductor-adductor (Ab/Ad) torque ratios in individuals with paraplegia using a new interpretative approach. We proposed to study torque ratios according to joint angle sections (151 angle subgroups) over a selected range of motion. Setting: Pathokinesiology Laboratory, Montreal, Canada. Method: Sixteen individuals with complete motor paraplegia, without shoulder pain or impairment, were included in this study. After a preloading period of 1 s, maximum isokinetic concentric contractions of all muscle groups were completed at 30, 60 and 1201 s À1 over the entire tested ranges of motion (70 to À351 for the flexion-extension and 15 to 601 for the abduction-adduction). After the continuous torque curves were rebuilt, the mean F/E and Ab/Ad torque ratios were calculated and analyzed every 151. Results: A significant modification of the F/E (F ¼ 66.3; Po0.001) and Ab/Ad (F ¼ 100.6; Po0.001) torque ratios was observed according to the 151 angle subgroup evaluated. More precisely, a progressive decline of both the F/E and Ab/Ad ratios was noted as the shoulder flexion or abduction progressed. Angular velocity did not have any influence on torque ratio values. Conclusion: Angle subgroup torque ratio analysis leads to a better estimation of the balance between the agonist and antagonist muscle groups than does traditional peak torque ratio analysis. In individuals with paraplegia, this precise estimation of torque ratios may lead to the development of specific shoulder strengthening programs to prevent muscle imbalance and its consequences.

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“…During both the concentric and eccentric actions each subject performed five maximal consecutive contractions at 90°/s. Torque values were corrected for gravitational force [17,27,49]. A test-retest of the Biodex dynamometer used in the present study was performed in ten healthy women and demonstrated intraclass correlation coefficient values of 0.95-0.98 during concentric action and of 0.73-0.89 during eccentric action.…”

Section: Thigh Muscle Torquesmentioning

confidence: 99%

Risk factors for leg injuries in female soccer players: a prospective investigation during one out-door season

Söderman

Alfredson

Pietilä

et al. 2001

Knee Surg Sports Traumatol Art

307

256

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The following possible risk factors for leg injuries in female soccer players were studied: age, anatomical alignment, generalized joint laxity, thigh muscle torque, muscle flexibility, ligamentous laxity of the knee and ankle joints, recent injuries, and duration of soccer exposure. A total of 146 players from 13 teams in the second and third Swedish divisions underwent clinical examination, isokinetic measurements of quadriceps and hamstring torques, and testing of postural sway of the legs. All soccer-related leg injuries resulting in absence from at least one scheduled practice session or game were recorded during one outdoor season (April-October). In 50 players there were 61 traumatic injuries, and 17 players sustained 19 overuse injuries. The overall injury incidence rate (traumatic and overuse) was 5.49/1000 h of soccer. Variables significantly increasing the risk of traumatic leg injuries included generalized joint laxity, low postural sway of the legs, hyperextension of the knee joint, and a low hamstring-to-quadriceps ratio during concentric action. Multivariate logistic regression showed hyperextension of the knee joint, a low postural sway, reduced H/Q ratio during concentric action, and a higher exposure to soccer to significantly increase the risk of traumatic leg injury. All five players who suffered an anterior cruciate ligament injury during the study period had a lower hamstring-to-quadriceps ratio during concentric action on the injured side than on their noninjured side.

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Determination of dynamic muscle strength in man with acceleration controlled isokinetic movements

Cited by 77 publications

References 6 publications

Muscle performance in fibromyalgia syndrome

Muscle performance in fibromyalgia syndrome

Assessment of agonist–antagonist shoulder torque ratios in individuals with paraplegia: a new interpretative approach

Risk factors for leg injuries in female soccer players: a prospective investigation during one out-door season

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