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Influence of Passive Stiffness of Hamstrings on Postural Stability

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Kuszewski M., Gnat R., Sobota G., Myśliwiec A.
Journal of Human Kinetics
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2015
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vol. 45
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issue 1
49-57
EN
The aim of the study was to explore whether passive stiffness of the hamstrings influences the strategy of maintaining postural stability. A sample of 50 subjects was selected; the final analyses were based on data of 41 individuals (33 men, 8 women) aged 21 to 29 (mean = 23.3, SD = 1.1) years. A quasi- experimental ex post facto design with repeated measures was used. Categories of independent variables were obtained directly prior to the measurement of the dependent variables. In stage one of the study, passive knee extension was measured in the supine position to assess hamstring stiffness. In stage two, the magnitude of postural sway in antero-posterior direction was measured, while varying the body position on a stabilometric platform, both with and without visual control. The margin of safety was used as a measure of postural control. The magnitude of the margin of safety increased significantly between the open-eye and closed-eye trials. However, although we registered a visible tendency for a larger increase of the margin of safety associated with lower levels of passive hamstrings stiffness, no significant differences were found. Therefore, this study demonstrated that hamstring stiffness did not influence the strategy used to maintain postural stability.
2
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Assessment of the Influence of Cervical Spine Traction on the Change of Heart Hemodynamic Parameters

100%
Myśliwiec A., Saulicz E., Kuszewski M., Klapuch M.
Physiotherapy and Health Activity
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2014
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vol. 22
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issue 1
15-20
EN
Background: The vast majority of pain dysfunctions of the cervical spine is underlain by prolonged overload and one effective therapy is traction. The aim of this study is to assess the influence of cervical spine traction on changes in heart rate and arterial blood pressure in people with arterial hypertension and normotension. Material/Methods: The study involved a total of 168 patients, in whom chronic cervical spine pain syndrome of low intensity, with no radiation of symptoms and with no significant functional limitations occurred. The subjects were intentionally allocated into a group with arterial hypertension and a group with normotension. Results: The analysis of the obtained results showed that cervical spine traction does not strain the cardiovascular system. In the group of subjects with arterial hypertension, a linear value reduction of all the heart hemodynamic parameters measured in the successive trials was observed. The most significant difference between the initial and final test was observed in patients, in whom the traction procedure was only simulated. Conclusions: Cervical spine traction performed according to D. Saunders’ method does not constitute any threat to patients with arterial hypertension.
3
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Possible paradox: Muscle stiffness - indispensable or undesirable?

100%
Kuszewski M., Saulicz E., Gnat R.
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2008
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vol. 16
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issue 1
92-98
PL
Sztywność mięśnia jest najczęściej określana jako stosunek zmiany jego długości do wielkości siły, w wyniku której owa zmiana zachodzi. Wzrost sztywności tkanki mięśniowej to problem, z którym fizjoterapia styka się coraz częściej. Z jednej strony stanowi ona czynnik decydujący o efektywnej stabilizacji stawu, z drugiej natomiast zwiększa komponentę sił dociskających powierzchnie stawowe do siebie, co po dłuższym czasie może prowadzić do zmian przeciążeniowych i szybszego "zużywania" się chrząstki stawowej. Niniejsza praca przedstawia aktualne poglądy dotyczące zjawiska sztywności, a także podejmuje próbę poszukiwania jej uwarunkowań.
EN
Muscle stiffness is usually described as the ratio of change in muscle length to value of force causing this change. Nowadays, increase in muscle stiffness constitutes a problem that physiotherapy meets more and more often. On one hand it creates a crucial factor enabling effective stabilization of the joint, on the other hand - may accelerate overloading changes due to inevitable increase of compressive forces acting on articular surfaces. The objective of the paper is to present modern views on stiffness phenomenon and undertake a pursuit of factors conditioning it.
4
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An Assessment of Rotational Mobility of the Trunk among Teenagers with Faulty Posture

64%
Matyja M., Saulicz E., Saulicz M., Kokosz M., Gnat R., Kuszewski M., Bereszko J., Gogola A.
Journal of Human Kinetics
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2010
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vol. 24
43-50
EN
Body posture is determined by many factors, including central regulation connected with anti-gravitational mechanism which develops in ontogenesis. Postural disorders arise as a result of a compensatory anti-gravitational mechanism, in which the main component is reduced postural tone (volume and distribution disorders). Compensation mechanisms consist in improper alignment of particular body segments (distribution disorders) (e.g., increase or decrease of spinal curvatures, external or internal rotation of the lower limbs, valgus and varus deformity of the knees and feet). Such disorders may constitute a reason for abnormal component development, thus limiting trunk rotational mobility.An aim of the study was to assess the range of trunk rotational mobility.Pupils (n=123) aged 13-15 underwent the following parameter evaluations: 1. Posture according to Kasperczyk's scoring method, 2. Postural tone volume by analysis of pelvis control in the long sitting, 3. Range of trunk rotation with use of upper tension test (muscle latissimus dorsi and thoracolumbar fascia).Positive tension test was recorded in 32 children (21 unilateral and 11 bilateral). Diversification of statistical averages of scoring for body posture, from the lowest (x=6.41) in 91 subjects with negative tension test, to the highest (x=7.72) in 11 subjects with double-sided positive result was recorded. Statistical analyzes confirmed significance of correlation between body posture's quality and trunk's rotational mobility (r=0.286 at p=0.001), as well as between volume of postural tone and range of trunk's rotational mobility. Coefficients of correlation amount to, respectively, for tension test and free sitting position r=0.187, p=0.038; and for tension test and corrected sitting position r=0.253, p=0.05. Disorders of muscle tone volume and distribution cause limitation of trunk rotational mobility development.
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