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Evaluation of relationship between the results of selected tests for muscle strength assessment of the hip abductors

Szczygieł E., Kotla K., Masłoń A., Golec J., Czechowska D., Staszkiewicz R., Krzywda E., Golec E.

Acta of Bioengineering and Biomechanics

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2018

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Vol. 20, no. 2

125--131

EN

Purpose: The assessment of hip joint abductor muscle strength is most often carried out using a dynamometric test. However, both in clinical practice and literature, evaluation is performed by means of the single-leg half-squat or the amount of abduction movements performed in the hip joint. In this context, the question arises whether the results of individual tests are convergent. The aim of the study is to evaluate the relationship between strength of the hip abductor muscle measured by dynamometer, the single-leg-squat and the number of repetitions of the movements in time. Methods: A group of 35 students (20 women and 15 men) between 20 and 24 years old participated in the study. Each student was subjected to three tests assessing the condition of the hip and associated abductor muscles. Those included: assessment of hip joint abduction muscle strength in a dynamometric study, assessment of the number of abdomen movements performed lying on the side and standing, during a 30-second interval, and the single-leg-squat test. Results: Based on the tests conducted, a significant relationship was observed between the muscle strength measurement results for the left and right side in the dynamometric study and the number of hip abduction repetitions in 30 seconds and the single-leg-squat test. Conclusions: The obtained results indicate a significant relationship between the results of all the tests. In practice, this means that the tests can be used interchangeably.

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Head position influence on stabilographic variables

Szczygieł E., Piotrowski K., Golec J., Czechowska D., Masłoń A., Bac A., Golec E.

Acta of Bioengineering and Biomechanics

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2016

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Vol. 18, no. 4

49--54

EN

Purpose: Head constitutes 6% of our body weight and significantly influences human body motor system mechanics. From physiological point of view, it should be located at extension of body middle line. Its location being modified results in many consequences in motor system. Our research was aimed at assessing the influence of head position on human body balance stabilographic variables. Methods: The research was made on a group of 62 patients: 45 women and 17 men, aged from 40 to 60 yrs, 46 yrs on average. Head position in sagittal and frontal plane was assessed with photogrammetric method. Chosen stability parameters were estimated with dynamometric platform PEL 38 and computer software TWIN 99. Results: The results confirmed correlations between existing stabilographic values and head position in frontal plane only. Head position, when changed in this plane, increased the amplitude ( p = 0.001) and average speed of body gravity center trembilng ( p = 0.002). There were no significant relations found in sagittal plane ( p > 0.05). Conclusions: Our results show that the head position influences stabilographic variables. Its change in frontal plane decreases body posture stability to the largest extent.

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Respiratory chest movement measurement as a chair quality indicator – preliminary observations

Szczygieł E., Zielonka K., Mazur T., Mętel S., Golec J.

International Journal of Occupational Safety and Ergonomics

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2015

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Vol. 21, No. 2

207--212

EN

Regardless of the constantly increasing time man is spending in a sitting position, there is still a lack of objective chair quality assessment criteria. The aim of this paper is to find the answer to whether respiratory chest movement measurements can be a chair quality indicator. The study included 34 participants (mean 34.7 years ± 5.2). Their chest movements were assessed using respiratory inductive plethysmography while sitting on two subsequent chairs. Significant differences in chest movements depending on chair type were observed concerning the breathing duct (upper and lower) and breathing movement amplitude. The amplitude of the upper respiratory track in the first chair was higher (239.4 mV) compared with the second seat (207.3 mV) (p = .018). The analyzed parameters of respiratory chest movement may become a helpful indicator for design and selection of chairs which enable people to both work and relax in the most ergonomic conditions.

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Biomechanical influences on head posture and the respiratory movements of the chest

Szczygieł E., Węglarz K., Piotrowski K., Mazur T., Miętel S., Golec J.

Acta of Bioengineering and Biomechanics

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2015

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Vol. 17, no. 2

143--148

EN

Purpose. The head represents 6% of total body weight, therefore it can significantly affect the biomechanics of human posture control, movements and activities. When set out of vertical body axis, head position interferes with the work of the other links in the kinematic chain. The aim of our study was to evaluate the effect of head posture on the breathing activities of the chest. Material and methods: The research was conducted on a group of 65 patients (51 years ± 9.8 years), including 48 women and 17 men. Head posture and chest movements were assessed using a photogrammetric method. Results: The results confirmed the existence of a negative correlation between head position in the sagittal plane and movements of lower ribs. Forward head posture resulted in lower amplitude of costal arch motion: for the transverse plane Spearman’s R = –0.296, for the frontal plane; –0.273, –0.289. Tilting the head in the frontal plane also influenced the change in the biomechanics of breathing and contributed to a reduction of respiratory movements of the lower ribs Spearman’s R = –0.260. Conclusions: Changing the position of the head causes disturbances in the three-dimensional shape of the chest and its respiratory movements.