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Evaluation of the postural stability in man: movement and posture interaction

100%
Blaszczyk J. W., Hansen P. D., Lowe D. L.
Acta Neurobiologiae Experimentalis
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1993
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vol. 53
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issue 1
155-160
EN
The stability of upright posture was evaluated in 13 young and 13 elderly subjects by measuring the amplitude of centre of foot pressure (COFP) excursion in the anteroposterior and mediolateral directions while performing voluntary motor tasks requiring precise center of gravity control i.e., circular and forward-backward sways, squatting and rising on toes. The elderly subjects exhibited a significantly smaller COFP excursion than the young in the circular and forward-backward sways and a nonsignificant reduction in the COFP progression in the rise on toes and squatting tasks. The data document significant reorganization of the motor program execution due to decline in the postural stability in old adults.
2

Satellite association frequency in persons with goiter

88%
Ferenc T., Bratkowska W., Maziarz Z., Gaszynska M.
Genetica Polonica
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1994
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vol. 35
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issue 4
333-344
EN
The work was carried out to estimate satellite association (SA) frequency of acrocentric chromosomes in male and female persons with goiter at a normal, increased and decreased concentrations of thyroid hormones with relation to meiotic or mitotic nondisjunction.Satelite associations were estimated on the methaphase plates obtained through macroculture of peripheral blood limphocytes.The concentration of triiodothyronine (T3) and thyroxine (T4) was determined by the method of radioimmunological analysis (RIA).
3
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Age-related differences in performance of stereotype arm movements: movement and posture interaction

88%
Błaszczyk J. W., Lowe D. L., Hansen P. D.
Acta Neurobiologiae Experimentalis
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1997
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vol. 57
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issue 1
49-57
EN
Postural destabilizations in response to cyclic pull and push arm movements were compared in young and elderly subjects, with the goal of determining how age related differences in postural stability influence strategies of cyclic arm movements made at different speeds, against different loads and while standing on support surfaces of different compliances. The results show that elderly subjects performed the experimental task more slowly with a lower mean movement frequency and a smaller amplitude. Despite of this fact, the elderly's upright posture was destabilized by this movement to a greater extent than in young subjects. The older adults exhibited lower damping of the disturbing torques produced by arm movements as evidenced by a higher amplitude of the center of foot pressure excursions. The results document close reciprocal motor and posture interaction and indicate that parameters of the voluntary movement task such as cyclic arm movements might be used as a sensitive measure of postural stability.
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