AGED CHANGES OF DYNAMIC COMPONENT OF THE VERTICAL STABILITY IN WOMEN 60-74 YEARS OLD

В статье представлена характеристика динамического компонента постурального баланса и выявлены его особенности у женщин пожилого возраста с постуральным дефицитом. Оценку динамического компонента постурального баланса проводили на компьютерном стабилометрическом комплексе «Balance Manager» у женщин 60-74 лет с падениями в анамнезе и без них. При постуральном дефиците наиболее значимые изменения проявляются в увеличении времени реализации и снижении эффективности выполнения сложных двигательных актов. В факторной структуре показателей динамического компонента постурального баланса при постуральном дефиците ведущим является фактор, характеризующий скоростные и силовые показатели при реализации сложных двигательных актов. Исследование динамического компонента постурального баланса рекомендуется включать в комплексную диагностику нарушений ходьбы у лиц пожилого возраста и при оценке эффективности лечебных и реабилитационных мер. The article presents characteristics of the dynamic component of postural balance and its features in elderly women with postural deficit. The assessment of the dynamic component of postural balance was performed on a computer stabilometric complex «Balance Manager» in women aged 60-74 with and without a history of falls. The most significant changes are manifested by an increase in the time of implementation and a decrease in the effectiveness of performing complex motor acts. In the factor structure of indicators of the dynamic component of postural balance in postural deficit, the leading factor is the factor that characterizes speed and power indicators in the implementation of complex motor acts. The study of the dynamic component of postural balance is recommended to be included in the comprehensive diagnosis of walking disorders in the elderly and in evaluating the effectiveness of treatment and rehabilitation measures.

Modulations in vertical stability trigger intraseasonal variations in phytoplankton bloom

<p>Seasonal surface chlorophyll (SChl) blooms are very chaotic in nature, but traditional bloom paradigms have climbed out of these intraseasonal/subseasonal variations. Here we quantify these intraseasonal fluctuations and explore the links between the surface bloom and vertical stability at intraseasonal timescales, along the spring bloom region of the northwestern Mediterranean Sea. We use 8-day merged ocean color SChl product distributed by the European Space Agency Ocean Color Climate Change Initiative (ESA OC-CCI), in situ data from the long-term time series BOUSSOLE, wind stress and heat flux from ERA-Interim reanalysis. The 8-day SChl product from ESA OC-CCI has excellent data coverage in the northwestern Mediterranean Sea. Comparison with the high frequency in situ data from the BOUSSOLE mooring shows that the satellite and in situ SChl products are reliable at the subseasonal timescale. Our results reveal that intraseasonal variability explains nearly half of the SChl variability in the bloom region and occur at smaller spatial scales (~100 km). We demonstrate that weekly SChl fluctuations are in phase with weekly changes in wind stress and net heat flux during the initial state of the bloom in winter and early spring, thus expanding the convection shutdown hypothesis of bloom onset to subseasonal timescales. We postulate that intermittency in vertical stability due to short-term episodes of calm weather in winter or to stormy conditions in early spring leads to short-term variations in light exposure or to events of vertical dilution, and to strong intermittency in phytoplankton bloom.</p>

Intermittency in phytoplankton bloom triggered by modulations in vertical stability

Seasonal surface chlorophyll (SChl) blooms are very chaotic in nature, but traditional bloom paradigms have climbed out of these subseasonal variations. Here we highlight the leading order role of wind bursts, by conjoining two decades of satellite SChl with atmospheric reanalysis in the Northwestern Mediterranean Sea. We demonstrate that weekly SChl fluctuations are in phase with weekly changes in wind stress and net heat flux during the intial state of the bloom in winter and early spring, thus expanding the convection shutdown hypothesis of bloom onset to subseasonal timescales. We postulate that the mechanism reflected by this link is intermittency in vertical stability due to short-term episodes of calm weather in winter or to stormy conditions in early spring, leading to short-term variations in light exposure or to events of vertical dilution. This strong intermittency in phytoplankton bloom may probably have important consequences on carbon export and trophic web structure and should not be overlooked.