Landscape Tension Index

2015 ◽  
pp. 171-188
Author(s):  
Brian Lee ◽  
James Adams ◽  
Stephen Austin
Keyword(s):  
Tension Index

scholarly journals The typology of mechanisms of adaptation to the cognitive load on the variability of heart rate dynamics

2018 ◽  
Vol 11 (3) ◽  
pp. 78-93
Author(s):  
I.G. Bodrov ◽  
A.Yu. Shishelova
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Cognitive Load ◽  
Tension Index ◽  
Higher Power ◽  
Heart Rate Dynamics ◽  
Sensory Motor ◽  
Mechanisms Of Adaptation ◽  
Cognitive Activities ◽  
Regulatory Effects

While analyzing heart rate variability there were detected two types of visceral adaptation to cognitive activities: the first one is characterized by decrease of tension index (Baevskiy, 1984) and increase of heart rate variability at a cognitive load, along with increased power of regulatory effects on the heart rate; the second one is defined by higher heart rate variability, higher power of regulatory effects before the cognitive load and increase of the strain index during cognitive load in the absence of other significant changes. It is peculiar for people related to these types to possess different correlation relationships between the indices of sensory-motor reactions and heart rate variability.

HEART RATE VARIABILITY IN WOODWORKING MACHINIST TRAINEES DURING WORKSHOP PRACTICE

2020 ◽  
pp. 135-141
Author(s):  
O.V. Kiyok ◽  
V.M. Pokrovskiy
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Adaptive Capacity ◽  
Regulatory System ◽  
Study Groups ◽  
Total Power ◽  
Tension Index ◽  
Workshop Practice ◽  
Adverse Influence ◽  
The Impact

The impact of specific factors on students during workshop practice results in tension of regulatory and adaptive mechanisms. This fact can be estimated according to the heart rate variability (HRV). It is of the integral indicators reflecting all mechanisms of cardiac regulation. The aim of the study is to assess students’ adaptive capacity during workshop training based on HRV. Materials and Methods. The authors divided 30 students into two groups: a group of less adapted and a group of more adapted students. J. Strelau’s theory on temperament and H. Eysenck's personality types were used for the purpose. The authors studied heart rate variability at the beginning and at the end of workshop practice. Statistika 6.0 for Windows was used to process the results. Results. The authors distinguished differences in HRV in two study groups. Before practice, the regulatory system tension index was 479.64 in the group of less adapted students. It was 106.86 in the group of more adapted students. The total power (ms2) indicating adaptive capacity was by 80.9 % higher in more adapted students. After workshop practice, changes in the tonus of the autonomic nervous system were observed in both study groups. However, in the group of less adapted students, indicators confirming sympathicotonia and a decrease in heart rate variability changed to a greater degree. Thus, tension index in the group of more adapted students increased by 46.7 %, and in the group of less adapted students – by 209.9 %. The authors also observed a decrease in the total power: in more adapted students by 51.3 %, and in the less adapted students by 54.3 %. Results. Analysis of HRV showed a more evident adverse influence of workshop practice on less adapted students. Keywords: students, workshop practice, heart rate variability. Воздействие специфических факторов на учащихся при прохождении производственной практики приводит к напряжению регуляторно-адаптивных механизмов, что можно оценить по вариабельности ритма сердца (ВРС) – одному из интегральных показателей, отражающих механизмы сердечной регуляции на всех уровнях. Цель исследования. Оценить адаптивные возможности учащихся при прохождении производственной практики по показателям ВРС. Материалы и методы. У 33 учащихся, разделенных согласно теории Я. Стреляу и в соответствии с психологическими типами личности по Айзенку на группы менее адаптированных и более адаптированных, изучили вариабельность ритма сердца в начале и конце производственной практики. Для обработки результатов исследования применяли программу Statistika 6,0 for Windows. Результаты. Установлены различия ВРС в двух исследуемых группах. До практики индекс напряжения регуляторных систем (ИН) в группе менее адаптированных составил 479,64, в группе более адаптированных учащихся – 106,86. Общая мощность спектра ТР (мс2), свидетельствующая об адаптивных возможностях, у более адаптированных учащихся была выше на 80,9 %. После производственной практики изменения тонуса вегетативной нервной системы отмечены в обеих исследуемых группах. Однако в группе менее адаптированных учащихся показатели, свидетельствующие о симпатикотонии и уменьшении вариабельности ритма сердца, изменились в большей степени. Так, ИН в группе более адаптированных учащихся увеличился на 46,7 %, а в группе менее адаптированных – на 209,9 %. Отмечено уменьшение общей мощности спектра: у более адаптированных на 51,3 %, у менее адаптированных на 54,3 %. Выводы. На основании анализа ВРС показано более выраженное неблагоприятное влияние производственной практики на менее адаптированных учащихся. Ключевые слова: учащиеся, производственная практика, вариабельность ритма сердца.

Tension Index

1971 ◽  
Author(s):  
Thomas F. Lyons
Keyword(s):  
Tension Index

Study on Box Girder Damage Identification of Cable-Stayed Bridges

2011 ◽  
Vol 101-102 ◽  
pp. 1156-1160
Author(s):  
Hua Wei Zhu ◽  
Hong Mou Wang ◽  
Wei Peng
Keyword(s):  
Damage Identification ◽  
Stress Index ◽  
Bending Stress ◽  
Box Girder ◽  
Cable Tension ◽  
Flexibility Matrix ◽  
Tension Index ◽  
Modal Flexibility ◽  
Curvature Index ◽  
Modal Curvature

A comparative study of the girder damage identification of Jintang Cable-stayed Bridge in Zhoushan Island-Land Project using the deflection index, the cable tension index, the beam bottom bending stress index, the modal curvature index and the modal flexibility matrix is introduced. By means of finite element method, a series of damage cases associated with the box girder are analyzed. The result shows that, for different damage types, the best effect of the girder damage identification is the modal curvature index, followed by the cable tension index, the beam bottom bending stress index is nearly of the same effect as the modal flexibility matrix index, and the worst is the deflection index.

Prediction of changing cerebral blood flow by use of the conjunctival oxygen tension/arterial oxygen tension index

1989 ◽  
Vol 17 (12) ◽  
pp. 1328-1332 ◽  
Author(s):  
WILLIAM F. RUTHERFORD ◽  
EDWARD A. PANACEK ◽  
J. KEYEN GRIFFITH ◽  
JEFFREY A. GREEN ◽  
MARK MUNGER ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Oxygen Tension ◽  
Arterial Oxygen Tension ◽  
Arterial Oxygen ◽  
Tension Index ◽  
Conjunctival Oxygen Tension
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