Head-down Posture
Head-down Posture - Related Videos
09:34
Flyback Converter
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. A flyback converter is a buck-boost converter, which can both buck and boost. It has electrical isolation between the input and the output using a coupled inductor or a "flyback transformer." This coupled inductor enables a turns ratio that provides both voltage step-up and step-down capability, like in a regular transformer but with energy storage using the air-gap of the coupled inductor. The...
12:18
DC/DC Boost Converter
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. Boost converters provide a versatile solution to stepping up DC voltages in many applications where a DC voltage needs to be increased without the need to convert it to AC, using a transformer, and then rectifying the transformer output. Boost converters are step-up converters that use an inductor as an energy storage device that supports the output with additional energy in addition to the DC input...
10:26
DC/DC Buck Converter
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. While it is simple to step up or down AC voltages and currents using transformers, stepping up or down DC voltages and currents in an efficient and regulated manner requires switching power converters. The DC/DC buck converter chops the input DC voltage using a series input switch, and the chopped voltage is filtered through the L-C low-pass filter to extract the average output voltage. The diode...
06:21
Postural Organization of Gait Initiation for Biomechanical Analysis Using Force Platform Recordings
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Cited by 3 •
2022
This paper describes the material and method developed to investigate the postural organization of gait initiation. The method is based on force platform recordings and on the direct principle of mechanics to compute center of gravity and center of pressure kinematics.
09:37
Substantiating Appropriate Motion Capture Techniques for the Assessment of Nordic Walking Gait and Posture in Older Adults
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Cited by 5 •
2016
The aim was to substantiate optimal use of data collection techniques for Nordic walking gait and posture analysis. Three-dimensional motion capture should be used during short duration analysis (i.e. single gait cycle), while accelerometry should be employed for longer duration analysis (i.e. repeated cycles) like a 6 Minute Walk Test.
FAQs
The posture increases venous pressure in the upper body, which can alter pressure conditions affecting the brain. These changes may influence intracranial pressure, the pressure within the skull, and cerebral blood flow, meaning the movement of blood through brain tissue. Studying both responses helps researchers examine how fluid redistribution affects neural function and cerebral circulation.
Changing body orientation modifies the balance-related sensory information received by the vestibular system. The brain must interpret these altered signals alongside cardiovascular and pressure changes, which can affect studies of orientation and postural regulation. This makes the posture useful for separating responses linked to vestibular input from those caused by fluid redistribution or cardiovascular stress.
Autonomic regulation helps coordinate the body's response to altered blood distribution and cardiovascular stress. Head-down positioning provides a controlled challenge for examining how the nervous system adjusts to these changes, particularly in relation to orthostatic regulation. The resulting observations can clarify how neural control mechanisms contribute to maintaining stable circulation when pressure and body orientation change.
Researchers use head-down positioning as an experimental condition that changes pressure and sensory inputs before examining nervous-system responses. Comparing those responses with the body's regulation of posture-related cardiovascular stress can reveal mechanisms involved in orthostatic control. This approach connects altered fluid distribution with the neural processes responsible for adapting to changes in body position.
Spaceflight-related adaptation is one important context for this approach because altered fluid distribution can challenge systems that normally respond to gravity and body orientation. Studying head-down positioning helps researchers investigate how cerebral, vestibular, and autonomic responses interact under such conditions. The findings may clarify mechanisms that contribute to nervous-system adaptation during spaceflight.
The approach can support investigations of cerebral function, vestibular function, and cardiovascular regulation when pressure and sensory conditions change together. It is especially relevant to questions about how the brain responds to altered fluid distribution and balance-related input. Researchers can also use it to examine mechanisms associated with disorders involving cerebral or vestibular function.