597 research outputs found
Biomechatronics: Harmonizing Mechatronic Systems with Human Beings
This eBook provides a comprehensive treatise on modern biomechatronic systems
centred around human applications. A particular emphasis is given to exoskeleton
designs for assistance and training with advanced interfaces in human-machine
interaction. Some of these designs are validated with experimental results which
the reader will find very informative as building-blocks for designing such systems.
This eBook will be ideally suited to those researching in biomechatronic area with
bio-feedback applications or those who are involved in high-end research on manmachine interfaces. This may also serve as a textbook for biomechatronic design
at post-graduate level
Whole body vibration: stimulus characteristics and acute neuromuscular responses
Whole body vibration (WBV) delivers a stimulus to the body via an oscillating
platform and remains a relatively new area of research. Several applications of
WBV stimuli have been developed as strength training and rehabilitation modalities,
but inconsistent results have been published. There is little knowledge underpinning
the mechanisms to explain the elicited neuromuscular responses to WBV and a wide
range of WBV parameters across the literature. As a result, safe and effective
protocols are yet to be established or validated. The aim of this current research was
to investigate: the electromyography (EMG) and explosive performance responses to
varying WBV frequencies; the effect of WBV data analysis techniques; and the
influence of external factors on WBV stimulus and neuromuscular responses. Three
main studies were completed:
1. An individualised response of both EMG and jump performance appears to
exist dependent on vertical WBV frequency, in trained participants. This is
in spite of no overall frequency dependent effect of EMG or performance
responses across participants as a group. The influence of the role of
expectancy effect appears minimal following this particular WBV protocol.
2. There was a significant effect of filter technique on EMG data recorded
during vertical WBV. A tailored, WBV specific notch filter technique may
offer an effective balance; excluding WBV noise artifacts without removing
significant portions of valuable muscle signal EMG data.
3. The influence of external load on WBV acceleration output also appears
minimal. Platform acceleration output was dependent on WBV frequency, as
expected. Lower accelerations were recorded in superior body segments,
suggesting a dampening mechanism, which was also proportionally
dependent on frequency. EMG activity of upper and lower leg segments may
differ in response to frequency, likely due to transmission distances involved.
This may partially account for a potential dampening mechanism.
In addition, a protocol to quantify WBV stimuli delivered by this particular WBV
type illustrated significant differences in theoretical and actual parameters. This may
explain not only the lack of overall explosive performance effect reported earlier; but
also the inconsistent WBV literature. Future research should quantify WBV stimulus
before investigating possible neuromuscular responses to individualised protocols,
which may be assessed via EMG activity
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