Time-frequency analysis of skeletal muscle and cardiac vibrations

Wood, J.C.; Barry, D. T.

doi:10.1109/5.535246

Cited by 45 publications

(26 citation statements)

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“…Since the ramp contractions generate the non-stationary MMG, time-frequency analysis is necessary. Wood and Barry (1996) used the Wigner transform for time-frequency analysis of the non-stationary MMG. The short-time Fourier transform was employed in this study because it is one of the simplest and most useful methods of time-frequency analysis, and is a generalization of traditional methods to nonstationary signals (Cohen 1995, Wood andBarry 1996).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanomyogram and force relationship during voluntary isometric ramp contractions of the biceps brachii muscle

Akataki¹,

Mita²,

Watakabe³

et al. 2001

European Journal of Applied Physiology

122

143

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The aim of the present study was to examine the non-stationary mechanomyogram (MMG) during voluntary isometric ramp contractions of the biceps brachii muscles using the short-time Fourier transform, and to obtain more detailed information on the motor unit (MU) activation strategy underlying in the continuous MMG/force relationship. The subjects were asked to exert ramp contractions from 5% to 80% of the maximal voluntary contraction (MVC) at a constant rate of 10% MVC/s. The root mean squared (RMS) amplitude of the MMG began to increase slowly at low levels of force, then there was a slight reduction between 12% and 20% MVC. After that, a progressive increase was followed by a decrease beyond 60% MVC. As to the mean power frequency (MPF), a relatively rapid increase up to 30% MVC was followed by a period of slow increment between 30% and 50% MVC. Then temporary reduction at around 50% MVC and a further rapid increase above 60% MVC was observed. The interaction between amplitude and MPF of the MMG in relation to the MU activation strategy is discussed for five force regions defined on the basis of their inflection points in the RMS-amplitude/force and MPF/force relationships. It was found that the MMG during ramp contractions enables deeper insights into the MU activation strategy than those determined during traditional separate contractions. In addition, this contraction protocol is useful not only to ensure higher force resolution in the MMG/force relationship, but also to markedly shorten the time taken for data acquisition and to reduce the risk of fatigue.

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Section: Discussionmentioning

confidence: 99%

“…In order to analyze the non-stationary MMG during ramp contractions, the short-time Fourier transform was used (Cohen 1995;Wood and Barry 1996). For a signal, f(t), the short-time Fourier transform is denoted by:…”

Section: Discussionmentioning

confidence: 99%

Mechanomyogram and force relationship during voluntary isometric ramp contractions of the biceps brachii muscle

Akataki¹,

Mita²,

Watakabe³

et al. 2001

European Journal of Applied Physiology

122

143

View full text Add to dashboard Cite

show abstract

“…However, some aspects of the TS need to be considered, such as their non-stationary behavior and the multicomponent nature [2,4]. Nowadays, one of the tendencies to analyze TS is based on obtaining signatures in the time-frequency (TF) domain.…”

Section: Introductionmentioning

confidence: 99%

Assessment of time–frequency representation techniques for thoracic sounds analysis

Reyes

Charleston-Villalobos

González-Camarena

2014

Computer Methods and Programs in Biomedicine

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“…However, as the ECG and all other biological signals belong to the family of multicomponent nonstationary signals [3], accurate time-varying spectral estimates can be extremely difficult to obtain. However, a proper time-frequency distribution (TFD) can tackle this problem and reveal the multicomponent nature of such signals.…”

Section: Introductionmentioning

confidence: 99%