Study of function of fingers by physiological tremor

Sakamoto, Kazuyoshi; Itakura, Naoaki; Nishida, Kohji; Zhou, Li

doi:10.1016/0306-4565(93)90110-f

Cited by 8 publications

(16 citation statements)

References 6 publications

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“…in the absence of liquid) are shown 18 Hz to 50 Hz. The second index was the spectrum ratio in the low frequency range (Sakamoto et al 1993). This was calculated as the ratio of the total power in the low frequency domain from 0.5 Hz to 18 Hz to the total power in all the frequency domains between 0.5 Hz and 50 Hz:…”

Section: Discussionmentioning

confidence: 99%

“…These hypotheses have been verified by experiments in which surface electromyogram (EMG) was measured during tremor (Elble and Randall 1978;Matthews and Muir which an external weight or an elastic spring has been applied to the limb segment. When holding an external weight, the amplitude of tremor has been observed to increase (Sakamoto et al 1993;Arihara and Sakamoto 1999a), and a lowering of the frequency of tremor has been observed (Joyce and Rack 1974;Lakie et al 1986;Ho¨mberg et al 1987). The opposite condition, i.e.…”

Section: Introductionmentioning

confidence: 93%

“…This result indicated that the reduction of the contraction force occurred in the muscle. To account for the effect of buoyancy, the force holding the finger in a stretched position was reduced by the buoyancy due to the liquid because the buoyancy acted on the finger in the direction opposite to gravity (Sakamoto et al 1993). It was assumed that the effect of the viscosity was to make the value of T 0 decrease, because a larger resistance force would have been added to the finger in (Freq-2).…”

Section: Choice Of Parametermentioning

confidence: 99%

“…The magnitude of the viscosity is determined by the velocity of the movement of the object as well as by the coefficient of viscosity of the liquid. Sakamoto et al (1993) and Miao and Sakamoto (1995) did not discuss whether tremor changed due to the viscosity of water. They postulated that the viscosity had little effect on tremor because of the low value of the coefficient of viscosity of water.…”

Section: Introductionmentioning

confidence: 96%

“…They, however, did not discuss any possible contribution of the nervous system to tremor. A similar environment was accomplished by an experiment immersing a limb segment in water (Sakamoto et al 1993;Miao and Sakamoto 1995). When the limb segment is immersed in water, the effects of gravity on the limb segment are opposed by the buoyancy, i.e.…”

Section: Introductionmentioning

confidence: 99%

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The origins of physiological tremor as deduced from immersions of the finger in various liquids

Takanokura

Kokuzawa

Sakamoto

2002

European Journal of Applied Physiology

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To investigate the influence of gravity on physiological tremor during a holding stretch of the finger, tremor during immersion of the finger in liquids was measured. Liquids with various densities and various coefficients of viscosity were used. Tremor was detected using an acceleration sensor, and power spectrum analysis was performed on the acceleration signal of the tremor. The total power of the tremor spectrum decreased with an increase of the density and an increase of the coefficient of viscosity, the high frequency domain of the tremor spectrum showing a larger decrease than the low frequency domain. Linear regression analysis showed that the viscosity of the liquid had a larger effect on tremor than the buoyancy due to the liquid. A model was proposed for tremor during immersion of the finger in liquid. The effect of the buoyancy and the viscosity on tremor was examined using the proposed model. The origin of two frequency bands in the tremor spectrum was verified by both the immersion experiment and the proposed model. The stretch-reflex system via the spinal cord produced a high frequency band around 25 Hz, while the supraspinal system caused a low frequency band around 10 Hz. The neuromuscular function of the human body was evaluated using the amplitude and the frequency of tremor.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Section: Choice Of Parametermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The origins of physiological tremor as deduced from immersions of the finger in various liquids

Takanokura

Kokuzawa

Sakamoto

2002

European Journal of Applied Physiology

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Physiological tremor of the upper limb segments

Takanokura

Sakamoto

2001

European Journal of Applied Physiology

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The acceleration signal produced by physiological tremor from four different upper limb segments (the finger, hand, forearm and upper limb) was measured by an acceleration sensor during holding posture and was analyzed by power spectrum analysis. Two prominent peaks appeared in the power spectrum, suggesting that the tremor in the four different limb segments was composed of two frequency components. The frequency of one peak at 8-12 Hz did not change between the different limb segments, while the frequency of the other peak decreased with the increase in the mass of the limb segment. A model with two reflex pathways was developed for the tremor in the four limb segments. The model includes two reflex pathways, a spinal pathway and a supraspinal pathway. The theoretical values of the frequency and the amplitude of the tremor predicted by the model were in good agreement with the experimental results. Analysis of the model revealed that one of the two frequency components of the tremor was of spinal origin and was dependent upon the mass of the limb segment, and the second was of supraspinal origin, corresponding to the frequency at 8-12 Hz. In the normal subject, it is possible that the tremor could be used to evaluate the change in neuromuscular function produced by prolonged work involving just part of a limb segments (e.g., typing). It may also be used to evaluate the neuromuscular function of patients suffering from neurological diseases such as muscular dystrophy and Parkinson's disease.

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On Using Controller Input and Signal Processing as a Parameter for Learning in CPHS

John¹,

Reid²

2022

IFAC-PapersOnLine

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Study of function of fingers by physiological tremor

Cited by 8 publications

References 6 publications

The origins of physiological tremor as deduced from immersions of the finger in various liquids

The origins of physiological tremor as deduced from immersions of the finger in various liquids

Physiological tremor of the upper limb segments

On Using Controller Input and Signal Processing as a Parameter for Learning in CPHS

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