The origins of physiological tremor as deduced from immersions of the finger in various liquids
Abstract
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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Using the PSD of tremor to quantify tremor intensity can improve sensitivity for motor performance evaluation compared with UPDRS scores.
“We demonstrate here that the use of PSD of tremor to quantify tremor intensity [20, 45] can improve its sensitivity for motor performance evaluation.”
From Evaluation of tremor interference with control of voluntary reaching movements in patients with Parkinson's disease (2019) · cites this paper as [45]
Cites
The effects of load and force on tremor at the normal human elbow joint
Joyce, G. C., & Rack, P. M. H. (1974) · The Journal of Physiology · doi:10.1113/jphysiol.1974.sp010615 · Cited by 167 · see citing works
Homberg, V, Hefter, H., Reiners, K., & Freund, H. J. (1987) · Journal of Neurology, Neurosurgery & Psychiatry · doi:10.1136/jnnp.50.5.568 · Cited by 147 · cited 3× · see citing works
“Various researchers have attempted to verify this hypothesis by experiments which have increased the load on the limb segment (Joyce and Rack 1974; Lakie et al. 1986; Hömberg et al. 1987; Sakamoto et al. 1993; Arihara and Sakamoto 1999a).”
BackgroundComparison of electromyogram spectra with force spectra during human elbow tremor.
Matthews, P. B., & Muir, R. B. (1980) · The Journal of Physiology · doi:10.1113/jphysiol.1980.sp013254 · Cited by 70 · see citing works
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Hu, Z., Hao, M., Xu, S., Xiao, Q., & Lan, N. (2019) · Journal of NeuroEngineering and Rehabilitation · doi:10.1186/s12984-019-0505-0 · Cited by 38 · see citing works
Biomechanical loading as an alternative treatment for tremor: a review of two approaches
Rocon, E., Gallego, J. Á., Belda-Lois, J. M., Benito-León, J., & Pons, J. L. (2012) · Tremor and Other Hyperkinetic Movements · doi:10.5334/tohm.107 · Cited by 26 · see citing works
Hossen, A., Deuschl, G., Groppa, S., Heute, U., & Muthuraman, M. (2020) · Technology and Health Care · doi:10.3233/thc-191947 · Cited by 18 · see citing works
- Authors
- Takanokura, M., Kokuzawa, N., & Sakamoto, K.
- Affiliations
- Kanagawa University (JP)
- University of Electro-Communications (JP)
- Corresponding author
- Takanokura, Masato
- ORCID
- Takanokura, Masato
- Venue
- European Journal of Applied Physiology
- Published
- 2002-11-01
- Volume
- 88
- Issue
- 1-2
- Pages
- 29-41
- ISSN
- 0020-9376 (ISSN-L)
- 1439-6319
- OpenAlex
- W2058818401
- Cited by
- 18
- References
- 3
- Citations by year
- 2025: 1 · 2020: 1 · 2019: 1 · 2015: 1 · 2014: 2 · 2012: 3
- FWCI
- 0.00
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- European Journal of Applied Physiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
- Physical Sciences › Engineering › Biomedical Engineering › Muscle activation and electromyography studies
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Effects of Vibration on Health
- Keywords
- physiological tremor, liquid viscosity, liquid density, buoyancy, stretch reflex, supraspinal control, neuromuscular function, gravity
- MeSH terms
- Acceleration, Adult, Computer Simulation, Fingers, Gravitation, Humans, Immersion, Male, Models, Biological, Tremor, Viscosity
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