PMID: 8971498Jan 1, 1996Paper

Relationship between reaction time of eye movement and activity of the neck extensors

European Journal of Applied Physiology and Occupational Physiology
Kenji Kunita, K Fujiwara

Abstract

This study investigated the relationship between the reaction time of eye movement (RTEM) and activity of the superficial neck extensor muscles when the shoulder girdle elevator muscles contracted isometrically. The results were compared with those of a previous study in which the subjects's head was fixed and loaded with the neck flexed. When the shoulder girdle elevator muscles contracted isometrically, RTEM decreased significantly in comparison to RTEM at rest. This demonstrated that the reaction time significantly decreased not only as a result of the neck in flexion, which activated the deep and superficial neck extensor muscles, but also from contraction of the shoulder girdle elevator muscles which mainly activated the superficial extensor muscles. The relationship between RTEM and relative muscle load of the shoulder girdle elevator muscles showed that RTEM decreased up to 30% loading, and with loading above 40% the RTEM was longer than with 30%. The relative muscle load for the shortest RTEM demonstrated a subject-to-subject variance ranging from 24.7% to 49.6%. The difference between RTEM at rest and at their shortest reaction time was approximately 20 ms, which was consistent with the data for the neck in flexion. Ho...Continue Reading

References

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Citations

Aug 31, 2010·European Journal of Applied Physiology·H O RichterM Forsman
Oct 4, 2006·Journal of Physiological Anthropology·Katsuo FujiwaraHidehito Tomita
Nov 20, 2009·The International Journal of Neuroscience·Katsuo FujiwaraNaoe Furune
Aug 22, 2000·Journal of Manipulative and Physiological Therapeutics·C G Davis
Apr 23, 2003·Perceptual and Motor Skills·Katsuo FujiwaraHiroshi Toyama

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