These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Developmental trends of jumping reaction time by means of EMG in mentally retarded children.
    Author: Yabe K, Tsukahara R, Mita K, Aoki H.
    Journal: J Ment Defic Res; 1985 Jun; 29 ( Pt 2)():137-45. PubMed ID: 4032463.
    Abstract:
    Developmental trends of jumping reaction time (RT) in mentally retarded children were studied cross-sectionally. Fifty-three boys, ranging in CA from 7 to 18 years, took part in the jumping RT task. RT measurements were obtained from EMG of an agonist muscle (rectus femoris). There was a significant decrease in RT with increasing CA. Correlation between RT and MA was highly significant, but discontinuity in the distribution was found between MA of 6 and 7 years. The subjects with a MA below 6 were characterized by large variability as well as slowness in RT. RT was not correlated with CA holding MA constant among the subjects with a MA below 6. The subjects with a MA above 7 showed relatively small variability within and between subjects. RT in subjects with a MA above 7 decreased with CA holding MA constant but RIV showed no change. RT in children with a very low MA is prolonged by inefficiency which reflects difficulty in maintaining attention or arousal level. The efficiency in information processing may change between the MAs of 6 and 7 years.
    [Abstract] [Full Text] [Related] [New Search]