The effects of unilateral forced nostril breathing (UFNB) on systolic and diastolic blood pressures and heart rate (HR) were studied in 88 male and 41 female right-handed subjects. In men, both the right and left unilateral forced nostril breathings significantly increased the systolic blood pressure (SBP) and HR, but had no effect on the diastolic blood pressure (DBP). In women, the right UFNB increased, but the left UFNB slightly decreased the SBP and DBP. The results suggested that there may be a nostril laterality affecting the autonomous nervous system differentially.
Rates of left-handedness were compared in 1387 blind and 831 sighted children. The rate in male blind children was higher than in female blind children. The incidence of left-handedness was significantly higher in blind than in sighted children in both boys and girls. The percentages of left-handedness were 18.23% and 17.02% in male and female blind children, and 11.02% and 7.52% in male and female sighted children, respectively. It can be stated that sighting is important in the development of normal typical cerebral lateralisation or hand preference.
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