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Seasonal differences in red blood cell parameters were examined in rural villagers of Nepal. People in this region exhibit considerable variation in amounts of physical activity performed and food co...nsumed through the year due to seasonal rainy and dry periods. Twenty-one adult men and nine adult women participated in this investigation in February (the farmer's slack season), July and October (the busiest season for farmers) of 1998 and in March (the farmer's slack season) of 1999. One-way repeated measures ANOVA exhibited significant season main effects for body weight, red blood cell count (RBC), Hemoglobin (Hb) and Hematocrit (Ht) for male and female subjects. Body weight decreased significantly from February to July (-1.2kg (2.6%)) and October (-1.4kg (2.8%)) in men. The women showed a decrease of 1.2kg (2.9%) and 1.0kg (2.4%) from February to July and February to October, respectively. Body weight was recovered for both men and women at March in the next year. In July and October, RBC, Hb and Ht decreased to about 90% of the levels exhibited in February. Moreover, 40% of the men and 30% of the women showed unusual values of mean corpuscular volume in July and October. There were many subjects that exhibited lower values than normal of Hb, while there were few subjects that showed lower values than normal of RBC. Every red cell parameter had returned to normal at March of the following year. These findings in which both weight and red blood cell parameters changed are attributed to the seasonal increase in the amount of physical activity and the disturbance in the food situation in the busiest season for farmers.続きを見る
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