Physical training has been shown to improve glucose tolerance and insulin action in peripheral tissues. In the present study, regular (R) and high (H) -dose euglycemic clamp procedures were performed to determine the effects of different types of physical training on insulin action (sensitivity/responsiveness) in 10 long-distance runners (LR), 10 weight-lifters (WL) and 12 healthy controls (HC), The amount of infused glucose (glucose metabolism, GM) during euglycemic clamping is a measure of the peripheral tissue sensitivity and/or responsiveness to insulin. For R clamping, when GM was calculated per unit body weight (BW), GM in LR (11.92±1.22 mg/kg BW·min) and WL (9.28±0.63 mg/kg BW·min) was significantly (P<0.05) higher than that in HC (7.44±0.39 mg/kg BW·min) . When calculated per unit lean body mass (LBM), LR (15.07±1.56 mg/kg LBM·min) differed from HC (9, 15±0.59 mg/kg LBM·min, P<0.05), whereas the value in WL (11.50±0.93mg/kg LBM·min) was identical to that in HC. For H clamping, there was no significant change in these three groups when GM was calculated per unit BW or LBM. These results suggest that enhancement of insulin action by physical training is due to an increase in insulin sensitivity, rather than to an increase in insulin responsiveness, and that aerobic exercise, for example long-distance running, is more effective for the improvement of decreased sensitivity to insulin, which is observed in patients with simple obesity and diabetes, than anaerobic exercise such as weight-lifting.

OBJECTIVETo investigate the relationship of cumulative fatigue symptoms among caregivers in Japan with work environment issues and lifestyle behaviors.

METHODSThe subjects were 376 women (mean age, 54 years) attending professional seminars for caregivers held between 1999 and 2002. After obtaining informed consent, a survey was conducted to ascertain work environment issues, lifestyle behaviors and fatigue levels. Fatigue was quantitatively assessed using the Cumulative Fatigue Symptoms Index (CFSI) developed by Kosugoh et al. Factors related to caregiver fatigue were identified using Pearson's correlation coefficient, the Mann-Whitney U-test and multiple regression analysis.

RESULTSCaregivers who felt an xiety or concern regarding care techniques, care content, personal relationships, work conditions, and physical fitness showed higher CFSI scores, while caregivers who exercised regularly and had proper eating behavior displayed lower CFSI scores. Anxiety/concern regarding physical fitness and proper eating behaviors were identified as significant predictors for all CFSI category scores (P<0.001). Regular exercise behavior (P<0.001), age (P<0.001), and years of work experience (P<0.001) also represented significant independent variables for some CFSI categories.

CONCLUSIONOur results suggest that upgrading the knowledge and skills of care and nursing and modifying lifestyle behaviors could reduce the level of fatigue experienced by caregivers.

OBJECTIVESThis study investigated the incidence of caries in infants and explored the risk factors related to noteworthy variations between urban and rural areas.

METHODSSubjects were 232 infants (111 males and 121 females) aged 1.6 and 3 years born in "N" town between the fiscal years of 1997 and 2001. Infants aged 1.6 and 3 years had 99.6 and 100% participation in health checkups, respectively. Of the total, 148 and 84 infants were living in the urban and rural areas, respectively, of "N" town.

RESULTSCaries incidence and the average number of carious teeth (decayed/missing/filled teeth, dmft) for infants aged 1.6 years were significantly higher in the rural area than in the urban area, indicating that environmental factors that predispose infants to develop dental caries exist in the rural area. In addition, logistic regression analysis for infants in each of the two areas revealed that risk factors of the child-care environment, for example living with grandparents and brushing by parents, stood in marked contrast with each other. Moreover, the odds ratio of the risk factor dozing off while drinking showed a marked difference between the areas, although this risk factor was common in both areas.

CONCLUSIONSThe results of this study indicated that several factors of the child-care environment, for example the daytime caring person, are related with caries development. Scientific elucidation of the risk factors that give rise to high prevalence of caries in specific regions and access to the whole picture of the disease mechanism may have great potential to lead to the development of effective countermeasures and to contribute to the reduction of dental caries in preschool children.