ABSTRACT
The primary aim of this study was to examine moderate-to-vigorous physical activity (MVPA) levels in preschool children during indoor and outdoor free playing time and during preschool physical education (PE) classes. The secondary aim was to determine which types of PE lessons are the best for increasing the percentage of MVPA. Physical activity during free playing time and in lessons was objectively evaluated with a triaxial accelerometer in preschool boys and girls (n = 281). Minutes of physical activity were categorized into physical activity ratios (PAR). MVPA was defined as PAR ≥3.0. Time tables and PE lesson types were recorded using logs kept by class teachers. The percentage of MVPA in outdoor free playing time (38.9±16.3%) was significantly higher than that of indoor free playing time (12.6±10.1%, p<0.001). On the other hand, there was no significant difference between the percentage in MVPA in outdoor free playing time and the percentage in PE lessons (n=94: 38.0±19.4%vs. 34.9±15.8%, ns). After adjustment for gender, age, body height and weight and preschool, there were not significantly different the percentage of MVPA among contents of PE lessons. In conclusion, children engaged in almost 30~40% MVPA during outdoor free playing time or PE. The children also engaged MVPA during indoor free playing time.
ABSTRACT
This study sought to examine the potential relationships of physical education (PE) participation at preschool and sports club (SC) participation out of school and daily physical activity (PA) measured objectively using a triaxial accelerometer, with physical fitness in preschool children. Physical fitness testing was used to measure both health-related and skill-related parameters of fitness in 191 Japanese preschoolers in the Kanto region (94 boys and 97 girls, 5.6 ± 0.6 years). Daily PA was assessed using a triaxial accelerometer (ActivTracer, GMS) for 6 consecutive days, including weekdays and weekend days. PE and SC participation was assessed using questionnaires for preschool teachers or parents of subjects, respectively. All health-related and skill-related physical fitness and total Z-score were correlated with time spent with physical activity ratio (PAR)≧4 when adjusted for age, sex, body height and weight. In addition, greater grip strength was associated with PE participation at preschool, and 25 m run speed was associated with SC participation, also. However, 25 m run speed was negatively associated with PE participation. These findings suggest that daily PA may contribute to the development of both health-related and skill-related fitness in preschool children, although further research on the cause-effect relationship is needed. Moreover, participation in a SC may contribute to the development of running speed.
ABSTRACT
PORPOSE: This study aimed to compare the prevalence of metabolic syndrome (MS) risk factors and its components in different levels of aerobic fitness established by “Exercise and Physical Activity Reference for Health Promotion 2006 (EPAR2006)” in Japanese middle-aged and elderly people.METHOD: Men (n=102) and women (n=133), aged 30-69yrs, participated in this study. The prevalence of MS risk factors was evaluated as the number of MS risk factors, according to the diagnostic criterion for Japanese-specific MS. Aerobic fitness was quantified as maximal oxygen uptake (VO<sub>2</sub>max). Subjects were classified into the three groups by aerobic fitness level based on “Reference values” and “Reference range” established in EPAR2006; 1) High fitness group (H); VO<sub>2</sub>max (mL/kg/min) is higher than “Reference values”, 2) Medium fitness group (M); VO<sub>2</sub>max is below “Reference values” but within “Reference range”, 3) Low fitness group (L); VO<sub>2</sub>max is lower than “Reference range”.RESULTS: In men, M and L groups showed significantly higher frequency of risk factors for MS than H group (H: 1.09±0.98, M: 1.81±1.07, L: 2.27±0.70, P＜0.01). In women, L group showed significantly higher frequency of risk factors for MS than H and M groups (H: 0.57±0.80, M: 0.81±1.01, L: 1.53±1.07, P＜0.01).CONCLUSION: These results suggest that higher MS risk appears when the VO<sub>2</sub>max is lower than “Reference values” in men, and below “Reference range” in women, and that particularly, men with low aerobic fitness have higher MS risk.
ABSTRACT
Athletes have been instructed to refrain from taking carbonated beverages in the sports world, but the mechanism has not been clear. The purpose of this study was to clarify how physiological and biochemical evaluation are affected by taking a 10% CHO carbonated beverage after cycle ergometer (60 min, 60% VO<sub>2</sub>max). Seven subjects consumed a carbonated or noncarbonated (10% carbohydrate) beverage after exercise. No differences were observed in concentration of glucose, insulin, free fatty acids, K and Na in serum from carbonated beverage compared with noncarbonated beverage intakes after exercise.These results indicate that carbonated beverage did not affect the changes of physiological and biochemical parameter after prolonged exercise, and it could be more refreshing and stimulate taste rather than noncarbonated beverage, but seemed to be hard to drink immediately after exercise because it made subjects feel as if having drunk more than they did.
ABSTRACT
The basal metabolic rate (BMR) of 70 postmenopausal women (age: 60.6±4.2 yrs., height: 154.9±5.2cm, body weight (BW) : 52.7±6.2kg; mean ±SD) was evaluated in relation to body composition (body fat mass (FM) : 17.3±3.9kg, lean body mass (LBM) : 35.3±3.6kg) . BMR was 1, 148±126kcal/day, 21.9±2.2kcal/kgBW/day, 32.7±3.2kcal kgLBM/day in all subjects. BMR (kcal/day) significantly correlated with BW (r=.635, p<0.001) and LBM (r=.598, p<0.001) . When divided into two groups, (lower %fat group (LF; <35%fat) and higher %fat group (HF; ≥35%fat) ), BW and FM were significantly higher in HF than in LF (BW: 56.6±6.4 vs 51.0±5.3 kg, FM: 21.7±2.8 vs 15.5±2.7 kg, p<0.001, respectively) . No difference was observed in LBM between the two groups (34.9±3.9 vs 35.5±3.5 kg) . BMR (kcal/kgBW/day) was lower in HF than in LF (21.0±1.8 vs 22.3±2.3, p<0.05), but HF group had higher BMR in terms of kcal/kgLBM/ day than LF (34.0±3.1 vs 32.1±3.1, p<0.05) . Multiple regression analysis was performed to predict BMR. A single predictor LBM and a pair of predictors LBM and FM explained 35.7% and 42.7% of the variance of BMR. This study suggested that a decrease in LBM is a major factor in affecting the reduction of BMR in postmenopausal women, whereas FM gained after menopause could be considered to have metabolic activity related to BMR.