Effects of pre-exercise mineral-containing supplemention on oxidative stress markers, carbohydrate and lipid metabolism / 体力科学

Little is known regarding the effects of mineral-containing supplemention on oxidative stress markers, carbohydrate and lipid metabolism in response to an acute bout of exercise in humans. The present study investigated whether prior mineral-containing supplemention can improve oxidative stress status and how this supplementation influences on carbohydrate and lipid metabolism after a single bout of cycling in young men. Twelve, healthy young men (aged 22.5 ± 2.4 years, mean ± SD) underwent two, 150-min trials in a random order. Each participant received oral administration of mineral supplement containing 13.4 mg of sulphur or placebo one minute before exercise. In both trials, participants cycled at 75% of heart rate reserve for 60 minutes and then rested for 90 minutes. Blood samples were collected pre-exercise supplementation, immediately after exercise, 30 minutes after exercise, 60 minutes after exercise and 90 minutes after exercise. Circulating concentrations of derivatives of reactive oxygen metabolites, biological antioxidant potential, glucose and insulin did not differ between trials. Elevated circulating concentrations of non-esterified fatty acids were observed immediately after exercise in the supplementation trial compared with the placebo trial (mean ± SD: 1.1 ± 0.5 and 0.9 ± 0.3 mmol/L, respectively: trial × time interaction, p = 0.036). The present study showed that acute mineral-containing antioxidant supplemention appears to have no effect on improving oxidative stress markers in response to a single bout of cycling in healthy young men. In addition, the findings of this study suggested that mineral-containing supplemention may influence lipids metabolism during exercise.

The associations between physical fitness and body fatness with blood lipid profile in Japanese children and adolescents / 体力科学

<p>The purpose of the present study was to examine the associations between physical fitness and body fatness with blood lipid profile in 231 Japanese children and adolescents (12.1 ± 1.5 years). The primary outcomes of the present study were a lipid risk score which was calculated by summing up z scores of three lipid items (triglycerides, low density lipoprotein-cholesterol, and high density lipoprotein-cholesterol). Physical fitness was assessed by using the Japanese standardised fitness test. For body fatness, a percentage of overweight was calculated with using age-, sex-, height-specific standardised body mass. For combined analysis (fitness × fatness), the participants were cross-tabulated into four groups (Non-Obese/Higher-Fit, Non-Obese/Lower-Fit, Obese/Higher-Fit, and Obese/Lower-Fit). The results demonstrated that the participants in fitness categories A/B [most fit] and C [middle] demonstrated the lower (better) lipid risk score than the participants in fitness categories D/E [least fit] (F _{(2, 222)} = 6.03, p = .003). For body fatness, the lipid risk score in obese group was significantly higher (worse) than that in thin and normal groups (F _{(2, 222)} = 6.08, p = .004). The combined analysis showed that there was a significant interaction (fitness × fatness) on the lipid risk score (F _{(1, 221)} = 4.05, p = .047), suggesting that Obese/Lower-Fit group had the worst risk score compared to the other groups. The present study suggests that improving both fitness and body fatness might be important for better lipid profile in Japanese children and adolescents.</p>

Changes in gastrointestinal hormones: the roles of mastication and exercise / 体力科学

Energy balance plays an important role in weight control. Ghrelin is known to stimulate food intake, while peptide YY (PYY) and glucagon-like peptide (GLP-1) are known to suppress food intake. These appetite-related hormones are affected by behaviours such as exercise and mastication. Increasing the number of times food is chewed during a standard meal suppresses ghrelin secretion and food intake. The intensity of exercise is more strongly related to the secretion of total ghrelin, acylated ghrelin, PYY3-36 and food intake than the duration or mode of exercise. This review summarises the effects of exercise and mastication on appetite-related hormones and/or energy intake.

Factors associated with achieving physical activity guideline in Japanese adolescents / 体力科学

Understanding factors associated with physical activity (PA) is important to promote PA. The purpose of the present study was to investigate factors associated with achieving PA guideline in 293 Japanese adolescents (140 boys and 153 girls). Time spent in moderate to vigorous PA (MVPA) was accessed by using accelerometers. Based on MVPA, the participants were classified as “Active” (≥60 min/day of MVPA) or “Inactive” (<60 min/day of MVPA). Anthropometry, age, screen time, mental health, participation in after-school sport activities, sleep status, and breakfast status were measured as factors potentially associated with achieving PA guideline. Adjusted logistic regression analyses revealed that after-school sports activities were positively associated with the probability of being Active for both sexes (odds ratios [ORs] [95% confidence intervals (CI)] = 3.90 [1.13-13.49] for boys, 4.80 [1.80-12.81] for girls). In addition, body fat was negatively associated with a reduced likelihood of being Active for girls (ORs [95%CI] = 0.93 [0.87-0.97]). Two factor ANOVA revealed that those in Inactive group had significantly lower PA levels than those in Active group on both regular curriculum and extra-curriculum (F _{(1, 138)} = 152.50 for boys, F _{(1, 151)} = 181.95 for girls, p < 0.001). In addition, for girls, there was a significant interaction effect between domain (regular curriculum vs. extra-curriculum) and after-school sport activities (F _{(1, 151)} = 4.91, p = 0.028), suggesting that obtaining higher PA levels on extra-curriculum might be difficult for those who do not belong to any after-school sport activities. Therefore, promoting PA on regular curriculum (i.e., physical education lessons and recess) might be alternative ways to increase PA levels for those individuals. Furthermore, special attention may be needed for girls who have higher body fat to promote PA.

Effect of increased physical activities of daily living on postprandial triacylglycerol concentrations in postmenopausal women / 体力科学

Limited evidence was available to support the effect of self-selected activities performed under free-living conditions on postprandial lipaemia, particularly for older adults. Thus, the aim of the present study was to examine the chronic effect of increased physical activity of daily living on postprandial triacylglycerol (TAG) in postmenopausal women. Twenty-eight postmenopausal women, aged 71 ± 4 years (mean ± SD), were randomly divided into two groups: active (n=14) and control (n=14) groups. The participants in the active group were asked to increase their activities above their usual lifestyle levels for 4 weeks; freely deciding the duration and intensity of their chosen activities. The participants in the control group maintained their usual lifestyle for 4 weeks. All participants were asked to wear a uniaxial accelerometer for 4 consecutive weeks. At baseline and after 4 weeks, all participants rested and consumed a standardised breakfast and lunch after a 24-h period of physical activity avoidance. Blood samples were collected in the fasted state (0 h) and at 2, 4 and 6 h after breakfast. After 4 weeks, the participants in the active group increased their step counts by 600 steps/day (from 6979 ± 2057 to 7586 ± 2301 steps/day, p=0.047). There was no difference in the pattern of postprandial TAG response between groups (trial × time interaction, p=0.335). A previous study has suggested that only recent exercise (i.e., 12h before but not 24 h before) appears to facilitate the exercise-induced postprandial TAG lowering effects. Thus, in the present study, postprandial lipaemia was not reduced after performing self-selected activities under free-living in postmenopausal women.

An Update on Accumulating Exercise and Postprandial Lipaemia: Translating Theory Into Practice / 예방의학회지

Over the last two decades, significant research attention has been given to the acute effect of a single bout of exercise on postprandial lipaemia. A large body of evidence supports the notion that an acute bout of aerobic exercise can reduce postprandial triacylglycerol (TAG) concentrations. However, this effect is short-lived emphasising the important role of regular physical activity for lowering TAG concentrations through an active lifestyle. In 1995, the concept of accumulating physical activity was introduced in expert recommendations with the advice that activity can be performed in several short bouts throughout the day with a minimum duration of 10 minutes per activity bout. Although the concept of accumulation has been widely publicised, there is still limited scientific evidence to support it but several studies have investigated the effects of accumulated activity on health-related outcomes to support the recommendations in physical activity guidelines. One area, which is the focus of this review, is the effect of accumulating exercise on postprandial lipaemia. We propose that accumulating exercise will provide additional physical activity options for lowering postprandial TAG concentrations relevant to individuals with limited time or exercise capacity to engage in more structured forms of exercise, or longer bouts of physical activity. The benefits of accumulated physical activity might translate to a reduced risk of cardiovascular disease in the long-term.

Psychological, Social, and Environmental Factors Associated With Utilization of Senior Centers Among Older Adults in Korea / 예방의학회지

OBJECTIVES: The purpose of the study was to examine the relationships among the psychological, social, and environmental factors influencing the utilization of senior centers among older adults in Korea. METHODS: A questionnaire survey was administered to two types of older adults who lived in Seoul, Korea: 262 older adults who used senior centers (3 places) and 156 older adults who did not use senior centers. RESULTS: Our results showed clearly that the utilization of the senior centers in Korea is affected by higher self-efficacy (odds ratio [OR], 6.08; 95% confidence interval [CI], 3.31 to 12.32), higher perceived benefits (OR, 1.71; 95% CI, 1.16 to 4.36), lower perceived barriers (OR, 6.43; 95% CI, 3.07 to 11.45), higher family support (OR, 4.21; 95% CI, 2.02 to 8.77), and higher support from friends (OR, 4.08; 95% CI, 2.38 to 7.81). The results also showed that participants whose total travel time was 15 to 29 minutes (OR, 2.84; 95% CI, 1.21 to 3.64) or less than 14 minutes (OR, 4.68; 95% CI, 3.41 to 8.41) were more likely to use a senior center than those who had to travel more than 30 minutes. CONCLUSIONS: This study showed that the utilization of senior centers in Korea is affected by psychological, social, and environmental factors, specifically by self-efficacy, perceived benefits, perceived barriers, social support, convenience of transportation, and total travel time to the senior centers. The effects of longer-term utilization of the senior centers by non-users on health-related outcomes in a large population warrant attention.

Use of Senior Center and the Health-Related Quality of Life in Korean Older Adults / 예방의학회지

OBJECTIVE: The purpose of the present study was to examine the relationship between the use of senior center and health-related quality of life in Korean older adults. METHODS: A questionnaire survey was conducted to two types of older adults who lived in Busan, Korea: 154 older adults who used a senior center and 137 older adults who did not use a senior center. The Korean version of short-form 36-item health survey was administered to assess the health-related quality of life. Demographic variables were obtained from a questionnaire. These were gender, age, family status, marital status, education, monthly income, present illness, body mass index and physical activity. RESULTS: The 8-domain scales of physical function and role-physical were significantly higher in the users of the senior center compared with the non-users (F=4.87, p=0.027 and F=7.02, p=0.009, respectively). The 8-domain scales of vitality was also significantly higher in the users of the senior center compared with the non-users (F=7.48, p=0.007). CONCLUSIONS: The present study showed that the users of the senior center have higher physical function, role-physical and vitality compared with the non-users. These findings suggest that although the results are unable to specify causal relationships using the senior center may lead to some improvement in health-related quality of life.

NO EFFECTS OF SHORT-TERM VITAMIN E SUPPLEMENTATION ON INFLAMMATORY AND MUSCLE DAMAGE MARKERS AFTER REPEATED BOUTS OF PROLONGED EXERCISE IN HEALTHY YOUNG MEN / 体力科学

After a single bout of prolonged strenuous exercise, inflammatory and muscle damage markers increase. The present study investigated whether vitamin E supplementation can attenuate inflammatory (C-reactive protein (CRP) and interleukin-6 (IL-6)) and muscle damage (creatine kinase (CK) and lactate dehydrogenese (LDH)) markers after prolonged repeated bouts of cycling in healthy young men. Eight young males (aged 21–30 y) were received both vitamin E supplement (300 mg/day) and placebo (control) for 14 days separated by at least an interval of 1 month in a randomised, counterbalanced design. On day 12 of both trials, subjects cycled at 80% of maximal heart rate in two, 90-min bouts (150 min rest between each). Blood samples were collected on days 1 (baseline), 12 (pre- and post-exercise 1 and pre- and post-exercise 2), 13, 14, and 15. After 14 days of supplementation, serum α-tocopherol concentrations increased in the vitamin E trial (<i>P</i><0.0005) but not the placebo trial. Serum CRP concentrations did not differ between trials and did not significantly change over the observation period in both trials. Serum IL-6, CK, and LDH concentrations increased (<i>P</i>≤0.024) in response to repeated bouts of exercise in both trials but did not differ between trials. The study demonstrates that short-term vitamin E supplementation appears to have no effect on attenuating markers of inflammatory and muscle damage in response to repeated bouts of prolonged exercise in healthy young men.