Japanese Journal of Physical Fitness and Sports Medicine
Online ISSN : 1881-4751
Print ISSN : 0039-906X
ISSN-L : 0039-906X
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Volume 63, Issue 3
Displaying 1-9 of 9 articles from this issue
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Review
  • Prevention of lifestyle-related diseases by chronological nutrition
    Yasuo Kagawa
    2014 Volume 63 Issue 3 Pages 293-304
    Published: June 01, 2014
    Released on J-STAGE: May 24, 2014
    DOIhttps://doi.org/10.7600/jspfsm.63.293
    JOURNAL FREE ACCESS
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    Chronological nutrition is based on biological clocks that include clock genes and telomeres. Clock genes predict the day/night cycle to regulate both physical and mental activity in best condition, and prevent lifestyle-related diseases. Telomeres, the repeated series of DNA sequences that cap the ends of chromosomes, become shorter during cell division, thus determine lifespan of the individuals and organs. Even when dietary intake and exercise are adequate, disturbance of diurnal rhythm results in hypertension and hyperglycemia. Human activity is driven by NADH and ATP produced from nutrients, and the resulting NAD and AMP prevent telomere shortening by activating enzymes called SIRT1 and AMPK, respectively. Both enzymes collaborate in activating the master regulator PGC-1α that prevents oxidative stress and obesity. Physical activity increases PGC-1α and releases a hormone irisin from muscle that also prevents obesity. The dietary habit conforming good chronological nutrition are as follows: take nutritionally balanced breakfast every morning, distribute energy intake in the ratio breakfast: lunch: dinner = 3:3:4, and avoid dinner later than 21 o’clock or take earlier light dinner. Slow feeding and the intake of vegetables before carbohydrate are recommended to prevent rapid blood sugar increase. Regular 7 hour sleep is essential for the removal of metabolic wastes by “brain glymph system” to prevent dementia. The homeostatic and hedonic feeding and daily activity are controlled by human brain. Thus, lifestyle-related diseases will be prevented by moderation following the principles of chronological nutrition, irrespective of risk gene polymorphism.
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  • Relationship between the exercise history from early childhood through adulthood and bone health determined using dual energy X-ray absorptiometry in young Japanese premenopousal females
    Ayako Yamaguchi-Watanabe, Makoto Ayabe, Hitoshi Chiba, Noriko Kobayash ...
    2014 Volume 63 Issue 3 Pages 305-312
    Published: June 01, 2014
    Released on J-STAGE: May 24, 2014
    DOIhttps://doi.org/10.7600/jspfsm.63.305
    JOURNAL FREE ACCESS
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    The purpose of the present investigation was to examine the relationships between the exercise history and the bone mineral density (BMD) and bone mineral content (BMC) in female Japanese young adults using dual X-ray absorptiometry (DXA). One-hundred twenty females, aged between 18 to 28 years, participated in the present investigation. The BMD at the lumbar spine (L-BMD), whole body BMD and BMC (WB-BMD and WB-BMC), lean body mass (LBM) and fat mass (FM) were measured by DXA. Using a self-administrered questionnaire, the exercise habits during preschool (4-6 years), primary school (7-12 years), junior high school (13-15 years), high school (16-18 years), and the current habits (>18 years) were eveluated. The L-BMD, WB-BMD and WB-BMC were significantly higher in the subjects with exercise habits during both the period of <18 years and >18 years compared with those in the subjects without an exercise history during all periods (p<0.05). In a separate analysis with the data stratified by the school age, the subjects with an exercise history during primary school, junior high school, or high school had significantly higher BMD and BMC values compared with the non-exercisers (each, p<0.05). In contrast, the BMD and BMC did not differ significantly according to either the exercise history during pre-school nor the current exercise status. A multiple stepwise regression analysis revealed that the body weight, LBM, FM, age of menarche, and exercise habits during high school were significant determinants of the L-BMD, WB-BMD and WB-BMC (p<0.001). The results of the present investigation show that both the exercise history during school age and the current exercise habits affect the BMD and BMC in young adults. In particular, high school females should be encouraged to participate in the regular exercise to increase their bone health. Future studies will be needed to confirm the targeted age-group(s) for participation in sports/exercise for the improvement of bone health, including an analysis of the type and intensity of exercise/sports.
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  • Nutrition interventions improve anemic status in male college long-distance runners
    Kimiko Kazami, Kinya Ashida, Yuko Sato, Toshihiro Arai, Masatoshi Kaza ...
    2014 Volume 63 Issue 3 Pages 313-321
    Published: June 01, 2014
    Released on J-STAGE: May 24, 2014
    DOIhttps://doi.org/10.7600/jspfsm.63.313
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    College athletes often tend to suffer from defective nutrition status due to excessive physical training with inadequate dietary intakes, which resulted in various physical disorders such as anemia. This study was conducted to investigate the effects of nutrition interventions to the anemic state of long distance runners. A nutritional education program was applied and daily single pack of nutritional supplement drink rich in iron, zinc, copper, selenium as well as eleven vitamins were provided for two months. Blood hemoglobin, red blood cells as well as serum ferritin and iron levels after the intervention were significantly higher compared with the basal, pre-intervention level of respective items. Among the subjects, two were found to be anemic (hemoglobin<13g/dl) before the intervention. Both of them, however, were successfully recovered to normal status (hemoglobin≧13g/dl) thereafter. The pre-intervention levels of hemoglobin were negatively correlated to the amount of difference between those of pre- and post-intervention, which appeared to indicate an improvement of nutrient deficiency that caused the hypochromia. On the other hands, the intake of energy and nutrients from meals did not change before and after the intervention. From the results obtained, it seems to be appropriate to emphasize the importance of nutrition education, especially, a possible effectiveness of including multiple nutrient supplementation in nutrition program for college athletes is suggested.
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  • Relationship of exercise at preschool and out of school and daily physical activity to physical fitness in preschool children in the Kanto region: a cross-sectional study
    Chiaki Tanaka, Yuki Hikihara, Takafumi Ando, Kazunori Ohkawara, Chiyok ...
    2014 Volume 63 Issue 3 Pages 323-331
    Published: June 01, 2014
    Released on J-STAGE: May 24, 2014
    DOIhttps://doi.org/10.7600/jspfsm.63.323
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    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.
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  • The effects of dietary modification, aerobic exercise training, and combined dietary modification and aerobic exercise training on central and peripheral arterial stiffness in obese men
    Asako Zempo-Miyaki, Rina So, Hiroshi Kumagai, Kiyoji Tanaka, Nobutake ...
    2014 Volume 63 Issue 3 Pages 333-341
    Published: June 01, 2014
    Released on J-STAGE: May 24, 2014
    DOIhttps://doi.org/10.7600/jspfsm.63.333
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    Obesity and increasing of arterial stiffness are known as independent risk factors for cardiovascular disease. Previously, we demonstrated that dietary modification or aerobic exercise training can decrease arterial stiffness in obese individuals. However, it has not been compared the effect of dietary modification and/or aerobic exercise training on arterial stiffness in obese men. We compared the effect of three patterns of lifestyle modification (i.e., dietary modification, aerobic exercise training or combined them) on arterial stiffness in obese men. Fifty-three obese men completed the 12-week lifestyle modification program, dietary modification (D), aerobic exercise training (E) or combined D and E (DE). Before and after the program, all participants were measured central, peripheral, and systemic arterial stiffness (measured by carotid-femoral pulse wave velocity [cfPWV], femoral-ankle PWV [faPWV] and brachial-ankle PWV [baPWV]). We demonstrated that the degree of decrease in BMI was the greatest after DE, and that was greater after D than E. The level of decrease in baPWV after DE was the greatest among three interventions. On the other hand, the level of decrease in baPWV in D group was similar to E group. These results suggested that systemic arterial stiffness may be decreased by different mechanisms between D and E groups. We demonstrated that dietary modification decreased central and systemic arterial stiffness, and aerobic exercise training decreased central, systemic, and peripheral arterial stiffness in obese individuals. We also showed an additional effect of decreasing systemic arterial stiffness by combining dietary modification and aerobic exercise training in obese individuals.
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  • Relationship between physical function and hamstrings strain in junior high school soccer players
    Yutaro Ikeno, Wataru Fukuda, Yusuke Kataoka, Yuka Hamano, Kenta Takeuc ...
    2014 Volume 63 Issue 3 Pages 343-348
    Published: June 01, 2014
    Released on J-STAGE: May 24, 2014
    DOIhttps://doi.org/10.7600/jspfsm.63.343
    JOURNAL FREE ACCESS
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    In this study, we examined the relationship between physical function and muscle strain of hamstrings in junior high school soccer players. The subjects were 29 junior high school soccer players. The muscle strength of knee flexors and extensors relative to body weight and the hamstrings/quadriceps muscle strength ratio (H/Q ratio) were measured, and a tightness test, general joint looseness test and the New Physical Fitness Test of Japanese Ministry of Education and science were performed. We contacted the trainer to confirm occurrence of hamstrings strain, and we compared the above measurement and test results in subjects with and those without hamstring strain. Differences were analyzed by the unpaired t-test. There were significant differences between the two groups in muscle strength of knee extensors, H/Q ratio and tightness of hamstrings (p<0.05). The results suggest that increasing the H/Q ratio and stretching hamstrings are important for preventing hamstrings strain in junior high school soccer players.
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