Shumpei Miyakawa

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To investigate the effects of taurine administration on exercise, we studied taurine concentrations in rat skeletal muscles after endurance running and the duration of running time to exhaustion, with and without taurine administration. For study 1 we divided 40 male SD rats into two groups: endurance exercise group ( n = 20) and sedentary control group ( n(More)
Dehydroepiandrosterone (DHEA), a precursor of sex steroid hormones, is synthesized by cholesterol side-chain cleavage cytochrome P-450 and 17alpha-hydroxylase cytochrome P-450 mainly from cholesterol and converted to testosterone and estrogen by 3beta-hydroxysteroid dehydrogenase (3beta-HSD), 17beta-HSD, and aromatase cytochrome P-450. Although sex steroid(More)
Strenuous and consecutive exercise leads to fatigue symptoms in athletes. Metabolomics is a comprehensive method to assess metabolites that involves the measurements of the overall metabolic signature of biological samples. Using metabolomic analysis, we investigated the identification of salivary fatigue markers in soccer players after 3 consecutive days(More)
STUDY DESIGN Experimental laboratory study. OBJECTIVES To measure trunk muscle activity using wire electrodes during lumbar stabilization exercises and to examine if more effective exercises to activate the deep trunk muscles (local muscles) exist. BACKGROUND Lumbar stabilization exercises are performed to improve motor control of trunk muscles.(More)
BACKGROUND Several studies have reported that physical loading related to competitive sports activities is associated with lumbar intervertebral disk degeneration. However, the association between types of sports activities and disk degeneration has not been clarified. HYPOTHESIS The frequencies of disk degeneration may vary with the competitive sport(More)
BACKGROUND Low back pain is a significant problem not only for the adult, but also during youth. However, the relationship between low back pain during youth and the duration or types of competitive sports has not been clarified. HYPOTHESIS Low back pain during youth is associated with the duration and types of competitive sports. STUDY DESIGN(More)
Long term effect of the growing instability of the bone-implant interface due to bone resorption at the interface is a problem for the implants, including bioactive ceramics. Zn2+ -containing tricalcium phosphate (ZnTCP) is a material which may overcome this problem. The present study aims to clarify whether Zn2+ -containing tricalcium phosphate (ZnTCP)(More)
Taurine concentration in rat skeletal muscles after endurance running, with and without taurine administration was studied. Taurine concentrations in skeletal muscles was significantly decreased in exercised groups without taurine administration. However, taurine administration reduced the decrease of taurine concentration in skeletal muscles in exercise.(More)
OBJECTIVE To compare the effects of 2 different heat modalities, infrared and ultrasonic therapy, on a knee flexion contracture. DESIGN In vivo, experimental, controlled study involving a rat knee joint contracture model that was immobilized using a ligature in flexion for 40 days. SETTING Collegiate research laboratory. ANIMALS Ninety-three adult(More)
BACKGROUND Muscle contraction during short intervals of intense exercise causes oxidative stress, which can play a role in the development of overtraining symptoms, including increased fatigue, resulting in muscle microinjury or inflammation. Recently it has been said that hydrogen can function as antioxidant, so we investigated the effect of hydrogen-rich(More)