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( Hideaki Soya ),( Masahiro Okamoto ),( Takashi Matsui ),( Min Chul Lee ),( Koshiro Inoue ),( Shimpei Nishikawa ),( Shingo Soya ),( Takahiko Fujikawa ),( Rakwal Randeep ),( Hyuk Ki Chang ),( Takeshi N 한국운동영양학회 2011 Physical Activity and Nutrition (Phys Act Nutr) Vol.15 No.1
The brain is considered to be an organ which can be affected by conditioning or exercise, just like muscles. Exercise activates the brain and enhances several neuronal functions and may lead to several neuronal plastic changes. Neuronal c-Fos accumulation in any hypothalamic nuclei increased only with supra-LT exercise, revealing a LT-like activation pattern. In the brain stem, both supra-LT and below-LT exercise activated the VLM and NTS. In case of hippocampus, its activation was induced by under-LT exercise, which increased regional blood flow through neurovascular coupling. Thus, we found that regions of brain activation were determined differently based on exercise intensity. In the further, more research on exercise intensive is indispensable. In this paper, we reviewed: (1) Hippocampal plasticity through exercise (2) Brain region-specific differential activation patterns with exercise below and above the lactate threshold (3) Hippocampal neuronal activity induced by mild exercise below the lactate threshold: regional blood flow monitoring in the hippocampus (4) Acute mild exercise induces BDNF and short-term training causes AHN (5) Why below-LT exercise is sufficient for hippocampal plasticity (6) Hippocampal activation mechanism during exercise. In particular, based on our recent findings, our focus was directed upon exercise-induced brain activation and neurogenesis.
The Lempel-Ziv Complexity in Infinite Ergodic Systems
Soya Shinkai,Yoji Aizawa 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.1I
The L1-function property of the Lempel-Ziv complexity of 2- and 3-symbol sequences is numerically studied in the framework of the in.nite ergodic theory. Our results show that the L1-function property is consistent in the case of plural indierent .xed points with same order singularities near each point.
Hideaki Soya,Hiroki Yanagisawa,Ippeita Dan 한국체육학회 2009 International journal of human movement science Vol.3 No.2
Recently a growing number of human studies have reported the beneficial influence of acute moderate exercise on cognitive functions. Neurocognitive investigations into such neural substrates have mainly been performed using electroencephalography. However, we recently introduced multichannel functional near-infrared spectroscopy (fNIRS), which is a noninvasive and nonrestrictive optical method to monitor cerebral hemodynamics reflecting regional neural activation. We found improved cognitive performance for Stroop interference elicited by an acute bout of moderate exercise that coincided with enhanced cortical activation in the dorsolateral prefrontal cortex. In a previous study, we set the duration of the exercise at 10 min, but the extent to which we could shorten exercise duration remained uncertain. Thus, here we assessed the effects of various durations of acute exercise on neurocognitive performance during an incongruent Stroop task. We present the first experimental evidence that a minimum of 10 min of acute exercise with an intensity of 50% of the maximum oxygen intake is necessary in order to improve cognitive performance on a Stroop interference test. In combination with facilities enabling strict physiological control, fNIRS is a promising tool that will serve to cultivate a novel application in sports science namely, elucidating, in detail, the cognitive effects of physical exercise.