Zhang Y.,Tianjin University of Sport
Journal of Computational and Theoretical Nanoscience | Year: 2016
Asia is a relatively active region in world volleyball; however, research on Asian volleyball still remains at the stage of experiencing. Aims at features of Asian volleyball pass technique influential factors model is established in the paper, main factors that affect Asian volleyball pass technique are found, and Asian volleyball performance is effectively improved. It provides scientific and powerful references and guidance for teaching and training of volleyball, so that forms perfect system, offers evidences, enabling training and talents selection to be more reliable. Such a research achievement will provide theoretical guidance for training and selection of athletes, and provide scientific guidance for further improving the level of Asian volleyball and the development of Asian volleyball. Copyright © 2016 American Scientific Publishers All rights reserved.
Wang Y.,Tianjin University of Sport |
Asaka T.,Hokkaido University |
Watanabe K.,Institute of Sports and Health Science
Experimental Brain Research | Year: 2013
We studied multi-muscle synergies of healthy elderly persons during preparation to making a step (self-paced vs. reaction time). The uncontrolled manifold hypothesis was used to explore the organization of leg and trunk muscles into groups (M-modes) and co-variation of M-mode involvement (M-mode synergies) during stepping tasks. We hypothesized that aging accounts for changes in the structure of M-modes, as well as in M-mode synergies. Subjects performed two tasks: (1) a cyclic COP shift over a range corresponding to the maximal amplitude of voluntary COP shift at 1 Hz, (2) stepping tasks under 3 instructions, "comfortably, self-paced," "very quick, self-paced," and "as fast as possible to a visual signal." Electromyographic signals of 10 postural muscles were recorded and analyzed. Principal component analysis was used to identify M-modes within the space of integrated indices of muscle activity in the cyclic sway task. Variance in the M-mode space across stepping trials was partitioned into two components, one that did not affect the average value of COP shift and the other that did. An index (ΔV) corresponding to the normalized difference between two components of variance was computed. The elderly subjects showed more "co-contraction M-mode" and "mixed M-mode" than that of the young subjects. During stepping tasks, both subject groups showed M-mode synergies stabilizing COP shifts in the stepping and supporting legs. The synergies of elderly subjects showed a smaller and delayed value than that of the young subjects. These results suggest that aging is associated with diminished control in multi-muscle synergies in the anticipatory postural adjustments during gait initiation. © 2013 Springer-Verlag Berlin Heidelberg.
Alatengsaqier,Tianjin University of Sport
Agro Food Industry Hi-Tech | Year: 2017
With the development of society, artificial intelligence has been extensively applied, and the application of intelligent teaching has become a trend. The emergence of Design Based Research (DBR) provides opportunities, which makes research on artificial intelligence courses better and faster. As such, research on the teaching of artificial intelligence courses based on DBR was performed. The development status and application process of DBR were briefly introduced. With the development of artificial intelligence course teaching, the teaching of artificial intelligence courses based on DBR was studied. Results show that research on the teaching of artificial intelligence based on DBR is conducive to the development of artificial intelligence.
Tan S.,Tianjin University of Sport |
Li W.,Tianjin University of Finance and Economy |
Wang J.,University of Southern Queensland
Journal of Sports Science and Medicine | Year: 2012
This study evaluated the effects of a 6-month combined aerobic and resistance training program on the body composition, glycemic control, lipid profile, and functional capacity of older patients with a long history of type 2 diabetes. 25 subjects (65.9 ± 4.2 yrs; M/F: 13/12) with a long history of type 2 diabetes (16.7 ± 6.7 yrs) were randomly allocated into either the exercise or control groups. The exercise group trained three sessions a week. Each session consisted of a warm-up period, 30 minutes of moderate aerobic exercise, 10 minutes of resistance training with five leg muscle exercises (two sets of 10-12 repetitions at 50-70% of 1RM for each activity), and a cool-down period. The variables of body composition, glycemic control, lipid profile, and functional capacity were measured before and after the study period. Exercise training decreased waist-hip ratio and body fat of the trained subjects. Concentrations of fasting and 2- hour post-glucose challenge plasma glucose and serum insulin, and glycosylated hemoglobin decreased significantly in the exercise group. Exercise training improved the lipid profile and also increased the leg muscle strength and 6-minute walking distance of the trained subjects. The control group, however, increased their body fat and fasting plasma glucose, while other variables were not changed during the study period. The current results demonstrate that elderly patients with a long history of type 2 diabetes can benefit from the 6-month combined aerobic and resistance training program. © Journal of Sports Science and Medicine (2012).
Ji L.L.,University of Minnesota |
Zhang Y.,Tianjin University of Sport
Free Radical Research | Year: 2014
Contraction-induced production of reactive oxygen species (ROS) has been implicated in oxidative stress to skeletal muscle for the past few decades. As research advances more evidence has revealed a more complete role of ROS under both physiological and pathological conditions. The current review postulated that moderate intensity of physical exercise has antioxidant and anti-inflammatory effects due to the operation and cross-talks of several redox-sensitive signal transduction pathways. The functional roles and mechanisms of action of the nuclear factor κB, mitogen-activated protein kinase, and peroxisome proliferator-activated receptor γ co-activator 1α are highlighted. © 2013 Informa UK, Ltd.
Wang Y.,Tianjin University of Sport |
Watanabe K.,Institute of Sports and Health Science |
Asaka T.,Hokkaido University
Research in Sports Medicine | Year: 2015
The aim of this article was to explore age-related differences in the muscle modes (M-modes) during voluntary body sway (VS). M-modes were defined as trunk and leg muscles organized into groups with parallel scaling of muscle activation level within a group. We hypothesized that, in comparison with young performers, older adults would show changes in the compositions of M-modes stabilizing the anterior-posterior (AP) center of pressure (COP) displacement. Young (27.5 ± 7.3 yr, 164.6 ± 9.7 cm and 58.4 ± 10.6 kg) and older (69.4 ± 6.4 yr, 160.0 ± 7.0 cm and 58.9 ± 7.5 kg) subjects performed the VS task in the AP direction while trying to minimize sway in the medio-lateral direction. EMG signals of 10 postural muscles were recorded and analyzed. Principal component analysis (PCA) was used to identify three M-modes within the space of integrated indices of muscle activity. The main findings were (1) that there were no age-related differences in magnitude of the COP displacement or amount of variance explained by the principal components (m-modes), and (2) that the number of times co-contraction and mixed m-modes were used were significantly higher for older adults, and the number of times reciprocal m-modes were used were significantly higher for young adults. These observations suggest that aging is associated with a reduced ability to unite dorsal and ventral muscles of the body, which may be reflective of the CNS developing a useful strategy when faced with self-triggered perturbations. © 2014 © 2014 Taylor & Francis.
Liu S.-S.,CAS Institute of Zoology |
Liu S.-S.,Tianjin University of Sport
Annals of the New York Academy of Sciences | Year: 2010
We examined the intrinsic relation between two interdependent and interacted processes, namely, chemiosmotic energy coupling partition and redox signaling involved in mitochondrial respiration. The following aspects of research were conducted and discussed: generation sites and release sidedness of superoxide from the Q cycle of complex III of the mitochondrial respiratory chain; the different physiological roles of PMF components, ΔΨ and ΔpH (ΔpHS), of the Q cycle in mitochondrial superoxide generating and partitioning; and direct feedback effects of Q cycle-derived O2 •- on PMF energy partition through its interaction with protons in ΔpHS to form HO2 •, leading to decreasing ΔpHS and ATP synthesis due to its increasing effects of basic proton leak of mitochondria. The present experimental data give new evidence for our hypothesis of reactive oxygen species cycle cooperation with Q cycle and H+ cycle in respiratory chain in keeping PMF energy partition and its equilibrium with redox signaling regulation of mitochondrial respiration. © 2010 New York Academy of Sciences.
Liu W.,Tianjin University of Sport |
Zhou C.,Shanghai University of Sport
Psychoneuroendocrinology | Year: 2012
Both chronic mild stress and an injection of corticosterone induce depression-like states in rodents. To further link mitochondrial dysfunction to the pathophysiology of major depression, here we describe two rat models of a depressive-like state induced by chronic unpredictable mild stress (CUMS) or corticosterone treatment (CORT). It is also a model that allows the simultaneous study of effects of exercise preconditioning on behavioral, electrophysiological, biochemical and molecular markers in the same animal. Exercise preconditioning ahead of CUMS and CORT treatment prevents many behavioral abnormalities resulted from CUMS. The changes in mitochondrial activity in brain and reduced expressions of superoxide dismutase (SOD1, SOD2), mitofusin (Mfn1, Mfn2) as well as brain-derived neurotrophic factor (BDNF) suggest that both CORT and CUMS may impair mitochondrial function and/or expressions of mitofusion and antioxidant enzymes that, in turn, may increase oxidative stress and reduce energy production in brain with depression-like behaviors. These findings suggest an underlying mechanism by which CORT, as well as CUMS, induces brain mitochondrial dysfunction that is associated with depressive-like states. Remarkably, physical exercise is identified as a helpful and preventive measure to promote mitochondrial function and expressions of mitofusin, BDNF and antioxidant enzymes in brain, so as to protect brain energy metabolism against CUMS, rather than the compound of corticosterone. © 2011 Elsevier Ltd.
Liao P.,Tianjin University of Sport |
Zhou J.,Tianjin University of Sport |
Ji L.L.,University of Wisconsin - Madison |
Zhang Y.,Tianjin University of Sport
American Journal of Physiology - Regulatory Integrative and Comparative Physiology | Year: 2010
Eccentric contraction (EC) is known to elicit inflammation and damage in skeletal muscle. Proinflammatory cytokine TNF-α plays an important role in this pathogenesis, but the time course of its response to EC and the regulatory mechanisms involved are not clear. The purpose of the study is twofold: 1) to investigate the gene expression of TNF-α in rat muscle during and after an acute bout of downhill running and the associated oxidoreductive (redox) changes; and 2) to examine whether EC activates muscle ubiquitin-proteolytic pathway resulting in necrosis and oxidative damage. Female Sprague-Dawley rats (age 3 mo) were randomly divided into five groups (n = 6) that ran on treadmill at 25 m/min at - 10% grade for 1 h (group 1) or 2 h (group 2) and were killed immediately; ran for 2 h and killed at 6 h after exercise (group 3), ran for 2 h and killed at 24 h after exercise (group 4); and killed at rest as controls (group 5). TNF-α mRNA and protein content showed progressive increases in the deep portion of vastus lateralis (DVL) and gastrocnemius muscles during and after EC. These changes were accompanied by a progressive decrease of mitochondrial aconitase activity and NF-κB activation. After 2 h of exercise, elevated levels of serum TNF-α, endotoxin, creatine kinase, and lipid peroxidation marker were evident and persisted through 24 h postexercise. At 24 h, there were marked increases in H2O2 concentration, myleoperoxidase activity, and endotoxin level, along with nuclear accumulation of p65, in both muscles. mRNA level of ubiquitin-conjugating enzymes (E2)-14k was progressively upregulated during exercise and recovery, whereas the expression of the Toll-like receptor 4 (TLR4) in DVL was downregulated in both muscles. We conclude that prolonged EC induces TNF-α expression possibly due to NF-κB activation stimulated by increased reactive oxygen species generation and endotoxin release. These inflammatory and prooxidative responses may underlie the processes of muscle proteolysis and oxidative damage. Copyright © 2010 the American Physiological Society.
Qi F.,Tianjin University of Sport
International Journal of Advancements in Computing Technology | Year: 2012
The problem of evaluating the sports management system with interval-valued intuitionistic fuzzy information is the multiple attribute decision making (MADM) problems. In this paper, we investigate the multiple attribute decision making (MADM) problems for evaluating the sports management system with interval-valued intuitionistic fuzzy information. We utilize the interval-valued intuitionistic fuzzy weighted averaging (IVIFWA) operator to aggregate the interval-valued intuitionistic fuzzy information corresponding to each alternative, and then rank the alternatives and select the most desirable one(s) according to the score function and accuracy function. Finally, an illustrative example for sports management system with interval-valued intuitionistic fuzzy information is given.