Guangzhou Institute of Physical Education

Guangzhou, China

Guangzhou Institute of Physical Education

Guangzhou, China

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Fan Y.,Fujian Normal University | Li Z.,Jinan University | Han S.,Fujian Normal University | Lv C.,Guangzhou Institute of Physical Education | Zhang B.,Guangzhou Institute of Physical Education
Gait and Posture | Year: 2016

Walking speed is a basic factor to consider when walking exercises are prescribed as part of a training programme. Although associations between walking speed, step length and falling risk have been identified, the relationship between spontaneous walking pattern and falling risk remains unclear. The present study, therefore, examined the stability of spontaneous walking at normal, fast and slow speed among elderly (67.5 ± 3.23) and young (21.4 ± 1.31) individuals. In all, 55 participants undertook a test that involved walking on a plantar pressure platform. Foot-ground contact data were used to calculate walking speed, step length, pressure impulse along the plantar-impulse principal axis and pressure record of time series along the plantar-impulse principal axis. A forward dynamics method was used to calculate acceleration, velocity and displacement of the centre of mass in the vertical direction. The results showed that when the elderly walked at different speeds, their average step length was smaller than that observed among the young (p = 0.000), whereas their anterior/posterior variability and lateral variability had no significant difference. When walking was performed at normal or slow speed, no significant between-group difference in cadence was found. When walking at a fast speed, the elderly increased their stride length moderately and their cadence greatly (p = 0.012). In summary, the present study found no correlation between fast walking speed and instability among the elderly, which indicates that healthy elderly individuals might safely perform fast-speed walking exercises. © 2016 Elsevier B.V.


PubMed | Jinan University, Guangzhou Institute of Physical Education and Fujian Normal University
Type: | Journal: Gait & posture | Year: 2016

Walking speed is a basic factor to consider when walking exercises are prescribed as part of a training programme. Although associations between walking speed, step length and falling risk have been identified, the relationship between spontaneous walking pattern and falling risk remains unclear. The present study, therefore, examined the stability of spontaneous walking at normal, fast and slow speed among elderly (67.53.23) and young (21.41.31) individuals. In all, 55 participants undertook a test that involved walking on a plantar pressure platform. Foot-ground contact data were used to calculate walking speed, step length, pressure impulse along the plantar-impulse principal axis and pressure record of time series along the plantar-impulse principal axis. A forward dynamics method was used to calculate acceleration, velocity and displacement of the centre of mass in the vertical direction. The results showed that when the elderly walked at different speeds, their average step length was smaller than that observed among the young (p=0.000), whereas their anterior/posterior variability and lateral variability had no significant difference. When walking was performed at normal or slow speed, no significant between-group difference in cadence was found. When walking at a fast speed, the elderly increased their stride length moderately and their cadence greatly (p=0.012). In summary, the present study found no correlation between fast walking speed and instability among the elderly, which indicates that healthy elderly individuals might safely perform fast-speed walking exercises.


Fan Y.,Guangzhou Institute of Physical Education | Fan Y.,Beihang University | Li Z.,Jinan University | Lv C.,Guangzhou Institute of Physical Education | Luo D.,Guangzhou Institute of Physical Education
PLoS ONE | Year: 2011

There has been a controversy as to whether or not the non-pathological flat foot and high-arched foot have an effect on human walking activities. The 3D foot scanning system was employed to obtain static footprints from subjects adopting a half-weight-bearing stance. Based upon their footprints, the subjects were divided into two groups: the flat-footed and the high-arched. The plantar pressure measurement system was used to measure and record the subjects' successive natural gaits. Two indices were proposed: distribution of vertical ground reaction force (VGRF) of plantar and the rate of change of footprint areas. Using these two indices to compare the natural gaits of the two subject groups, we found that (1) in stance phase, there is a significant difference (p<0.01) in the distributions of VGRF of plantar; (2) in a stride cycle, there is also a significant difference (p<0.01) in the rate of change of footprint area. Our analysis suggests that when walking, the VGRF of the plantar brings greater muscle tension to the flat-footed while a smaller rate of change of footprint area brings greater stability to the high-arched. © 2011 Fan et al.


Fan Y.,Guangzhou Institute of Physical Education | Fan Y.,Beihang University | Li Z.,Jinan University | Lv C.,Guangzhou Institute of Physical Education | Zhang B.,Guangzhou Institute of Physical Education
PLoS ONE | Year: 2012

Bone shape is an important factor to determine the bone's structural function. For the asymmetrically shaped and anisotropically distributed bone in vivo, a surface mapping method is proposed on the bases of its geometric transformation invariance and its uniqueness of the principal axes of inertia. Using spiral CT scanning, we can make precise measurements to bone in vivo. The coordinate transformations lead to the principal axes of inertia, with which the prime meridian and the contour can be set. Methods such as tomographic reconstruction and boundary development are employed so that the surface of bone in vivo can be mapped. Experimental results show that the surface mapping method can reflect the shape features and help study the surface changes of bone in vivo. This method can be applied to research into the surface characteristics and changes of organ, tissue or cell whenever its digitalized surface is obtained. © 2012 Fan et al.


Fan Y.,Guangzhou Institute of Physical Education | Fan Y.,Beihang University | Li Z.,Jinan University | Loan M.,Jinan University | And 2 more authors.
PLoS ONE | Year: 2011

Bone modeling and remodeling is an optimization process where no agreement has been reached regarding a unified theory or model. We measured 384 pieces of bone in vivo by 64-slice CT and discovered that the bone's center of mass approximately superposes its centroid of shape. This phenomenon indicates that the optimization process of non-homogeneous materials such as bone follows the same law of superposition of center of mass and centroid of shape as that of homogeneous materials. Based upon this principle, an index revealing the relationship between the center of mass and centroid of shape of the compact bone is proposed. Another index revealing the relationship between tissue density and distribution radius is followed. Applying these indexes to evaluate the strength of bone, we have some new findings. © 2011 Fan et al.


PubMed | Beihang University, Jinan University and Guangzhou Institute of Physical Education
Type: Journal Article | Journal: PloS one | Year: 2014

No consensus has been reached on how musculoskeletal system injuries or aging can be explained by a walking plantar impulse. We standardize the plantar impulse by defining a principal axis of plantar impulse. Based upon this standardized plantar impulse, two indexes are presented: plantar pressure record time series and plantar-impulse distribution along the principal axis of plantar impulse. These indexes are applied to analyze the plantar impulse collected by plantar pressure plates from three sources: Achilles tendon ruptures; elderly people (ages 62-71); and young people (ages 19-23). Our findings reveal that plantar impulse distribution curves for Achilles tendon ruptures change irregularly with subjects walking speed changes. When comparing distribution curves of the young, we see a significant difference in the elderly subjects phalanges plantar pressure record time series. This verifies our hypothesis that a plantar impulse can function as a means to assess and evaluate musculoskeletal system injuries and aging.


Tikkanen O.,University of Jyväskylä | Tikkanen O.,Mega Electronics Ltd | Tikkanen O.,Pajulahti Sports Center | Hu M.,University of Jyväskylä | And 5 more authors.
Physiological Measurement | Year: 2012

The present study examined whether shorts with textile electromyographic (EMG) electrodes can be used to detect second ventilatory threshold (V T2) during incremental treadmill running. Thirteen recreationally active (REC) and eight endurance athletes were measured for EMG, heart rate, blood lactate and respiratory gases during VO 2maxtest (3 min ramps, 1 kmh 1increments). V T2, onset of blood lactate accumulation (OBLA) and EMG threshold (EMG T) were determined. In athletes, OBLA occurred at 56 6 mLkg 1min 1, V T2occurred at 59 6 mLkg 1min 1, and EMG T at 62 6 mLkg 1min 1without significant differences between methods (analysis of variance: ANOVA). In REC participants, OBLA occurred at 40 10 mLkg 1min 1, V T 2occurred at 43 7 mLkg 1min 1, and EMG T at 41 9 mLkg 1min 1without significant differences between methods (ANOVA). For the entire group, correlation between EMG T and V T2was 0.86 (P < 0.001) and 0.84 (P < 0.001) between EMG T and OBLA. Limits of agreement between EMG T and V T2were narrower in athletes than in REC participants. Thus, it is concluded that estimation of V T 2using EMG T in athletes is more valid than in REC participants. In practice, experienced runners could use online feedback from EMG garments to monitor whether their running intensity is near V T2. © 2012 Institute of Physics and Engineering in Medicine.


Hu M.,Guangzhou Institute of Physical Education | Sheng J.,Guangzhou Institute of Physical Education | Kang Z.,Guangzhou University | Zou L.,Guangzhou Institute of Physical Education | And 2 more authors.
Journal of Sports Medicine and Physical Fitness | Year: 2014

The aim of this study was to examine the relation between bone marrow adipose tissue (BMAT) and bone mineral density (BMD) of lumbar spine in male professional wrestlers and healthy untrained men. A total of 14 wrestlers (22.9±3.4 years) and 11 controls (24.4±1.6 years) were studied cross-sectionally. Body composition and BMD were measured by dual-energy X-ray absorptiometry. Magnetic resonance imaging of the lumbar spine was examined in a sagittal T1-weighted (T1-w) spin-echo (SE) sequence. The averaged bone marrow signal intensity (SI) of L2-L4 was related to the signal of an adjacent nondegenerative disk. Mean SI of T1-w SE in wrestlers was lower than controls (P=0.001), indicating L2-L4 BMAT in wrestlers was lower compared to controls. L2-L4 BMD in wrestlers was higher than controls (P<0.001). In the total subject population, L2-L4 BMD was inversely correlated with mean SI of T1-w SE (r=-0.62, P=0.001). This association remained strong after adjusting for body mass and whole lean mass, but became weaker after adjusting for whole body or trunk fat percentage. The inverse relationship between BMAT and BMD was confirmed in this relatively small subject sample with narrow age range, which implies that exercise training is an important determinant of this association.


PubMed | Guangzhou Boji Medicinal and Biotechnological Co. and Guangzhou Institute of Physical Education
Type: Journal Article | Journal: Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials | Year: 2014

To observe the effect of immunoregulation and anti-oxidation of Zhongyaofangji NO1 (ZYFJ).1. SPF BALB/C mice were randomly divided into control group (distilled water), positive control group (Broken Spore), ZYFJ low dose group (0.35 g/kg), middle dose group (0.70 g/kg) and high dose group (1.40 g/kg), with intragastric administration 1 time/d for 30d; The spleen and thymus index, ability of spleen lymphocyte proliferation, phagocytosing chicken red blood cell (CRBC) of abdominal macrophage cell, carbon clearance were investigated. 2. SPF BALB/C mice were divided into normal control group, model control group (D-galactose induced peroxidation damage), model plus ZYFJ low dose, middle dose and high dose group, model plus positive control group (Broken Spore), with drug administration 1 time/d for 30 d. SOD activity, MDA and LPO content in brain tissue were tested while Nrf2 [Nuclear factor (erythroi D-derived 2)-like 2] protein expression in brain tissue nucleus was tested by western blotting.The thymus index and spleen index in groups of ZYFJ high dose and positive control were higher than those in control group, the ability of lymphocyte proliferation and phagocytosis of macrophages were increased in all the other groups significantly compared with control group; The activity of SOD and Nrf2 protein expression level in brain tissue of model mice was increased, MDA and LPO contents were reduced in ZYFJ middle and high dose as well as positive control significantly, while the MDA content was reduced and Nrf2 protein was increased in low dose group.Appropriate dose of ZYFJ1 has good effect of immunoregulation, and plays a role of anti-oxidation probably by regulating Nrf2 protein expression in brain tissue and related signaling pathway.


Hu M.,Guangzhou Institute of Physical Education | Lin W.,Guangzhou Institute of Physical Education
Acta Haematologica | Year: 2012

Exercise training can increase total Hb and red cell mass, which enhances oxygen-carrying capacity. The possible underlying mechanisms are proposed to come mainly from bone marrow, including stimulated erythropoiesis with hyperplasia of the hematopoietic bone marrow, improvement of the hematopoietic microenvironment induced by exercise training, and hormone- and cytokine-accelerated erythropoiesis. Anemia is one of the most common medical conditions in chronic disease. The effects of exercise training on counteracting anemia have been explored and evaluated. The results of the research available to date are controversial, and it seems that significant methodological limitations exist. However, exercise training might be a promising, additional, safe and economical method to help improve anemia. There is a need for further investigation into the effects of and guidelines for exercise interventions (especially strength training) in this population of patients, particularly among cancer patients who are undergoing or have undergone chemotherapy or radiation treatments. As the available data are limited, additional research to uncover the underlying mechanisms associated with the effects of exercise training on anemia is clearly warranted. Copyright © 2012 S. Karger AG.

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