To evaluate the effects of red Light-Emitting Diodes on elbow extensor and flexor strength and the recovery of exercise induced fatigue, the torque values from the isokinetic dynamometer as well as biochemistry parameters were used as outcome measures. A randomized double-blind placebo-controlled crossover trial was performed with twenty male young tennis athletes. Active LED therapy (LEDT, with wavelength 625nm, 10 minutes total irradiation time, irradiated area amount to 30cm2, and 900J of total energy irradiated) or an identical placebo was delivered under double-blinded conditions to the left elbow just before exercise. The isokinetic muscle strength was measured immediately after irradiation. The blood lactate levels were sampled pre-exercise and post-exercise. The peak torque values of elbow extensor strength were significantly different between two groups. As in elbow flexor strength, the difference of peak torque was not significant. The blood lactate concentration of LEDT group post-exercise was significantly lower than those of placebo group. The results indicate that 625nm LED therapy is effective in preventing muscle fatigue as it can significantly reduce peak torque value of elbow extensors and blood lactate concentration. It has no effect on the strength of left elbow flexor or backhand performance in tennis.
Skeletal age has been studied and proved that for most elite athletes, it was coincident with the chronological ages when
they were young. In order to explore the application of skeletal age in selecting sports talent, 32 athletes (female,
chronological age 5-12 y) were chosen from the Gymnastics Training Base in this study. Their left hand-wrists were
photographed with X-rays, and then the skeletal ages were estimated by Chinese version of the Tanner-Whitehouse
Skeletal Maturity Assessment System. At the same time, their body shapes, functions, and sports ability were also
measured. Results showed that 71.88% of the skeletal age was proportional to their chronological age (± 1 y); while
18.75% of the skeletal maturity was retarded by 1- 2 year, 9.37% of those was advanced more than 1 year. On the other
hand, the body shape, functions and sports ability of the athletes were positively related with their skeletal maturity. This
study proved that the determination of skeletal maturity is a reliable evaluation for selecting sports talent. A further study
on the influence of gymnastics on the skeletal age is of great significance.
Glycerol with high concentration can enhance optical clearing of skin by injecting into derma, but previous
investigations also found that it may block the blood once glycerol acted on small vessels. This work aims to explore the
safety of glycerol as an optical clearing agent of skin. Here, 0.05ml of 75%, 50%, 40%, 30%, 20% glycerol solutions
and saline were injected into the dorsal dermas of SD rat, respectively. To compare the optical clearing effect, the
diffuse reflectance spectra were monitored just immediately, 2h and 24h after the injection of solutions. In order to
investigate the long term effect of glycerol on the local skin, the photos at the interest area were taken. The results
showed that the high concentration solutions (40%, 50%, 75% glycerol) made local skin necroses badly which was
irreversible in 2 weeks. The low concentration solutions (20% glycerol) could cause neither skin damage nor optical
clearing effect. 30% glycerol could reduce the reflectance spectra of skin by 20% without injury. Therefore, 30%
glycerol is an available agent for skin optical clearing through injection treatment.
This study is to evaluate cardiac systolic and diastolic function of Chinese male canoeists during heavy load exercise
training by Doppler echocardiography. Eighteen young male volunteer canoeists were tested, and trained five weeks.
Then the change of cardiac systolic and diastolic function of the tester was examined by the Doppler echocardiography
method.The results showed that there were no significant differences of LVEF and Δ%D, but the E/A ratio of elite
canoeists reduced (p<0.05) after the heavy load exercise training. Moreover, the ratio of E/A less than 1 was found in
two elite canoeists. The further research is required to understand the mechanism of the change. These results showed
that monitoring of diastolic function was more meaningful than monitoring of systolic function during the heavy load
exercise training, especially not neglected the cardiac function of elite canoeists.
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