This research focuses on how to control the robot easily and how to generate the better trajectories of the robot with multiple joints to implement weightlifting motion. The purpose of this research is to develop a mu...This research focuses on how to control the robot easily and how to generate the better trajectories of the robot with multiple joints to implement weightlifting motion. The purpose of this research is to develop a multijoint robot can stand up successfully with an object. This research requires the operations with two items. First, when the object is lifted up slowly, the robot could stand up as easily as possible and does not tumble down. Second, the load applied on each joint should be as small as possible. In this article, a motion control method is proposed to evaluate the variations of the load torque and rotated angle of each joint with the geometrical constraints in the procedure and find the best algorithm to generate the trajectory of a weightlifting motion by a stance robot with repeatedly direct kinematics.展开更多
OBJECTIVE: To evaluate the effect of Gua Sha therapy on weightlifting training.METHODS: The sample size was calculated by conducting a pilot study. A total of 44 male weightlifters were randomly assigned to either the...OBJECTIVE: To evaluate the effect of Gua Sha therapy on weightlifting training.METHODS: The sample size was calculated by conducting a pilot study. A total of 44 male weightlifters were randomly assigned to either the Gua Sha group(n = 15), sham scraping group(n = 14), or control group(n = 14). The participants in the Gua Sha group and sham scraping group received 16 sessions of Gua Sha therapy during normal weightlifting training for 8 weeks. No treatment was applied to participants in the control group. The effectiveness of Gua Sha therapy was evaluated by measuring weightlifting ability, the rating of perceived exertion(RPE) of snatch and clean and jerk(85% of1 repetition maximum), and creatinine kinase(CK),blood urea nitrogen(BUN), and immunoglobulin A levels.RESULTS: Gua Sha therapy treatment significantly increased weightlifting ability in participants in the Gua Sha group(P < 0.01). The RPE values of snatch and clean and jerk were significantly lower in the Gua Sha group and sham scraping groups compared with the control group(P < 0.05). CK levels were lower and immunoglobulin A levels were significantly higher in the Gua Sha group compared with sham scraping group and control group(both P < 0.05). BUN levels tended to be reduced only in the Gua Sha group. A close correlation between CK levels and the RPE was found in the Gua Sha group.CONCLUSION: Gua Sha therapy can facilitate weightlifting ability, reduce the RPE, and inhibit muscle injury by promoting recovery from fatigue caused by normal weightlifting training. Gua Sha therapy could be an effective treatment to complement normal weightlifting training.展开更多
INTRODUCTION： Weightlifting has its own individual features, where it is important to select new element as well as individual work with them. Ascertaining these specific features of weightlifting sport, trainers are...INTRODUCTION： Weightlifting has its own individual features, where it is important to select new element as well as individual work with them. Ascertaining these specific features of weightlifting sport, trainers are in charge of drafting as accurately as possible the training process, which should be repeatedly realized. PURPOSE OF THE STUDY： It is recognition of the level of technical, physical and anthropometric indicators of young new weightlifters, eliminating the problems arising during the training process to advance the sporting results. MATERIALS AND METHODS： A total of 14 new weightlifters of the five sports clubs were taken into the study for a period of one year （March 2016-March 2017）. During the development of national and international activities, we showed their technical results in the style of snatch, clean and jerk, while during training showed the indicators in classical auxiliary exercises with those of strength, weight and body height. The method of comparison for reports technical-strength and weight-height with weightlifters at the European and World level of this age group was used. The data subjected to statistical processing with ANOVA method. RESULTS： The optimum coefficient of ratio： the technique snatch with clean and jerk technique at the international level is p 〈 0.79-0.80, compared to our weightlifters in the study, showed that there is oscillation from the optimum p 〈 0.001 to p 〈 0.006. The coefficient weight to height moves 13-16 cm. CONCLUSIONS： This avoidance indicates an inadequate distribution of exercises loads during the training process, most of which take snatch exercises, which do not have a good influence on the performance of the clean and jerk technique results. Loads in classical and classical assistive exercises should be distributed to rights reports for high sports achievements.展开更多
OBJECTIVE: To evaluate the effects of Guasha therapy on the rating of perceived exertion(RPE) scale score, and heart rate variability(HRV).METHODS: A randomized controlled trial of Guasha(skin scraping) was compared w...OBJECTIVE: To evaluate the effects of Guasha therapy on the rating of perceived exertion(RPE) scale score, and heart rate variability(HRV).METHODS: A randomized controlled trial of Guasha(skin scraping) was compared with a sham scraping group and control group. Sixteen sessions within an 8-week period were completed. Sixty-five male weightlifters who had undergone normal weightlifting training for a mean of 5 years before study commencement were recruited. The RPEscale score of "snatch", "clean and jerk" maneuvers(85% of one-repetition maximum), and HRV were measured before and after the intervention.RESULTS: The RPE scale score for snatch, clean and jerk were reduced significantly after intervention in the Guasha group and sham group. However, there was a significant difference in the low frequency(LF) domain and LF/high frequency(HF) ratio(P <0.05): the LF domain decreased, and the LF/HF ratio decreased.CONCLUSION: Guasha could be used to reduce the RPE scale score, and increase the response to HRV.Guasha could be considered as an alternative to some types of recovery from sports training.展开更多
The term "Clark Phenomenon" refers to unexpected failures of topranking ahletes in major competitions.Top athletes in the 21 - 24th Olympic Games and top six athletes in the 1- 6th National Games of the even...The term "Clark Phenomenon" refers to unexpected failures of topranking ahletes in major competitions.Top athletes in the 21 - 24th Olympic Games and top six athletes in the 1- 6th National Games of the events of track and field, swimming and weightlifting weree investigated in this study. Statistic analysis of their achievements in major competitions showed that the "Clark Phenomenon" appeared in about one third of these top athletes. The incidence of "Clark Phenomenon" of the top six athletes was 0. 8%. Discussion was made on the causes that lead to serious "Clark Phenomenon" of Chinese athletes in the Olympic Games. An Evaluation Standard of Normal Performance in Major Competition for the events of track and field, swimming and weightlifing was established.展开更多
Aim The concept of post-activation potentiation(PAP)is still novel from a training perspective and lacks breadth relative to weightlifting exercises.Purpose The purpose of this study was to investigate the acute effec...Aim The concept of post-activation potentiation(PAP)is still novel from a training perspective and lacks breadth relative to weightlifting exercises.Purpose The purpose of this study was to investigate the acute effects of a conditioning activity(clean high pulls)on the performance of a main activity(clean)after the conditioning activity.Methods Eleven volunteers who engaged in weightlifting(Male=5,Female=6)participated in two different testing ses-sions(experimental vs.control).Baseline measurements were taken following the warm-up.The testing condition was performed and additional measurements were taken at 30 s,2 min,4 min,6 min,8 min,10 min,and 12 min into recovery.A linear position transducer was used to collect peak power,peak velocity,and displacement of the barbell during the clean.Multiple 2×8 repeated measures ANOVAs were used to analyze the data along with a paired samples t test between baseline and"best"values.Results There was no interaction or main effect for condition(P>0.05).However,there was a significant main effect for time(P<0.05)for all variables.The"best"values were significantly(P<0.05)greater than baseline values(peak power:experimental=1354.76 ±521.24 W vs.baseline 1216.03 ±492.30 W;peak velocity:experimental=2.66 ±0.44 m/s vs.baseline 2.50 ±0.44 m/s;displacement:experimental=111.07 ± 12.09 cm vs.baseline 107.01 ± 11.32 cm).Conclusions The findings of this study are in partial agreement with previous literature where the warm-up was probably enough to elicit PAP.Therefore,recommendations for future studies could include utilizing a more elite population and to ensure all potential participants can squat at least 2 x their body weight.展开更多
文摘This research focuses on how to control the robot easily and how to generate the better trajectories of the robot with multiple joints to implement weightlifting motion. The purpose of this research is to develop a multijoint robot can stand up successfully with an object. This research requires the operations with two items. First, when the object is lifted up slowly, the robot could stand up as easily as possible and does not tumble down. Second, the load applied on each joint should be as small as possible. In this article, a motion control method is proposed to evaluate the variations of the load torque and rotated angle of each joint with the geometrical constraints in the procedure and find the best algorithm to generate the trajectory of a weightlifting motion by a stance robot with repeatedly direct kinematics.
基金Supported by Beijing Municipal Science and Technology Commission,China(grant to BJ,No.Z121107001012148)the Science Technology Project in the Education Department of Jiangxi Province(No.GJJ170811)
文摘OBJECTIVE: To evaluate the effect of Gua Sha therapy on weightlifting training.METHODS: The sample size was calculated by conducting a pilot study. A total of 44 male weightlifters were randomly assigned to either the Gua Sha group(n = 15), sham scraping group(n = 14), or control group(n = 14). The participants in the Gua Sha group and sham scraping group received 16 sessions of Gua Sha therapy during normal weightlifting training for 8 weeks. No treatment was applied to participants in the control group. The effectiveness of Gua Sha therapy was evaluated by measuring weightlifting ability, the rating of perceived exertion(RPE) of snatch and clean and jerk(85% of1 repetition maximum), and creatinine kinase(CK),blood urea nitrogen(BUN), and immunoglobulin A levels.RESULTS: Gua Sha therapy treatment significantly increased weightlifting ability in participants in the Gua Sha group(P < 0.01). The RPE values of snatch and clean and jerk were significantly lower in the Gua Sha group and sham scraping groups compared with the control group(P < 0.05). CK levels were lower and immunoglobulin A levels were significantly higher in the Gua Sha group compared with sham scraping group and control group(both P < 0.05). BUN levels tended to be reduced only in the Gua Sha group. A close correlation between CK levels and the RPE was found in the Gua Sha group.CONCLUSION: Gua Sha therapy can facilitate weightlifting ability, reduce the RPE, and inhibit muscle injury by promoting recovery from fatigue caused by normal weightlifting training. Gua Sha therapy could be an effective treatment to complement normal weightlifting training.
文摘INTRODUCTION： Weightlifting has its own individual features, where it is important to select new element as well as individual work with them. Ascertaining these specific features of weightlifting sport, trainers are in charge of drafting as accurately as possible the training process, which should be repeatedly realized. PURPOSE OF THE STUDY： It is recognition of the level of technical, physical and anthropometric indicators of young new weightlifters, eliminating the problems arising during the training process to advance the sporting results. MATERIALS AND METHODS： A total of 14 new weightlifters of the five sports clubs were taken into the study for a period of one year （March 2016-March 2017）. During the development of national and international activities, we showed their technical results in the style of snatch, clean and jerk, while during training showed the indicators in classical auxiliary exercises with those of strength, weight and body height. The method of comparison for reports technical-strength and weight-height with weightlifters at the European and World level of this age group was used. The data subjected to statistical processing with ANOVA method. RESULTS： The optimum coefficient of ratio： the technique snatch with clean and jerk technique at the international level is p 〈 0.79-0.80, compared to our weightlifters in the study, showed that there is oscillation from the optimum p 〈 0.001 to p 〈 0.006. The coefficient weight to height moves 13-16 cm. CONCLUSIONS： This avoidance indicates an inadequate distribution of exercises loads during the training process, most of which take snatch exercises, which do not have a good influence on the performance of the clean and jerk technique results. Loads in classical and classical assistive exercises should be distributed to rights reports for high sports achievements.
基金the National Natural Science Foundation of China(Research of the Biological Effects and Mechanism of Different Guasha Therapies,No.30672720)the National Natural Science Foundation of China(Comparative Research of Different Acupuncture Stimulation Methods on The Expression of Effects in Acupoint Areas,No.81674079)
文摘OBJECTIVE: To evaluate the effects of Guasha therapy on the rating of perceived exertion(RPE) scale score, and heart rate variability(HRV).METHODS: A randomized controlled trial of Guasha(skin scraping) was compared with a sham scraping group and control group. Sixteen sessions within an 8-week period were completed. Sixty-five male weightlifters who had undergone normal weightlifting training for a mean of 5 years before study commencement were recruited. The RPEscale score of "snatch", "clean and jerk" maneuvers(85% of one-repetition maximum), and HRV were measured before and after the intervention.RESULTS: The RPE scale score for snatch, clean and jerk were reduced significantly after intervention in the Guasha group and sham group. However, there was a significant difference in the low frequency(LF) domain and LF/high frequency(HF) ratio(P <0.05): the LF domain decreased, and the LF/HF ratio decreased.CONCLUSION: Guasha could be used to reduce the RPE scale score, and increase the response to HRV.Guasha could be considered as an alternative to some types of recovery from sports training.
文摘The term "Clark Phenomenon" refers to unexpected failures of topranking ahletes in major competitions.Top athletes in the 21 - 24th Olympic Games and top six athletes in the 1- 6th National Games of the events of track and field, swimming and weightlifting weree investigated in this study. Statistic analysis of their achievements in major competitions showed that the "Clark Phenomenon" appeared in about one third of these top athletes. The incidence of "Clark Phenomenon" of the top six athletes was 0. 8%. Discussion was made on the causes that lead to serious "Clark Phenomenon" of Chinese athletes in the Olympic Games. An Evaluation Standard of Normal Performance in Major Competition for the events of track and field, swimming and weightlifing was established.
文摘Aim The concept of post-activation potentiation(PAP)is still novel from a training perspective and lacks breadth relative to weightlifting exercises.Purpose The purpose of this study was to investigate the acute effects of a conditioning activity(clean high pulls)on the performance of a main activity(clean)after the conditioning activity.Methods Eleven volunteers who engaged in weightlifting(Male=5,Female=6)participated in two different testing ses-sions(experimental vs.control).Baseline measurements were taken following the warm-up.The testing condition was performed and additional measurements were taken at 30 s,2 min,4 min,6 min,8 min,10 min,and 12 min into recovery.A linear position transducer was used to collect peak power,peak velocity,and displacement of the barbell during the clean.Multiple 2×8 repeated measures ANOVAs were used to analyze the data along with a paired samples t test between baseline and"best"values.Results There was no interaction or main effect for condition(P>0.05).However,there was a significant main effect for time(P<0.05)for all variables.The"best"values were significantly(P<0.05)greater than baseline values(peak power:experimental=1354.76 ±521.24 W vs.baseline 1216.03 ±492.30 W;peak velocity:experimental=2.66 ±0.44 m/s vs.baseline 2.50 ±0.44 m/s;displacement:experimental=111.07 ± 12.09 cm vs.baseline 107.01 ± 11.32 cm).Conclusions The findings of this study are in partial agreement with previous literature where the warm-up was probably enough to elicit PAP.Therefore,recommendations for future studies could include utilizing a more elite population and to ensure all potential participants can squat at least 2 x their body weight.
