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Quem sou eu
- Emerson Franchini
- São Paulo, São Paulo, Brazil
- Professor da EEFE-USP; Praticante e Pesquisador de Judô; Preparador físico de atletas de modalidades esportivas de combate.
Arquivo do blog
- ► 2012 (168)
- ► 2011 (203)
domingo, 28 de agosto de 2011
sábado, 27 de agosto de 2011
segunda-feira, 22 de agosto de 2011
Artigo na Science indica uso de artes marciais para melhoria da função executiva de crianças
Science. 2011 Aug 19;333(6045):959-64.
Interventions shown to aid executive function development in children 4 to 12 years old.
Diamond A, Lee K.
SourceUniversity of British Columbia and Children's Hospital, Vancouver, BC V6T 2A1, Canada. adele.diamond@ubc.ca
Abstract
To be successful takes creativity, flexibility, self-control, and discipline. Central to all those are executive functions, including mentally playing with ideas, giving a considered rather than an impulsive response, and staying focused. Diverse activities have been shown to improve children's executive functions: computerized training, noncomputerized games, aerobics, martial arts, yoga, mindfulness, and school curricula. All successful programs involve repeated practice and progressively increase the challenge to executive functions. Children with worse executive functions benefit most from these activities; thus, early executive-function training may avert widening achievement gaps later. To improve executive functions, focusing narrowly on them may not be as effective as also addressing emotional and social development (as do curricula that improve executive functions) and physical development (shown by positive effects of aerobics, martial arts, and yoga).
Interventions shown to aid executive function development in children 4 to 12 years old.
Diamond A, Lee K.
SourceUniversity of British Columbia and Children's Hospital, Vancouver, BC V6T 2A1, Canada. adele.diamond@ubc.ca
Abstract
To be successful takes creativity, flexibility, self-control, and discipline. Central to all those are executive functions, including mentally playing with ideas, giving a considered rather than an impulsive response, and staying focused. Diverse activities have been shown to improve children's executive functions: computerized training, noncomputerized games, aerobics, martial arts, yoga, mindfulness, and school curricula. All successful programs involve repeated practice and progressively increase the challenge to executive functions. Children with worse executive functions benefit most from these activities; thus, early executive-function training may avert widening achievement gaps later. To improve executive functions, focusing narrowly on them may not be as effective as also addressing emotional and social development (as do curricula that improve executive functions) and physical development (shown by positive effects of aerobics, martial arts, and yoga).
Perda de peso e uso de suplementos entre wrestlers iranianos
Patterns of weight loss and supplement consumption of male wrestlers in Tehran
Ramin Kordi1*, Vahid Ziaee1, Mohsen Rostami1, William A Wallace2
Abstract
Background: To evaluate the weight loss behavior of male wrestlers in Tehran
Methods: This study was a population-based cross sectional survey. Subjects were 436 wrestlers randomly selected from the wrestling clubs in Tehran employing cluster sample setting method. Subjects were interviewed based on a designed questionnaire. Body fat levels were measured based on skin fold measurements.
Results: Weight loss methods practiced by 62% of all subjects during the previous year employing rapid (≤7 days before the matches) and gradual (>7 days before the matches) weight reduction methods (73% and 34% of wrestlers who reduced their weight respectively). In addition, opinions on weight reduction, the methods of weight loss used, and the side effects of the weight loss practices as well as consumption of supplements among the subjects were reported in this study. The mean percentage of body fat of subjects was 15.9%. Conclusions: Rapid weight loss for matches and the use of unsafe methods of weight reduction such as fasting, and fluid reduction methods as well as acute side effects of weight loss were prevalent among wrestlers in Tehran. Some preventive measures including education and new rules such as scheduling weigh-ins immediately prior to the competitions and mat-side weigh-in are needed to prevent these unhealthy practices. The weight loss behaviors of these wrestlers should be changed from using dehydration methods to using gradual methods of weight loss.
http://www.springerlink.com/content/c48727205u116275/fulltext.pdf
Ramin Kordi1*, Vahid Ziaee1, Mohsen Rostami1, William A Wallace2
Abstract
Background: To evaluate the weight loss behavior of male wrestlers in Tehran
Methods: This study was a population-based cross sectional survey. Subjects were 436 wrestlers randomly selected from the wrestling clubs in Tehran employing cluster sample setting method. Subjects were interviewed based on a designed questionnaire. Body fat levels were measured based on skin fold measurements.
Results: Weight loss methods practiced by 62% of all subjects during the previous year employing rapid (≤7 days before the matches) and gradual (>7 days before the matches) weight reduction methods (73% and 34% of wrestlers who reduced their weight respectively). In addition, opinions on weight reduction, the methods of weight loss used, and the side effects of the weight loss practices as well as consumption of supplements among the subjects were reported in this study. The mean percentage of body fat of subjects was 15.9%. Conclusions: Rapid weight loss for matches and the use of unsafe methods of weight reduction such as fasting, and fluid reduction methods as well as acute side effects of weight loss were prevalent among wrestlers in Tehran. Some preventive measures including education and new rules such as scheduling weigh-ins immediately prior to the competitions and mat-side weigh-in are needed to prevent these unhealthy practices. The weight loss behaviors of these wrestlers should be changed from using dehydration methods to using gradual methods of weight loss.
http://www.springerlink.com/content/c48727205u116275/fulltext.pdf
sábado, 20 de agosto de 2011
sexta-feira, 19 de agosto de 2011
EMG em boxeadoras
Zhongguo Ying Yong Sheng Li Xue Za Zhi. 2011 May;27(2):253-6.
Women boxing athletes' EMG of upper limbs and lumbar muscles in the training of air striking of straight punch
[Article in Chinese]
Zhang RH, Kang ZX.
Department of Human Sports Science, Shenyang Sport University, Shenyang 110102, China. rhzhang75@yahoo.com.cn
Abstract
OBJECTIVE: To study training effect of upper limbs and lumbar muscles in the proceed of air striking of straight punch by analyzing boxing athletes' changes of electromyogram (EMG).
METHODS: We measured EMG of ten women boxing athletes' upper arm biceps (contractor muscle), upper arm triceps (antagonistic muscle), forearm flexor muscle (contractor muscle), forearm extensor muscle (antagonistic muscle), and lumbar muscles by ME6000 (Mega Electronics Ltd.). The stipulated exercise was to do air striking of straight punch with loads of 2.5 kg of dumbbell in the hand until exhausted.
RESULTS: In the proceed of exercise-induce exhausted, the descend magnitude and speed of median frequency (MF) in upper limb antagonistic muscle exceeded to contracting muscle, moreover, the work percentage showed that contractor have done a larger percentage of work than antagonistic muscle. Compared with world champion's EMG, the majority of ordinary athletes' lumbar muscles MF revealed non-drop tendency, and the work percentage showed that lumbar muscles had a very little percentage of work.
CONCLUSION: After comparing the EMG test index in upper limb and lumbar muscle of average boxing athletes with that of the world champion, we find the testees lack of the training of upper limb antagonistic muscle and lumbar muscle, and more trainings aimed at these muscles need to be taken.
Women boxing athletes' EMG of upper limbs and lumbar muscles in the training of air striking of straight punch
[Article in Chinese]
Zhang RH, Kang ZX.
Department of Human Sports Science, Shenyang Sport University, Shenyang 110102, China. rhzhang75@yahoo.com.cn
Abstract
OBJECTIVE: To study training effect of upper limbs and lumbar muscles in the proceed of air striking of straight punch by analyzing boxing athletes' changes of electromyogram (EMG).
METHODS: We measured EMG of ten women boxing athletes' upper arm biceps (contractor muscle), upper arm triceps (antagonistic muscle), forearm flexor muscle (contractor muscle), forearm extensor muscle (antagonistic muscle), and lumbar muscles by ME6000 (Mega Electronics Ltd.). The stipulated exercise was to do air striking of straight punch with loads of 2.5 kg of dumbbell in the hand until exhausted.
RESULTS: In the proceed of exercise-induce exhausted, the descend magnitude and speed of median frequency (MF) in upper limb antagonistic muscle exceeded to contracting muscle, moreover, the work percentage showed that contractor have done a larger percentage of work than antagonistic muscle. Compared with world champion's EMG, the majority of ordinary athletes' lumbar muscles MF revealed non-drop tendency, and the work percentage showed that lumbar muscles had a very little percentage of work.
CONCLUSION: After comparing the EMG test index in upper limb and lumbar muscle of average boxing athletes with that of the world champion, we find the testees lack of the training of upper limb antagonistic muscle and lumbar muscle, and more trainings aimed at these muscles need to be taken.
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