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Comparison of 1 and 2 days per week of strength training in children   总被引:1,自引:0,他引:1  
The purpose of this study was to compare the effects of 1 and 2 days per week of strength training on upper body strength, lower body strength, and motor performance ability in children. Twenty-one girls and 34 boys between the ages of 7.1 and 12.3 years volunteered to participate in this study. Participants strength trained either once per week (n = 22) or twice per week (n = 20) for 8 weeks at a community-based youth fitness center. Each training session consisted of a single set of 10-15 repetitions on 12 exercises using child-size weight machines. Thirteen children who did not strength train served as age-matched controls. One repetition maximum (1RM) strength on the chest press and leg press, handgrip strength, long jump, vertical jump, and flexibility were assessed at baseline and posttraining. Only participants who strength trained twice per week made significantly greater gains in 1RM chest press strength, compared to the control group (11.5 and 4.4% respectively, p < .05). Participants who trained once and twice per week made gains in 1RM leg press strength (14.2 and 24.7%, respectively) that were significantly greater than control group gains (2.4%). On average, participants who strength trained once per week achieved 67% of the 1RM strength gains. No significant differences between groups were observed on other outcome measures. These findings support the concept that muscular strength can be improved during the childhood years and favor a training frequency of twice per week for children participating in an introductory strength training program.  相似文献   
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When the Normans conquered southern Italy and Sicily during the eleventh century, a significant part of the population were Greek-rite Christians (mainly in southern Apulia, Calabria and north-east Sicily) or, on the island of Sicily, Muslims. To begin with, at least, it was very much in the interests of the new rulers to tolerate these groups, and hence the reputation of the Norman kingdom of Sicily for its diversity and multi-culturalism. But over the next two centuries this consensus slowly dissolved, the position of the Greek and Muslim communities weakened, and ultimately both disappeared. However, while with the Greeks much of the pressure for acculturation and Latinisation was unconscious and unintended, and the decline of the Greek rite and contraction of the Graecophone areas were very slow, the Muslims of Sicily were provoked into revolt at the end of the twelfth century, and had been almost entirely eliminated from the island by 1250. It has usually been assumed that most of the Muslims of Sicily were deported to Frederick II’s military colony at Lucera in the Capitanata. Yet when examined closely, this thesis seems improbable, and what happened to the Sicilian Muslims remains an enigma.  相似文献   
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