排序方式： 共有28条查询结果，搜索用时 218 毫秒
1.
2.
Franck Brocherie Olivier Girard Fabricio Forchino Hani Al Haddad Gilvan A. Dos Santos Grégoire P. Millet 《Journal of sports sciences》2014,32(13):1243-1254
AbstractThe aim of this study was to determine potential relationships between anthropometric parameters and athletic performance with special consideration to repeated-sprint ability (RSA). Sixteen players of the senior male Qatar national soccer team performed a series of anthropometric and physical tests including countermovement jumps without (CMJ) and with free arms (CMJwA), straight-line 20 m sprint, RSA (6 × 35 m with 10 s recovery) and incremental field test. Significant (P < 0.05) relationships occurred between muscle-to-bone ratio and both CMJs height (r ranging from 0.56 to 0.69) as well as with all RSA-related variables (r < –0.53 for sprinting times and r = 0.54 for maximal sprinting speed) with the exception of the sprint decrement score (Sdec). The sum of six skinfolds and adipose mass index were largely correlated with Sdec (r = 0.68, P < 0.01 and r = 0.55, P < 0.05, respectively) but not with total time (TT, r = 0.44 and 0.33, P > 0.05, respectively) or any standard athletic tests. Multiple regression analyses indicated that muscular cross-sectional area for mid-thigh, adipose index, straight-line 20 m time, maximal sprinting speed and CMJwA are the strongest predictors of Sdec (r2 = 0.89) and TT (r2 = 0.95) during our RSA test. In the Qatar national soccer team, players’ power-related qualities and RSA are associated with a high muscular profile and a low adiposity. This supports the relevance of explosive power for the soccer players and the larger importance of neuromuscular qualities determining the RSA. 相似文献
3.
Many of the socio-cultural lifestyle and dietary changes that take place during Ramadan may affect the risk of injury in athletes, but little evidence is available. The aim of the present study was to examine the effects over two consecutive years of the holy month of Ramadan on injury rates in 42 professional players of a Tunisian top-level professional soccer team. Players were retrospectively organized into fasting and non-fasting groups and monitored for 3 months: 4 weeks before Ramadan, during the month of Ramadan (4 weeks), and 4 weeks after Ramadan each year. During Ramadan, training started at 22.00 h. The circumstances (training/match) and mechanism of injury (traumatic/overuse) were recorded. No significant differences between the three periods were observed for weekly mean training load, training strain, training duration, and Hooper's Index (quality of sleep, and quantities of stress, delayed-onset muscle soreness, and fatigue). Compared with non-fasting players, fasters had a lower (P < 0.05) Hooper's Index and stress during and after Ramadan. No significant difference in injury rates was observed between fasting and non-fasting players. Nevertheless, the rates of non-contact (6.8 vs. 0.6 and 1.1) and training overuse (5.6 vs. 0.6 and 0.5) injuries were significantly higher in fasting players during the month of Ramadan than before or after Ramadan. In conclusion, Ramadan, along with the corresponding changes in nutritional habits, sleeping schedule, and socio-cultural and religious events, significantly increased overuse and non-contact injuries in fasting players despite the fact that the training load, strain, and duration were maintained. 相似文献
4.
Twenty-eight male albino rats were given a single 4-sec 1-mA electric-grid-shock unconditioned stimulus (US). In the same session they received two 12-sec conditioned stimuli (CSs). One CS (explicitly unpaired) terminated 180 sec before the US began; the other (backward paired) began immediately after the US terminated. The CSs used were a 1000-Hz 85-dB tone and an 84-dB click; their roles were counterbalanced. Over the next 2 days, each CS was presented for 2 min while the rats drank from a water bottle. The backward-paired CS was found to suppress licking more than the explicitly unpaired CS. This suppression was accompanied by an increase in defensive behavior (freezing and freeze/nod) and by a decrease in other activity. The suppression did not seem to be due to a maintained or enhanced CS-orienting response reflex, nor could it be attributed to an adventitiously reinforced interfering operant. The results support the presumption made in previous reports that the lick suppression evoked by a backward CS reflected one-trial backward excitatory fear conditioning. 相似文献
5.
Afaf Haddad 《International journal for the advancement of counseling》1998,20(2):113-121
This study aimed at investigating which source of social support (supervisors, colleagues, friends, spouse, family) would be most effective in reducing burnout among school counsellors. A sample of 90 counsellors (47 males and 43 females) completed Burnout and Source of Social Support questionnaires. Pearson correlation coefficients and ANOVA were employed to analyze data. Results revealed significant positive correlations between family support, colleague support, and personal accomplishment. Demographic variables: sex, age, marital status, and counselling experience were not significantly related to any of the three burnout dimensions. Results were interpreted and implications for counselling were suggested. 相似文献
6.
Georges Haddad Jean-Pierre Aubin 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2013,59(3):331-341
This article begins by looking at two reports, commissioned in the second half of the 20th century to investigate the impact of social change on education and to propose strategies for tackling new challenges arising from this. The first report, published in 1972, was the so-called Faure report (named after French lawyer and politician Edgar Faure), and the second one, published in 1996, was the so-called Delors report (named after French economist and politician Jacques Delors). Using these two reports as their starting point, the authors of this paper consider the effects of modern information technology on our cultural environment. Today we are experiencing an increasingly virtual world with very real effects. This paper argues that Edgar Faure already foresaw the emergence of a new cultural world in which virtuality would both add to and compete with reality. The authors stress that now, more than ever, access to lifelong education needs to be ensured for everyone, permanently enriched by research and innovation, addressing creativity and entrepreneurship, in addition to continuously evolving skills and competences. 相似文献
7.
Xianlin Zeng Qing Hui Wassim M. Haddad Tomohisa Hayakawa James M. Bailey 《Journal of The Franklin Institute》2014
With advances in biochemistry, molecular biology, and neurochemistry there has been impressive progress in the understanding of the molecular properties of anesthetic agents. However, despite these advances, we still do not understand how anesthetic agents affect the properties of neurons that translate into the induction of general anesthesia at the macroscopic level. There is extensive experimental verification that collections of neurons may function as oscillators and the synchronization of oscillators may play a key role in the transmission of information within the central nervous system. This may be particularly relevant to understand the mechanism of action for general anesthesia. In this paper, we develop a stochastic synaptic drive firing rate model for an excitatory and inhibitory cortical neuronal network in the face of system time delays and stochastic input disturbances. In addition, we provide sufficient conditions for global asymptotic and exponential mean-square synchronization for this model. 相似文献
8.
9.
Wadi D. Haddad 《比较教育学》1981,17(2):127-139
10.
GholamReza Keshavarz Haddad 《Journal of Education & Work》2017,30(6):612-631
In the framework of a household’s collective decision processes, this study presents a structural empirical model to test the hypothesis that child labour is compelled by household’s poverty and parent’s bargaining power against one another. To this end, a measure for mother’s intra-household bargaining power is developed. I use Iranian Household’s Income and Expenditures Surveys (2005 and 2010). Estimation method used in this study is multinomial logit. Findings indicate that household’s poverty is not the sole cause of child’s work incidence. Instead, given the other factors such as poverty, being the first born, local labour market prospect and gender fixed, mother’s bargaining power is found as a significant determinant of child’s work and school attendance. However, the magnitude of its marginal effects vary by gender and across geographical areas. 相似文献