214 research outputs found
Influence of the number of trials and the exercise to rest ratio in repeated sprint ability, with changes of direction and orientation
The purpose of this
investigation was to determine if there were different trends in
physical fatigue observed in 3 different sets, of 7 trials each, in
repeated sprint training, performed in 3 different modes: straight
sprinting over 30 m, shuttle sprinting over 15 + 15 m, and sprinting
over 30 m with changes of direction. Recovery time among trials in the
sets was administered according to the 1:5 exercise to rest ratio. The
sets were performed on 3 different days, with at least 48 hours between
each set. The study involved 17 trained male soccer players (height,
177.33 +/- 6.21 cm; body mass, 71.63 +/- 9.58 kg; body mass index, 23
+/- 2.39 kg<bold>m(</bold>-2); age, 21.94 +/- 3.58 years). To compare
the different values of the time recorded, an index of fatigue was used.
Significant differences among trials within each set (repeated measures
analysis of variance; p < 0.05) and between the sets (factorial analysis
of variance; p < 0.001) were found. Significant correlations between
each test and countermovement jump and stiffness values recorded pre
exercise were found (p < 0.05). Significant differences between
countermovement jump and stiffness values recorded pre and post exercise
were also found (p < 0.05). This study suggests that training sessions
aimed at increasing the capacity of repeated sprint ability in nonlinear
and multidirectional sprints (shuttle and change of direction), which
might imply a different number of trials within the set or different
exercise to rest ratios from the ones usually adopted for straight
sprinting, to induce similar trends of fatigue. As practical
applications, the estimated numbers of necessary trials in the different
sets and the possible exercise to rest ratios, resulting from
mathematical modeling, are provided for each investigated sprinting
mode
Intrauterine versus post-mortem magnetic resonance in second trimester termination of pregnancy for central nervous system abnormalities
Objective: To evaluate if limiting factors of intrauterine magnetic resonance imaging (iuMRI) performed in the early second trimester of pregnancy (19\u201323 weeks) affect its accuracy in comparison to post-mortem MRI (pmMRI) in fetuses that underwent termination of pregnancy (TOP) for central nervous system (CNS) defects. Study design: This is a secondary analysis of a 10 years prospective observational study. Cases of TOP < 23 weeks for CNS malformation that had undergone neurosonography (NSG), iuMRI, pmMRI and autopsy were included. The agreement between iuMRI and pmMRI was calculated. The autopsy represented the gold-standard. Results: Overall, 143 TOPs for fetal congenital anomaly underwent the post-mortem diagnostic protocol. Of these, 31 cases underwent iuMRI and pmMRI for CNS abnormality. Three cases were excluded due to brain autolysis at autopsy. Corpus callosum defects were the most represented (16/28; 57 %). In only one case of posterior fossa defect, pmMRI identified the presence of vermian hypoplasia not diagnosed at iuMRI. In 2 cases (7%), iuMRI added clinically relevant additional findings to NSG, that were posteriorly confirmed by pmMRI. Conclusions: The study shows that, at 19\u201323 weeks and for CNS defects, limiting factors that might influence the performance of iuMRI have little influence on iuMRI accuracy. This finding is particularly important for professionals who work in countries with legal bound for TOP in the early second trimester
ATR Commissioning Software Task Force Report
The Beam Injection Test Software Task Force was Charged with Studying software needed for the ATR Test, seen as a stepping stone or template for the larger scope for the full RHIC control system. This report outlines our avenues of exploration so far, present the current analysis and implementation work in progress, and gives recommendation for the future on the ATR and longer time scales
Circulating TRAIL Shows a Significant Post-Partum Decline Associated to Stressful Conditions
Background: Since circulating levels of TNF-related apoptosis inducing ligand (TRAIL) may be important in the physiopathology of pregnancy, we tested the hypothesis that TRAIL levels change at delivery in response to stressful conditions. Methods/Principal Findings: We conducted a longitudinal study in a cohort of 73 women examined at week 12, week 16, delivery and in the corresponding cord blood (CB). Serum TRAIL was assessed in relationship with maternal characteristics and to biochemical parameters. TRAIL did not vary between 12 (67.6627.6 pg/ml, means6SD) and 16 (64.0616.2 pg/ml) weeks ’ gestation, while displaying a significant decline after partum (49.3626.4 pg/ml). Using a cut-off decline.20 pg/ml between week 12 and delivery, the subset of women with the higher decline of circulating TRAIL (41.7%) showed the following characteristics: i) nullipara, ii) higher age, iii) operational vaginal delivery or urgent CS, iv) did not receive analgesia during labor, v) induced labor. CB TRAIL was significantly higher (131.6652 pg/ml) with respect to the corresponding maternal TRAIL, and the variables significantly associated with the first quartile of CB TRAIL (,90 pg/ml) were higher prepregnancy BMI, induction of labor and fetal distress. With respect to the biochemical parameters, maternal TRAIL at delivery showed an inverse correlation with C-reactive protein (CRP), total cortisol, glycemia and insulin at bivariate analysis, but only with CRP at multivariate analysis
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RHIC Polarized proton performance in run-8
During Run-8, the Relativistic Heavy Ion Collider (RHIC) provided collisions of spin-polarized proton beams at two interaction regions. Physics data were taken with vertical orientation of the beam polarization, which in the 'Yellow' RHIC ring was significantly lower than in previous years. We present recent developments and improvements as well as the luminosity and polarization performance achieved during Run-8, and we discuss possible causes of the not as high as previously achieved polarization performance of the 'Yellow' ring
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RHIC Performance for FY2011 Au+Au Heavy Ion Run
Following the Fiscal Year (FY) 2010 (Run-10) Relativistic Heavy Ion Collider (RHIC) Au+Au run, RHIC experiment upgrades sought to improve detector capabilities. In turn, accelerator improvements were made to improve the luminosity available to the experiments for this run (Run-11). These improvements included: a redesign of the stochastic cooling systems for improved reliability; a relocation of 'common' RF cavities to alleviate intensity limits due to beam loading; and an improved usage of feedback systems to control orbit, tune and coupling during energy ramps as well as while colliding at top energy. We present an overview of changes to the Collider and review the performance of the collider with respect to instantaneous and integrated luminosity goals. At the conclusion of the FY 2011 polarized proton run, preparations for heavy ion run proceeded on April 18, with Au+Au collisions continuing through June 28. Our standard operations at 100 GeV/nucleon beam energy was bracketed by two shorter periods of collisions at lower energies (9.8 and 13.5 GeV/nucleon), continuing a previously established program of low and medium energy runs. Table 1 summarizes our history of heavy ion operations at RHIC
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