1,382 research outputs found
Sex differences in countermovement jump phase characteristics
The countermovement jump (CMJ) is commonly used to explore sex differences in neuromuscular function, but previous studies have only reported gross CMJ measures or have partly examined CMJ phase characteristics. The purpose of this study was to explore differences in CMJ phase characteristics between male and female athletes by comparing the force-, power-, velocity-, and displacement-time curves throughout the entire CMJ, in addition to gross measures. Fourteen men and fourteen women performed three CMJs on a force platform from which a range of kinetic and kinematic variables were calculated via forward dynamics. Jump height (JH), reactive strength index modified, relative peak concentric power, and eccentric and concentric displacement, velocity, and relative impulse were all greater for men (g = 0.58–1.79). Relative force-time curves were similar between sexes, but relative power-, velocity-, and displacement-time curves were greater for men at 90%–95% (immediately before and after peak power), 47%–54% (start of eccentric phase) and 85%–100% (latter half of concentric phase), and 65%–87% (bottom of countermovement and initial concentric phase) of normalized jump time, respectively. The CMJ distinguished between sexes, with men demonstrating greater JH through applying a larger concentric impulse and, thus, achieving greater velocity throughout most of the concentric phase, including take-off
On highest-energy state in the su(1|1) sector of N=4 super Yang-Mills theory
We consider the highest-energy state in the su(1|1) sector of N=4 super
Yang-Mills theory containing operators of the form tr(Z^{L-M} \psi^M) where Z
is a complex scalar and \psi is a component of gaugino. We show that this state
corresponds to the operator tr(\psi^L) and can be viewed as an analogue of the
antiferromagnetic state in the su(2) sector. We find perturbative expansions of
the energy of this state in both weak and strong 't Hooft coupling regimes
using asymptotic gauge theory Bethe ansatz equations. We also discuss a
possible analog of this state in the conjectured string Bethe ansatz equations.Comment: 23 pages, Late
Is peer support in group clinics as effective as traditional individual appointments? The first study in patients with Celiac disease
INTRODUCTION:
Celiac disease (CD) is common, affecting approximately 1% of the population. The cornerstone of management is a gluten-free diet, with dietetic advice being the key to aiding implementation. The aim of the study was to assess group clinics in comparison with traditional individual appointments.
METHODS:
Patients with a new diagnosis of CD, confirmed histologically, were prospectively recruited over 18 months in Sheffield, United Kingdom. Patients received either a group clinic or traditional one-to-one appointment, led by a dietitian. Quality-of-life questionnaires were completed at baseline, as well as biochemical parameters being recorded. Patients were followed up at 3 months, where adherence scores were assessed as well as biochemical parameters and quality of life questionnaires being completed.
RESULTS:
Sixty patients with CD were prospectively recruited and received either an individual (n = 30) or group clinic (n = 30). A statistically significant reduction in tissue transglutaminase was noted following group clinics (mean 58.5, SD 43.4 U/mL vs mean 13.2, SD 5.7 U/mL, P < 0.01). No significant differences in baseline and follow-up biochemical parameters between one-to-one and group clinics were noted. At follow-up, there was no statistically significant difference between mean gluten-free diet adherence scores (mean 3.1, SD 0.4 vs mean 3.1, SD 0.7, P = 0.66) between one-to-one and group clinics.
DISCUSSION:
This first study assessing group clinics in CD demonstrates they are as effective as traditional one-to-one clinics, with the added benefits of peer support and greater efficiency, with an estimated 54% reduction of dietetic resources
Operator with large spin and spinning D3-brane
We consider the conformal dimension of an operator with large spin, using a
spinning D3-brane with electric flux in AdS_5 x S^5 instead of spinning
fundamental string. This spinning D3-brane solution seems to correspond to an
operator made by taking trace in a large symmetric representation. The
conformal dimension, the spin and the R-charge show a scaling relation in a
certain region of parameters. In the small string charge limit, the result is
consistent with the fundamental string picture. There is a phase transition
when the fundamental string charge become larger than a certain critical value;
there is no stable D3-brane solution above the critical value.Comment: 16 pages, 4 figures. v2: typos corrected, references added, series
expansion of anomalous dimension added. v3: a reference added, comment on
calculation in gauge theor
AdS/CFT duality at strong coupling
We study the strong coupling limit of AdS/CFT correspondence in the framework
of a recently proposed fermionic formulation of the Bethe Ansatz equations
governing the gauge theory anomalous dimensions. We provide examples of states
that do not follow the Gubser-Klebanov-Polyakov law at large 't Hooft coupling
, in contrast with recent results on the quantum string Bethe
equations valid in that regime. This result indicates that the fermionic
construction cannot be trusted at large , although it remains an
efficient tool to compute the weak coupling expansion of anomalous dimensions.Comment: Presented at Nonlinear Physics. Theory and Experiment. IV Gallipoli,
June 22 - July 1, 2006. To appear in the proceeding
A Generalized Scaling Function for AdS/CFT
We study a refined large spin limit for twist operators in the sl(2) sector
of AdS/CFT. We derive a novel non-perturbative equation for the generalized
two-parameter scaling function associated to this limit, and analyze it at weak
coupling. It is expected to smoothly interpolate between weakly coupled gauge
theory and string theory at strong coupling.Comment: 27 pages, no figures; v2: references added and typos fixe
On AdS_5 x S^5 String S-matrix
Recently two interesting conjectures about the string S-matrix on AdS_5 x S^5
have been made. First, assuming the existence of a Hopf algebra symmetry Janik
derived a functional equation for the dressing factor of the quantum string
Bethe ansatz. Second, Hernandez and Lopez proposed an explicit form of
1/\sqrt\lambda correction to the dressing factor. In this note we show that in
the strong coupling expansion Janik's equation is solved by the dressing factor
up to the order of its validity. This observation provides a strong evidence in
favor of a conjectured Hopf algebra symmetry for strings in AdS_5 x S^5 as well
as the perturbative string S-matrix.Comment: 10 pages, version2: misprints are correcte
World-sheet scattering in AdS_5 x S^5 at two loops
We study the AdS_5 x S^5 sigma-model truncated to the near-flat-space limit
to two-loops in perturbation theory. In addition to extending previously known
one-loop results to the full SU(2|2)^2 S-matrix we calculate the two-loop
correction to the dispersion relation and then compute the complete two-loop
S-matrix. The result of the perturbative calculation can be compared with the
appropriate limit of the conjectured S-matrix for the full theory and complete
agreement is found.Comment: 26pages, 3 figure
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