892 research outputs found
Effects of Squat Flywheel Training on Strength, Muscle Structure and Performance.
No full textPurpose: Inertial flywheel device (YoYo Technology) is well known to induce strength adaptations and increase muscle mass after short term training. (Norrbrand 2011, Tesch 2004). Changes in muscle architectural parameters appropriate to improve peak torque has been described (Seynnes, 2007). However these adaptations were not directly related to specific performances like jump, velocity and change direction ability. Aim of the study is to evaluate quadriceps strength and architecture, lower limb fat free mass, and performance parameters after short term YoYo squat training.
Methods: 31 healthy young males has been randomly assigned at training (TR) or control (CON) group. TR underwent 16 training sessions in 9 weeks each consisting in 60 maximal reps at YoYo squat. Maximal Voluntary Contraction (MVC), Fat Free Mass (FFM), Fascicle length and thickness, Squat Jump (SJ) and Countermovement Jump (CMJ) Height and time on 30m dash and 20m shuttle have been measured pre and post training. Analysis of covariate has been done after log transformation.
Results: Compare to CON, TR showed higher MVC isometric (avg 25%, CI 95 13% to 38%), concentric (10%, 2%to 19%), eccentric (9%, 2% to 17%) extension (for each parameters, p<0,01). In TR, FFM (4%, 1% to 7%), fascicle length (8%, 1% to 16%), fascicle thickness (6%, 1% to 15%) increased compare to CON (p<0,01). SJ (9%, 2% to 16%), CMJ (8%, 1% to 14%), 20m shuttle(-4%, -7% to -1%) significantly improve (p<0,05) in TR compare to CON. 30m dash did not improve significantly compare to CON(-1%, -4% to2%, p=0,445), indicating that 20m shuttle performance is specially due by an augmented control of decreasing and increasing speed.
Conclusion: Augmented strength and changed muscle structure are in agreement with previous study. Longer fascicle is correlated with higher velocity of sarcomere contraction (Blazevich 2006). Outcomes show positive transfers in sport performance tasks, like jumping or braking and change sprinting direction. Flywheel device can be successfully used to improve performance in sport in which jumping or speed are key factors.
Blazevich A.J.,et al. J Anat 2006, 209:289–310
Norrbrand L, et al. Aviat Space and Environ Med 2011,82(1):13-9.
Seynnes OR, et al J. Appl Physiol 2007, 102(1):368-73.
Tesch PA, et al. Acta Physiol Scand 2004, 180(1):89-98
G2 & G1 plants species of SW Colorado
No full textPresented at the 16th symposium held on September 27, 2019 in Grand Junction, Colorado.2019 G2 species of SW Colorado -- 2019 G1 species of SW Colorado
APPROXIMATE G1 ORBITALS
No full text W. A. Goddard, 111, Phys. Rev. 174, 659 (1968) V. Kaldor, J. Chem. Phys. 48 , 835 (1968) P. O. Lowdin and H. shull, Phys. Rev. 101, 1730 (1956)Author Institution:A generalized valence bond approach, the G1 method developed by , has several attractive features. For example, (1) it allows a single particle interpretation, (2) it yields the proper molecular dissociation, (3) it accounts for substantial part of the correlation energy, and (4) it produces an improved spin distribution near the nuclei. The G1 formulation, however, becomes unwieldy for systems with more than six electrons. To treat large systems, we have investigated an approximation to the G1 function. We expand the G1 symmetry operator and retain terms only to first order in electron exchange similar to kaldor’ treatment of the Hartree-Fock method. The natural orbital for each pair of G1 orbitals improves the convergence of this expansion. Our approximation is in the spirit similar to the Dirac-Van Vleck approach, but more general because our orbitals are nonorthogonal and are obtained variationally. We compare our results with those from exact G1 calculations for small atoms. Since the orbitals are nodeless, the G1 description should lead to unique well founded effective core potentials for application to large molecular structure calculations
Review of Colorado's threatened, endangered and G1 plant species
No full textSymposium held on September 8, 2017 in Colorado Springs, Colorado.Title from website.Colorado T, E & C plant species -- Colorado G1 species (excluding T, E & C species)
A transient increase of HIF-1alpha during the G1 phase (G1-HIF) ensures cell survival under nutritional stress.
No full textThe family of hypoxia-inducible transcription factors (HIF) is activated to adapt cells to low oxygen conditions, but is also known to regulate some biological processes under normoxic conditions. Here we show that HIF-1alpha protein levels transiently increase during the G1 phase of the cell cycle (designated as G1-HIF) in an AMP-activated protein kinase (AMPK)-dependent manner. The transient elimination of G1-HIF by a degron system revealed its contribution to cell survival under unfavorable metabolic conditions. Indeed, G1-HIF plays a key role in the cell cycle-dependent expression of genes encoding metabolic regulators and the maintenance of mTOR activity under conditions of nutrient deprivation. Accordingly, transient elimination of G1-HIF led to a significant reduction in the concentration of key proteinogenic amino acids and carbohydrates. These data indicate that G1-HIF acts as a cell cycle-dependent surveillance factor that prevents the onset of starvation-induced apoptosis. © 2023. The Author(s)
2nd annual Colorado rare plant symposium: G1 plants of Colorado: meeting minutes
No full textSymposium held on September 16, 2005 at the Pagosa Lodge in Pagosa Springs.Recorders: David G. Anderson, Jill Handwerk, Carol Winther, and Tom Grant.Includes minutes from the second Annual Colorado Rare Plant Symposium covering a review G1 plants of Colorado
Review of previous meetings, Part 1: Threatened and endangered, statewide G1 species
No full textSymposium held on September 23, 2016 in Boulder, Colorado.Title from website.2004/2011/2015 Colorado T, E & C plant species -- 2005/2010 Colorado G1 species (excluding T, E & C species)
Review of previous meetings, Part 2: Statewide G1, SE Colorado G2 species
No full textSymposium held on October 3, 2014 in Fort Collins, Colorado.2005/2010 Pagosa Springs/Denver: statewide G1 species (excluding T, E & C species) -- 2006/2012 SE Colorado G2G3 species
Review of previous meetings, Part 1: Threatened and endangered, statewide G1 species
No full textSymposium held on September 11, 2015 in Golden, Colorado.Title from website.2004/2011/2015 Colorado T, E & C plant species -- 2005/2010 Colorado G1 species (excluding T, E & C species)
Portfolio Selection with Narrow Framing: Probability Weighting Matters
No full textThis paper extends the model with narrow framing suggested by Barberis and Huang (2009) to also account for probability weighting and a convex-concave value function in the specification of cumulative prospect theory preferences on narrowly framed assets. We show that probability weighting is needed in order that investors reduce their holding of narrowly framed risky assets in the presence of negative skewness and high Sharpe ratios, which are typical characteristics of stock index returns. The model with framing and probability weighting can thus explain the stock participation puzzle under realistic assumptions on stock market returns. We also show that a convex-concave value function generates wealth effects that are consistent with empirical observations on stock market participation. Finally, we address the asset pricing implications of probability weighting in the model with narrow framing and show that in the case of negative skewness the equity premium of narrowly framed assets is much higher than when probability weighting is not taken into account.Narrow framing, cumulative prospect theory, probability weighting function,negative skewness, simulation methods
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