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Participating in sports has been shown to promote overall wellness and, at the same time, reduce health risks. As more people are participating in sports, competitions have increased, and every aspect of the game has been focused by coaches and athletes in order to improve performance. One of these aspects is the warm-up session. The purpose of this study was to investigate the acute effect of a dynamic warm-up versus a proprioceptive neuromuscular facilitation (PNF) warm-up on the sprint and jump performance of recreationally active men. Thirty (n = 30) males were randomly assigned to undergo three sessions of different warm-up types, 72 h apart, involving either proprioceptive neuromuscular facilitation (PNF), dynamic stretching (DS), or no stretching session (control). The PNF and dynamic modes of stretching improved vertical jump performance, F (2.58) = 5.49, = 0.046, to a certain extent (mean + 3.32% vs. control, = 0.002 for dynamic and mean + 1.53% vs. control, = 0.048 for PNF stretching). Dynamic stretching is best used to get a better vertical jump height. Sprint performance was also increased to a greater extent following the stretching session, F (2.58) = 5.60, = 0.01. Sprint time was +1.05% faster vs. the control, with a value of = 0.002 after dynamic stretching, while PNF stretching demonstrated a sprint time of +0.35% vs. the control, with a value of = 0.049. Dynamic stretching showed a better sprint performance and also vertical jump height performance in this study. PNF and dynamic stretching prove to be equally efficacious in flexibility conditioning depending on the type of movement involved. This type of stretching should be utilized to help preserve or improve the performance output of physical activity, especially in sprinting and jumping events.
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http://dx.doi.org/10.3390/jfmk9010042 | DOI Listing |
ACS Appl Mater Interfaces
September 2025
State Key Laboratory of Chemical Resource Engineering, Beijing 100029, China.
Circularly polarized luminescence (CPL) has emerged as a critical technology for anticounterfeiting and optical display applications due to its unique chiroptical properties. We report a multicolor CPL-emitting elastomeric film (P37/PSK@SiO-PDMS) that synergistically combines chiral helical polyacetylene (P37) and a surface-engineered perovskite (PSK@SiO) through hydrogen-bond-directed assembly. Confinement within the PDMS matrix drives P37 to self-assemble into a chiral supramolecular structure through hydrogen bonding, inducing a chiroptical inversion.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
September 2025
Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou, 310058, P.R. China.
Mechanoresponsive molecular devices are capable of exhibiting dynamic responses to external mechanical stimuli, enabling applications in smart materials, nano-devices, and flexible electronics. However, energy conversion induced by mechanical stimuli requires efficient energy dissipation mechanisms. Traditional methods often involve bond breaking or incomplete energy release, which can lead to device failure during continuous operations.
View Article and Find Full Text PDFRev Sci Instrum
September 2025
Leiden Institute of Physics, Leiden University, 2333CC Leiden, The Netherlands.
Whether at the molecular or cellular scale in organisms, cell-cell adhesion adapts to external mechanical cues arising from the static environment of cells and from dynamic interactions between neighboring cells. Cell-cell adhesion needs to resist detachment forces to secure the integrity and internal organization of organisms. In the past, various techniques have been developed to characterize adhesion properties of molecules and cells in vitro and to understand how cells sense and probe their environment.
View Article and Find Full Text PDFUnlabelled: Plasma membrane (PM) lipids and proteins are organized into nanoscale regions called nanodomains, which regulate essential cellular processes by controlling local membrane organization. Despite advances in super-resolution microscopy and single particle tracking, the small size and temporal instability of nanodomains make them difficult to study in living cells. To overcome these challenges, we built fluorescent DNA origami probes that insert into the PM via lipid anchors displayed on the cell.
View Article and Find Full Text PDFInorg Chem
September 2025
Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.
The nominally trigonal, pseudo-Jahn-Teller (PJT)-active, = 1/2 N-bound complexes, , M = Fe, Co, with three in-plane phosphine ligands and axial donors, E = Si, B, C, include functional nitrogenase models that catalyze the reduction of N to NH. We applied EPR, P ENDOR spectroscopy, and DFT computations to characterize the PJT-induced distortions of four selected , revealing how the metal ion and axial ligand E together tune both PJT dynamics, as revealed by P ENDOR and N activation, as indicated by a decrease in N≡N stretching frequency, ν(N≡N). , and each exhibit a single P isotropic hyperfine coupling, revealing dynamic pseudorotation of the PJT distortion, producing averaged symmetry with equivalent phosphine ligands.
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