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Women Upward-Sex Differences in Uphill Performance in Speed Climbing, Ski Mountaineering, Trail Running, Cross-Country Skiing, and Cycling.
Int J Sports Physiol Perform
December 2024
School of Sport Science, UiT The Arctic University of Norway, Tromsø, Norway.
Introduction: Women have generally lower body size and lean- to fat-mass ratio, lower maximal anaerobic power due to a lower muscle mass, and fewer fast-twitch fibers, although they can show higher resistance to fatigue or greater metabolic flexibility than men. These factors are well known and explain the sex differences in endurance sports such as distance running (10%-12%). Several of these factors-particularly the differences in body composition and skeletal-muscle characteristics-may directly impact vertical displacement and uphill performance.
View Article and Find Full Text PDFWhole-body angular momentum during stair ascent and descent in individuals with and without knee osteoarthritis.
Sci Rep
December 2024
School of Health Sciences, Western Sydney University, Campbelltown, NSW, Australia.
Given the higher fall risk and the fatal sequelae of falls on stairs, it is worthwhile to investigate the mechanism of dynamic balance control in individuals with knee osteoarthritis during stair negotiation. Whole-body angular momentum ([Formula: see text]) is widely used as a surrogate to reflect dynamic balance and failure to constrain [Formula: see text] may increase the fall risk. This study aimed to compare the range of [Formula: see text] between people with and without knee osteoarthritis during stair ascent and descent.
View Article and Find Full Text PDFEvolution of Key Factors Influencing Performance Across Phases in Junior Short Sprints.
Sports (Basel)
November 2024
Faculty of Arts and Sciences, Kyoto Institute of Technology, Hashikami-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan.
Sprint performance plays a crucial role in various sports. Short sprints vary depending on the size of the court/playing field and on competitive characteristics, but are common in many sports. Although the relationship between age and muscle strength has been explored in short sprints, there is limited understanding of how various physical factors interact, particularly concerning differences in the acceleration phase.
View Article and Find Full Text PDFOptimizing active recovery strategies for finger flexor fatigue.
Front Sports Act Living
December 2024
Faculty of Physical Education and Sport, Charles University, Prague, Czech Republic.
Introduction: Active recovery (AR) is used during exercise training; however, it is unclear whether the AR should involve the whole body, only the upper extremities, or only the lower extremities when aiming to maintain localized upper body performance. Therefore, this study aimed to evaluate the impact of different AR strategies on repeated intermittent finger flexor performance leading to exhaustion.
Methods: A crossover trial involving a familiarization session and three laboratory visits, each including three exhaustive intermittent isometric tests at 60% of finger flexor maximal voluntary contraction separated by 22 min of randomly assigned AR: walking, intermittent hanging, and climbing.
3D-Porous Carbon Nitride Through Proton Regulation and Photocatalytic Synergy for Efficient Uranium Extraction From Seawater.
Small
December 2024
Key Laboratory of Photonic and Electronic Bandgap Materials Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin, 150025, China.
Extracting uranium from seawater is crucial for tapping oceanic resources vital to future energy supply. This study synthesized a novel nitrogen vacancy carbon nitride (NCN) grafted polyethyleneimine (PEI) composite material (NCNP). Experiments and molecular dynamics simulations reveal that NCNP effectively hinders the diffusion of uranyl ions (UO ) to the NCN surface, thereby inhibiting electron transfer reactions.
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