Hvers vegna er svona erfitt að greina náraverki íþróttamanna?

Efst á síðunni er hægt að nálgast greinina í heild sinni með því að smella á hlekkin

Markerless motion capture: What clinician-scientists need to know right now

National Institutes of Health R37-HD037985 provided tuition and stipend support for NI’s work. NIH R01-AR072034 provided stipend support for HBS and tuition and stipend support for KDS’s work. NIH F31-AR078580 and Foundation for Physical Therapy Research PODS II Scholarship provided tuition and stipend support for EKA's work.Peer reviewe

Don’t Peak Too Early : Evidence for an ACL Injury Prevention Mechanism of the 11+ Program

Funding Information: Research reported in this publication was supported by the National Institute of Arthritis and Musculoskeletal and Skin Diseases of the National Institutes of Health (award number R01AR072034). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. This work was also supported by grant R37-HD037985 from the National Institute of Health. This work was supported by the Ice-landic Research Fund, grant numbers 120410021, 903271305, 1203250031, and 185359051. Funding Information: Research reported in this publication was supported by the National Institute of Arthritis and Musculoskeletal and Skin Diseases of the National Institutes of Health (award number R01AR072034). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. This work was also supported by grant R37-HD037985 from the National Institute of Health. This work was supported by the Icelandic Research Fund, grant numbers 120410021, 903271305, 1203250031, and 185359051. Publisher Copyright: © 2022, North American Sports Medicine Institute. All rights reserved.Background The 11+ program prevents anterior cruciate ligament (ACL) injuries in athletes through unknown mechanisms. Purpose The aim of the current study was to evaluate the effects of The 11+ intervention program, performed by female soccer players during a single season, on the frequency of Early Peaks during athletic tasks. Methods Three teams (69 players) of collegiate female soccer athletes (Divisions I and II) were recruited. Two teams (49 players) volunteered to perform The 11+ three times per week for one season (~22 weeks plus three weeks pre-season), and one team (20 players) served as controls. The athletes performed three repetitions of a cutting maneuver, side shuffle direction change, and forwards to backwards running direction change before and after the competitive season and were recorded using marker-based 3D motion capture. Knee valgus moment time series were calculated for each repetition with inverse kinematics and classified as either “Very Early Peak”, “Early Peak” or “other” using cluster analysis. The classification was based timing of the peak relative to the timing of ACL injuries. The effect of the intervention on the frequency of Very Early Peaks and Early Peaks was evaluated with a mixed Poisson regression controlling for the movement task and pre-season frequency. Results The 11+ intervention reduced the frequency of Early Peak knee valgus moment in one intervention team (coefficient =-1.16, p = 0.004), but not the other (coefficient =-0.01, p = 0.977). No effect was observed on the frequency of Very Early Peak knee valgus moment. Conclusions Reduced frequency of knee valgus moment Early Peak during athletic tasks may explain the mechanism by which The 11+ program decreases risk of ACL injury. Prospective studies with a much larger sample size are required to establish a link between Early Peak knee valgus moments and risk of ACL injury. Level of evidence 2b.Peer reviewe

Hvers vegna er svona erfitt að greina náraverki íþróttamanna?

Efst á síðunni er hægt að nálgast greinina í heild sinni með því að smella á hlekkin

Áhrif þreytu á vöðvavirkni og liðferla í hnébeygju hjá þremur mismunandi hópum karla

Tilgangur: Markmið rannsóknarinnar var að kanna áhrif þreytu á rafvirkni vöðva og hreyfiferla í hnébeygju milli þriggja hópa einstaklinga sem voru misjafnlega vel þjálfaðir í æfingunni. Aðferðir: Þátttakendur framkvæmdu hnébeygjur með 80% af hámarksþyngd að uppgjöf. Vöðvarafrit var skráð frá 10 vöðvum í neðri útlim og bol sem notaðir eru í hnébeygjunni. Einnig voru breytingar á liðferlum skoðaðar með tveimur myndavélum. Niðurstöður: Frávikum frá eðlilegum liðferlum fjölgaði við þreytu fyrir alla hópana. Vegalengdin sem stöngin ferðaðist jókst marktækt milli fyrstu og síðustu endurtekningar í 80% setti og auk þess hægðist á lyftingarmönnum við þreytu. Mestu breytingar á vöðvarafriti við þreytu urðu á hámarksorku en flestir mældir vöðvar sýndu marktæka aukningu þar á uppleið. Ályktun: Talsverðar breytingar verða á liðferlum við þreytu og gæti verið varhugavert að æfa að uppgjöf. Niðurstöður benda til að með hnébeygju sé hægt að ná þjálfunaráhrifum á flesta mælda vöðva, sérstaklega stærsta þjóvöðva og miðlægan víðfaðmavöðva