Search results for "ultraäänitutkimus"
showing 10 items of 26 documents
Muscle-Tendon Interaction During Human Dolphin-Kick Swimming
2019
Without high impact forces, it is not clear how humans can utilize tendon elasticity during low-impact activities. The purpose of the present study was to examine the muscle-tendon behavior together with the electromyographic (EMG) activities of the vastus lateralis (VL) muscle during the human dolphin-kicking. In a swimming pool, each subject (n = 11) swam the 25 m dolphin-kicking at two different speeds (NORMAL and FAST). Surface EMGs were recorded from the VL and biceps femoris (BF) muscles. Simultaneous recordings of the knee joint angle by electro-goniometer and of the VL fascicle length by ultrasonography were used to calculate the muscle-tendon unit and tendinous length of VL(L-MTU a…
Functional muscle architecture in aging
2014
Exploration of muscle–tendon biomechanics one year after Achilles tendon rupture and the compensatory role of flexor hallucis longus
2023
Achilles tendon (AT) rupture leads to long-term structural and functional impairments. Currently, the predictors of good recovery after rupture are poorly known. Thus, we aimed to explore the interconnections between structural, mechanical, and neuromuscular parameters and their associations with factors that could explain good recovery in patients with non-surgically treated AT rupture. A total of 35 patients with unilateral rupture (6 females) participated in this study. Muscle-tendon structural, mechanical, and neuromuscular parameters were measured 1-year after rupture. Interconnections between the inter-limb differences (Δ) were explored using partial correlations, followed by multivar…
Iän yhteys alaraajojen lihasten kokoon ja arkkitehtuurisiin ominaisuuksiin nopeus- ja kestävyyslajien urheilijoilla sekä verrokeilla
2018
Iida Peltonen (2018). Iän yhteys alaraajojen lihasten kokoon ja arkkitehtuurisiin ominaisuuksiin nopeus- ja kestävyyslajien urheilijoilla sekä verrokeilla. Liikuntatieteellinen tiedekunta, Jyväskylän yliopisto, gerontologian ja kansanterveyden pro gradu -tutkielma, 34 s. Iän on todettu olevan negatiivisessa yhteydessä lihaksen kokoon ja lihaksen arkkitehtuurisiin ominaisuuksiin. Fyysisen aktiivisuuden ja kilpaurheiluun liittyvän intensiivisen liikunnan harrastamisen on todettu taas olevan positiivisessa yhteydessä lihaksen kokoon ja lihasarkkitehtuuriin. Ikääntyvät urheilijat saattavat näin ollen hyötyä terveyden ja toimintakyvyn näkökulmasta ikääntyessään harrastetusta kilpaurheilusta. Tut…
Effects of water immersion on soleus neuromuscular parameters
2017
Aquatic rehabilitation is a widely used tool for injury prevention or rehabilitation. The underlying neuromuscular mechanisms during immersion are less known due to methodological issues. The following study main purpose to assess neuromuscular functions and muscle architecture changes within immersed condition. The physical properties of water to the human body are well understood, as well as its effect on the cardiorespiratory system. While the Hoffmann reflex, as a tool to assess neuromuscular changes on dry land is widely examined, it has been rarely used during immersion. The effect of water immersion on muscle behavior is also unknown. In this study control values were recorded in sit…
Akillesjänteen hystereesi lämpökameralla mitattuna
2013
Jännekudokset ovat suuressa merkityksessä liikkumisessa sillä ne välittävät lihassupistuksen aiheuttaman voiman luihin sekä lisäksi toimivat liikkumisen tehokkuuden parantajina säilömällä ja vapauttamalla elastista energiaa. Jänteen käyttäytyminen ja mekaaniset ominaisuudet vaikuttavat koko lihas-jänneyksikön toimintaan. Venytyksen aiheuttaman elastisen energian säilömis- ja varastoimiskyky on yksin jänteen tärkeimmistä ominaisuuksista, sillä se parantaa liikkumisen taloudellisuutta. Hukkaenergian eli hystereesin määrä on tämän ominaisuuden tärkeä mittari. Tämän tutkimuksen tarkoituksena oli validoida jänteiden hystereesin määrityksessä käytettyä ultraäänimenetelmää, ja tarkastella vastaisi…
Reliability and methodology of quantitative assessment of harvested and unharvested patellar tendons of ACL injured athletes using ultrasound tissue …
2019
Ultrasound tissue characterization (UTC) imaging has been previously used to describe the characteristics of patellar and Achilles tendons. UTC imaging compares and correlates successive ultrasonographic transverse tendon images to calculate the distribution of four color-coded echo-types that represent different tendon tissue types. However, UTC has not been used to describe the characteristics of patellar tendons after anterior cruciate ligament reconstruction (ACLR). The aim of this cross-sectional study was to assess the intra and inter-rater reliability of the UTC in unharvested and harvested patellar tendons of patients undergoing ACLR. Intra and inter-rater reliability of both UTC da…
Gastrocnemius tendon length and strain are different when assessed using straight or curved tendon model
2011
The present study investigated the effects of tendon curvature on measurements of tendon length using 3D-kinematic analysis. Curved and straight tendon models were employed for assessing medial gastrocnemius tendon length and strain during hopping (N = 8). Tendon curvature was identified using small reflective markers placed on the skin surface along the length of the tendon and a sum of vectors between the markers from the calcaneous up to the marker at the origin of tendon was calculated. The straight tendon was defined as a length of vector from the calcaneous to the marker at the origin of tendon. The curved tendon method yielded 5.0 ± 1.3 mm longer tendon (p < 0.001) than the straight …