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[{"key": "dc.contributor.author", "value": "Stenroth, Lauri", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2013-02-19T09:13:34Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2013-02-19T09:13:34Z", "language": "", "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2012", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1253802", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/40960", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Achilles tendon is the largest tendon in human body and it has an important role in human\r\nlocomotion. Ageing is associated with lowered muscle function and the changes in\r\ntendon properties could have a major role in modulating the muscle function with ageing.\r\nThe aim of this study was to identify the changes in triceps surae muscle-tendon\r\ncomplex with ageing.\r\nAchilles tendon mechanical properties and triceps surae muscle architecture were measured\r\nfrom total of 100 subjects [33 young (24 \u00b1 2 yr.) and 67 old (75 \u00b1 3 yr.)]. Motion\r\nanalysis assisted ultrasonography was used to determine Achilles tendon stiffness,\r\nYoung\u2019s modulus and hysteresis during isometric ramp contractions. Ultrasonography\r\nwas used to measure muscle architectural features from triceps surae muscles.\r\nThe main findings of the study were that Achilles tendon stiffness was decreased by 17 %\r\n(p < 0.001) and Young\u2019s modulus by 32 % (p < 0.001) with ageing. There was no difference\r\nin hysteresis between young and old. Achilles tendon stiffness and Young\u2019s\r\nmodulus were found to be associated with the triceps surae muscles force producing\r\ncapacity (r = 0.612, p < 0.001 and r = 0.625, p < 0.001 for stiffness and Young\u2019s modulus,\r\nrespectively) in combined data of young and old subjects. Achilles tendon crosssectional\r\narea was 20 % higher (p < 0.001, n = 71) in old than young subjects measured\r\nfrom the middle of the free Achilles tendon but the muscle cross-sectional area measured\r\nfrom the both heads of gastrocnemius muscle was lowered by 15 % (p < 0.001) in\r\nold compared to young subjects. The triceps surae muscle force was 39 % (p < 0.001)\r\nlower in old compared to young. Gastrocnemius medialis and soleus muscle thickness\r\nand gastrocnemius medialis muscle fascicle length was lower in old compared to young\r\n(for all p < 0.05). There were no other differences in muscle architecture in old compared\r\nto young subjects.\r\nThe data suggests that Achilles tendon mechanical properties are modulated to match\r\nthe level of muscle performance even at old age. The functional consequence of these\r\nfindings is that the Achilles tendon of old individuals seem to be more suitable for normal\r\ndaily activities of old people like walking than the Achilles tendon of young individuals.\r\nThe changes in the Achilles tendon mechanical properties can counteract the\r\nlowered muscle performance in order to keep the functional capacity of the muscletendon\r\ncomplex as good as possible.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Akillesj\u00e4nne on ihmiskehon suurin j\u00e4nne ja sill\u00e4 merkitt\u00e4v\u00e4 rooli ihmisen liikkumisessa. \r\nIk\u00e4\u00e4ntymiseen liittyy heikentynyt lihasten toimintakyky ja muutoksilla j\u00e4nteen ominaisuuksissa voi olla merkitt\u00e4v\u00e4 rooli lihaksen toimintakyvyn muutoksissa ik\u00e4\u00e4ntyess\u00e4. \r\nT\u00e4m\u00e4n tutkimuksen tarkoitus oli tunnistaa muutokset kolmip\u00e4isen kantalihaksen lihasj\u00e4nnekompleksissa. \r\nAkillesj\u00e4nteen ominaisuudet ja kolmip\u00e4isen kantalihaksen lihasarkkitehtuuri mitattiin \r\n100 koehenkil\u00f6lt\u00e4 [33 nuorta (ik\u00e4 24 \u00b1 2 vuotta) ja 67 ik\u00e4\u00e4ntynytt\u00e4 (ik\u00e4 75 \u00b1 3 vuotta)].\r\nAkillesj\u00e4nteen mekaaniset (j\u00e4ykkyys) ja materiaaliset ominaisuudet (Youngin moduli), \r\nsek\u00e4 hystereesi mitattiin k\u00e4ytt\u00e4en liikeanalyysiavusteista ultra\u00e4\u00e4nikuvantamista isometristen plantaarifleksioiden aikana. Ultra\u00e4\u00e4nikuvantamista k\u00e4ytettiin m\u00e4\u00e4ritt\u00e4m\u00e4\u00e4n lihaksen arkkitehtuurisia tekij\u00f6it\u00e4 kolmip\u00e4isest\u00e4 kantalihaksesta. \r\nTutkimuksen p\u00e4\u00e4tulokset olivat, ett\u00e4 akillesj\u00e4nteen j\u00e4ykkyys oli v\u00e4hentynyt 17 % (p < \r\n0,001) ja Youngin moduli 32 % (p < 0,001) ik\u00e4\u00e4ntymisen seurauksena. Hystereesiss\u00e4 ei \r\nhavaittu eroja nuorten ja ik\u00e4\u00e4ntyneiden v\u00e4lill\u00e4. Akillesj\u00e4nteen poikkipinta-ala oli 20 % \r\nsuurempi (p < 0,001, n = 71) ik\u00e4\u00e4ntyneill\u00e4 verrattuna nuoriin puhtaan j\u00e4nteen puoliv\u00e4-\r\nliss\u00e4. Akillesj\u00e4nteen j\u00e4ykkyys ja Youngin moduli olivat yhteydess\u00e4 kolmip\u00e4isen kantalihaksen voimantuottokykyyn (j\u00e4ykkyydelle: r = 0.612, p < 0.001 ja Youngin modulille:\r\nr = 0.625, p < 0.001) yhdistetyss\u00e4 aineistossa. Kaksoiskantalihasten poikkipinta-ala oli \r\n15 % (p < 0,001) pienempi ik\u00e4\u00e4ntyneill\u00e4 verrattuna nuoriin. Kolmip\u00e4isen kantalihaksen \r\nlihasvoima oli 39 % (p < 0,001) alhaisempi ik\u00e4\u00e4ntyneill\u00e4 verrattuna nuoriin. Kasip\u00e4isen \r\nkantalihaksen sisemm\u00e4n osan lihaksen paksuus ja lihassolukimppujen pituus, sek\u00e4 leve-\r\n\u00e4n kantalihaksen paksuus oli pienempi ik\u00e4\u00e4ntyneill\u00e4 verrattuna nuoriin (p < 0,05 kaikille). Muita eroja lihasarkkitehtuurissa nuorten ja ik\u00e4\u00e4ntyneiden v\u00e4lill\u00e4 ei l\u00f6ydetty. \r\nTulokset osoittavat, ett\u00e4 akillesj\u00e4nteen mekaaniset ominaisuudet mukautuvat lihaksen \r\nvoimantuottokyvyn mukaan niin ik\u00e4\u00e4ntyneill\u00e4, kuin nuorillakin. N\u00e4iden l\u00f6yd\u00f6sten toiminnallinen seuraus on se, ett\u00e4 ik\u00e4\u00e4ntyneiden ihmisten akillesj\u00e4nne n\u00e4ytt\u00e4\u00e4 olevan paremmin soveltuva heid\u00e4n p\u00e4ivitt\u00e4isiin liikkumismuotoihin, kuten k\u00e4velyyn verrattuna \r\nnuorten ihmisten akillesj\u00e4nteeseen. Akillesj\u00e4nteen mekaanisten ominaisuuksien muutokset ik\u00e4\u00e4ntyess\u00e4 voivat v\u00e4hent\u00e4\u00e4 lihaksessa tapahtuvia toimintakyky\u00e4 heikent\u00e4vi\u00e4 \r\nmuutoksia pit\u00e4en lihas-j\u00e4nnekompleksin toimintakyvyn niin hyv\u00e4n\u00e4, kuin mahdollista.", "language": "fin", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Miia Hakanen (mihakane) on 2013-02-19 09:13:33.600249. Form: Admin-lomake Pro gradu -t\u00f6ille (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/admin-lomake-pro-gradu-toille). JyX data:", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija@noreply.fi) on 2013-02-19T09:13:34Z\r\nNo. of bitstreams: 2\r\nURN:NBN:fi:jyu-201302191242.pdf: 3283912 bytes, checksum: 998586e094bc2e9e415f92d9fd8ba997 (MD5)\r\nlicense.html: 107 bytes, checksum: a7d86e598caa500b1b433bbb9dc8ef1c (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2013-02-19T09:13:34Z (GMT). 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"stiffness", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Young\u2019s modulus", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "hysteresis", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "muscle architecture", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "ageing", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Effects of ageing on Achilles tendon properties and triceps surae muscle architecture in vivo", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": 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null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kantaj\u00e4nne", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.rights.accessrights", "value": "Aineistoon p\u00e4\u00e4sy\u00e4 on rajoitettu tekij\u00e4noikeussyist\u00e4. Aineisto on luettavissa Jyv\u00e4skyl\u00e4n yliopiston kirjaston arkistoty\u00f6asemalta. Ks. https://kirjasto.jyu.fi/fi/tyoskentelytilat/laitteet-ja-tilat.", "language": "fi", "element": "rights", "qualifier": "accessrights", "schema": "dc"}, {"key": "dc.rights.accessrights", "value": "This material has a restricted access due to copyright reasons. It can be read at the workstation at Jyv\u00e4skyl\u00e4 University Library reserved for the use of archival materials: https://kirjasto.jyu.fi/en/workspaces/facilities.", "language": "en", "element": "rights", "qualifier": "accessrights", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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