Search results for "AHA"
showing 10 items of 1702 documents
Effects of internal kinetics and muscle activity during the wide and narrow barbell back squat
2017
Lahti, J. 2017. Effects of internal kinetics and muscle activity during the wide and narrow barbell back squat. Sports biology department, University of Jyväskylä. Master’s thesis. p. 102 (4 attachments). Introduction. The barbell back squat (BBS) is a commonly utilized strength exercise to support general preparedness for the demands in multiple sports. Recently, studies have shown various strength training exercises have the potential to recruit the regions of the hamstrings differently. Specifically, it is unknown if changing stance width under conditions where forward knee movement is restricted engages the hamstring regions differently and how this corresponds with measured 3-D net joi…
Effects of barbell back squat stance width on sagittal and frontal hip & knee kinetics
2019
Different stance widths are commonly utilized when completing the barbell back squat during athletic general preparedness training. Width manipulation is thought to influence sagittal plane stimuli to the hip and knee extensors, the primary extensor musculature in the squat. However, how width manipulation affects frontal plane stimuli is less understood. Knowledge of hip and knee net joint moments (NJM) could improve exercise selection when aiming to improve sport‐specific performance and prevent injuries. Fourteen adult amateur rugby athletes were recruited for this study. After a familiarization period, participants performed wide‐ (WIDE, 1.5× greater trochanter width) and narrow‐stance …
Effect of Training-Induced Changes in Achilles Tendon Stiffness on Muscle–Tendon Behavior During Landing
2018
During rapid deceleration of the body, tendons buffer part of the elongation of the muscle–tendon unit (MTU), enabling safe energy dissipation via eccentric muscle contraction. Yet, the influence of changes in tendon stiffness within the physiological range upon these lengthening contractions is unknown. This study aimed to examine the effect of training-induced stiffening of the Achilles tendon on triceps surae muscle–tendon behavior during a landing task. Twenty-one male subjects were assigned to either a 10-week resistance-training program consisting of single-leg isometric plantarflexion (n = 11) or to a non-training control group (n = 10). Before and after the training period, plantarf…
Musiikinopettaja ja erityisopettaja : kelpoisuuksista kentälle
2016
Musiikinopettajan työ on hyvin vaativaa ja monipuolista. Oppilasryhmien heterogeenisuus tulee kasvamaan lisääntyvän inkluusion ideologian yleistyessä ja kouluihin halutaan yhä enemmän laaja-alaisia osaajia vastaamaan koulujen erilaisiin tarpeisiin. Tutkimukseni tarkoituksena on selvittää, mitä hyötyä musiikinopettajalle on erityisopettajan kelpoisuudesta musiikin opetustyön, opettajuuden kehittymisen ja ammatillisen tulevaisuuden kannalta. On sanomattakin selvää, että kaksoiskelpoisuus antaa opettajalle kaksinkertaisen mahdollisuuden onnistua opetusalalle työllistymisessä, mutta tutkimukseni pyrkiikin vastaamaan kysymykseen enemmän musiikinopettajan näkökulmasta. Tutkimukseni on laadullinen…
Pietarista Jyväskylään musiikkitunneille : tapaustutkimus maahanmuuttajanuoren suhteesta musiikkiin ja musiikin opetukseen Suomessa
2000
Selective hemicellulose hydrolysis of Scots pine sawdust
2019
The depletion of fossil resources is driving forward the search for new and alternative renewable feedstocks in the production of renewable chemicals, which could replace the petroleum-based ones. One such feedstock is pine (Pinus sylvestris) sawdust, which is generated enormous amounts in Finnish sawmills yearly. However, prior to the utilization in high-value applications, it needs to be fractionated into its constituents. In this work, the objective was to produce monomeric hemicellulose sugars from pine sawdust without degrading cellulose or lignin simultaneously. The influence of the reaction temperature and time, as well as acid type and concentration, was studied. Based on the result…
Eräiden pienimolekyylisten alifaattisten karboksyylihappojen valmistus
2012
Mentaalinen kuvittelu ja metaforat orkesterimuusikon työssä
2016
Orkesterimuusikon työ koostuu useasta eri osa-alueesta: se sisältää harjoittelua yksin ja yhdessä muiden soittajien kanssa kulminoituen esitystilanteeseen, jossa kommunikoidaan yleisölle. Harjoittelun tarkoituksena on saavuttaa teknisesti ja tulkinnallisesti mahdollisimman hyvä soittosuoritus, mutta muusikolta vaaditaan myös ymmärrystä siitä, mitä musiikissa sisällöllisesti tapahtuu ja mistä se kertoo. Yksi muusikon työkalu soittosuorituksen hiomisessa on mentaalinen kuvittelu, joka on mentaalisten mielikuvien käyttöä apuna soittosuorituksen parantamisessa. Musiikin sisällön löytämisessä ja ymmärtämisessä taas voidaan hyödyntää metaforia, jotka tulevat esiin musiikin ja musiikillisen kokemu…
Successful approaches to mental practice : A case study of four pianists
2019
Musicians often use mental practice for enhancing performance, but individuals may have different preferences and skills in their characteristic, individually successful ways of carrying out such practice. In this study, we focus on the approaches to mental practice of four pianists who, according to the ratings of a panel of expert judges, showed outstanding improvement in their performances following their mental practice of a new piece in at least one of the two conditions: silent reading of the score or reading the score while simultaneously listening to the music. The four pianists’ approaches to mental practice were studied through self-reports in post-task interviews that were compar…