Search results for "lihasaktiivisuus"
showing 10 items of 28 documents
Region-dependent hamstrings activity in Nordic hamstring exercise and stiff-leg deadlift defined with high-density electromyography
2018
Recent studies suggest region-specific metabolic activity in hamstring muscles during injury prevention exercises, but the neural representation of this phenomenon is unknown. The aim of this study was to examine whether regional differences are evident in the activity of biceps femoris long head (BFlh) and semitendinosus (ST) muscles during two common injury prevention exercises. Twelve male participants without a history of hamstring injury performed the Nordic hamstring exercise (NHE) and stiff-leg deadlift (SDL) while BFlh and ST activities were recorded with high-density electromyography (HD-EMG). Normalized activity was calculated from the distal, middle, and proximal regions in the e…
High-density electromyography activity in various hamstring exercises
2019
Proximal-distal differences in muscle activity are rarely considered when defining the activity level of hamstring muscles. The aim of this study was to determine the inter-muscular and proximal-distal electromyography (EMG) activity patterns of hamstring muscles during common hamstring exercises. Nineteen amateur athletes without a history of hamstring injury performed 9 exercises, while EMG activity was recorded along the biceps femoris long head (BFlh) and semitendinosus (ST) muscles using 15-channel high-density electromyography (HD-EMG) electrodes. EMG activity levels normalized to those of a maximal voluntary isometric contraction (%MVIC) were determined for the eccentric and concentr…
Acute Neuromuscular Adaptations in Response to Low-Intensity Blood-Flow Restricted Exercise and High-Intensity Resistance Exercise: Are There Any Dif…
2018
Fatela, P, Reis, JF, Mendonca, GV, Freitas, T, Valamatos, MJ, Avela, J, and Mil-Homens, P. Acute neuromuscular adaptations in response to low-intensity blood flow restricted exercise and high-intensity resistance exercise: are there any differences? J Strength Cond Res 32(4): 902-910, 2018-Numerous studies have reported similar neuromuscular adaptations between low-intensity (LI) blood-flow restricted exercise (BFRE) and high-intensity (HI) resistance training. Unfortunately, none of these experimental designs individualized blood flow restriction (BFR) levels to each participant. Thus, their findings are difficult to interpret. We aimed at comparing the acute effects of LI BFR (80% of abso…
Acute Metabolic Response, Energy Expenditure, and EMG Activity in Sitting and Standing
2017
Purpose While merely standing up interrupts sedentary behavior, it is important to study acute metabolic responses during single bouts of sitting and standing to understand the physiological processes affecting the health of office workers. Methods Eighteen healthy middle-age women 49.4 ± 7.9 yr old (range: 40–64) with a body mass index of 23.4 ± 2.8 kg·m−2 volunteered for this laboratory-based randomized crossover trial where they performed 2 h desk work in either sitting or standing postures after overnight fasting. Muscle activity (normalized to walking at 5 km·h−1), respiratory gas exchange, and blood samples were assessed after glucose loading (75 g). Results Compared with seated work,…
Wearable electromyography recordings during daily life activities in children with cerebral palsy.
2020
To test whether wearable textile electromyography (EMG) recording systems may detect differences in muscle activity levels during daily activities between children with cerebral palsy (CP) and age-matched typically developing children.Wearable textile EMG recording systems were used to obtain leg muscle activity in 10 children with spastic CP (four females, six males; mean age 9y 6mo, standard deviation [SD] 2y 4mo, range: 6-13y; Gross Motor Function Classification System [GMFCS] level I and II) and 11 typically developing children (four females, seven males; mean age 9y 9mo, SD 1y 11mo, 7-12y) at rest and while performing seven daily activities.Children with CP showed significantly lower a…
Jalan alle kohdistuvat paineet ja kaari- ja kärkihyppyjen lihasaktiivisuusmallit taitoluistelun kolmoishypyissä
1999
Nelipistevyötuennan vaikutus ylävartalon lihasaktiivisuuteen, selkälihasten refleksivasteeseen ja lihasväsymykseen työkoneperäisessä tärinäaltistukse…
2013
Jylänki, Juha Petteri 2013. Nelipistevyötuennan vaikutus ylävartalon lihasaktiivisuuteen, selkälihasten refleksivasteeseen ja lihasväsymykseen työkoneperäisessä tärinäaltistuksessa. Liikuntabiologian laitos, Vuotech, Jyväskylän Yliopisto. Biomekaniikan pro gradu –tutkielma, 94 s. Tämän tutkimuksen tarkoituksena oli selvittää nelipistevyön tuennan merkitys pitkäkestoisessa (7x8 min) työkoneperäisessä tärinäaltistuksessa. Tuennan vaikutusta tutkittiin mittaamalla altistuksen aiheuttamaa lihasaktiivisuutta altistuksen aikana, sekä altistuksen jälkeistä lihasväsymystä. Tutkimuksessa pyrittiin hakemaan myös yhteyttä lihasaktiivisuuden ja koehenkilöiden kokeman subjektiivisen rasituksen välillä. …
Energy expenditure and muscle activity in active and passive commute among elderly
2011
Since the amount of elderly people and people being overweight are increasing, there should be means to prevent people from getting weight and to ensure longer independency and ability in everyday living among elderly people to decrease the costs that are caused by these trends. Purpose of the study was to compare muscle activity and oxygen consumption in an active and passive commute to demonstrate the effectiveness of active way of living. Thigh muscle EMG activity and oxygen consumption (VO2) during different daily activities such as walking and stair negotiation in unloaded and loaded conditions were measured from 16 elderly individuals, but due to incomplete data nine subjects were inc…
Physiological loading during normal daily life and exercise assessed with electromyography
2014
Monikanavaelektrodilla mitattu alueellinen lihasaktiivisuus eri nivelkulmilla isometrisessä tahdonalaisessa ja sähköstimulaatiolla aiheutetussa lihas…
2014
Elektromyografiaa (EMG) on käytetty jo vuosikymmeniä lihasaktiivisuuden tutkimisessa, mutta edelleen siihen liittyy useita epävarmuustekijöitä. Yksi näistä on EMG-signaalin normalisointi eli kuinka elektromyogrammi tulisi normalisoida erilaisissa suorituksissa ja millainen referenssisupistus tulisi valita normalisointiyhtälön viitearvoksi. Normalisointia pidetään edellytyksenä EMG-signaaleja vertailevalle analyyseille, jos signaalit ovat rekisteröity eri lihaksista, eri henkilöiltä tai samasta lihaksesta eri ajankohtina. Normalisointimenetelmän valinnalla on olennainen vaikutus tutkimuksen kohteena olevan suorituksen tulosten tulkintaan ja validiteettiin. Tämän tutkimuksen tarkoituksena oli…