Search results for "Mg"
showing 10 items of 492 documents
To approach or to avoid? : emotional picture viewing effects on reflexive responses in humans
2015
Darba vides riski un inovatīvie risinājumi motorzāģa un krūmgrieža operatoriem Pagasta pārvaldēs
2022
„Darba vides riski un inovatīvie risinājumi motorzāģa un krūmgrieža operatoriem pagasta pārvaldēs.” Darba autors: Arnis Gabranovs. Darba zinātniskais vadītājs: Iveta Daugule. Darbs izklāstīts uz 45 lpp., ietver 1 attēlu, 3 tabulas, 2 pielikumus, 21 informatīvos avotus. Pētījums sastāv no 3 daļām. Pirmajā daļā ir apkopota un analizēta literatūra par darba vides riskiem motorzāģa un krūmgrieža operatora darbā. Literatūras analīze liecina par to, ka motorzāģa un krūmgrieža operatori ir pakļauti dažādiem darba vides riskiem – fiziskiem, fizioloģiskiem, kā arī psiholoģiskiem un organizatoriskiem. Otrajā daļā ir aprakstītas pētījumā lietotā darba vides riska novērtējuma metode. Trešajā daļā ir an…
Triceps surae fascicle stretch is poorly correlated with short latency stretch reflex size
2015
Introduction: The short latency stretch reflex (SLR) is well described, but the stimulus that evokes the SLR remains elusive. One hypothesis states that reflex size is proportional to muscle fiber stretch, so this study examined the relationship between these 2 parameters in human triceps surae muscles. Methods: Achilles tendon taps and dorsiflexion stretches with different amplitudes and preactivation torques were applied to 6 participants while electromyography and muscle fascicle length changes were recorded in soleus and medial gastrocnemius (MG). Results: In response to tendon taps, neither fascicle length nor velocity changes were correlated with SLR size in either muscle, but acceler…
Biomechanische Überlegungen über Stoßkräfte und Fußstabilität beim Laufen
1993
The interaction between "man-shoe and surface" is presented as a model to discuss the complexity of human locomotion. Only if the physiological system "man" interacts positively with the physical requirements of shoe and surface quality running will become effective and economical. Especially during the early ground contact phase the hardness of the shoe construction determines the height of the vertical impact load. These adaptations have consequences in the emg amplitudes during the stretch activation phase of the contact. Comparing various jogging shoes with altered construction properties it can be shown that the "hardness" of the shoe material is well adapted by the variation in the em…
Biomechanical factors affecting energy cost during running utilising different slopes
2020
This study aimed to examine the characteristics of electromyography (EMG) and kinematics of the supporting leg affecting energy cost while running at incline, level, and decline slopes. Twelve male Japanese middle- and long-distance runners volunteered for this study. The subjects were asked to run at 13.5 km·h−1 on a treadmill under three slope conditions. Sagittal plane kinematics and the EMG of the lower limb muscles, respiratory gases were recorded. Energy cost differed significantly between slopes, being the lowest in decline slope and the greatest in incline slope. Integrated EMG (iEMG) of leg extensor muscles was greater in the incline slope than in the decline slope, and iEMG of the…
Effects of Upper Body Eccentric versus Concentric Strength Training and Detraining on Maximal Force, Muscle Activation, Hypertrophy and Serum Hormone…
2022
Effects of eccentric (ECC) versus concentric (CON) strength training of the upper body performed twice a week for 10 weeks followed by detraining for five weeks on maximal force, muscle activation, muscle mass and serum hormone concentrations were investigated in young women (n = 11 and n = 12). One-repetition bench press (1RM), maximal isometric force and surface electromyography (EMG) of triceps brachii (TB), anterior deltoid (AD) and pectoralis major (PM), cross-sectional area (CSA) of TB (Long (LoH) and Lateral Head (LaH)) and thickness of PM, as well as serum concentrations of free testosterone, cortisol, follicle-stimulating hormone, estradiol and sex hormone-binding globulin were mea…
Individuella och lagidrottande idrottsgymnasie-elevers skolframgång
2013
Mitt pro -gradu arbetets uppgift var att undersöka bland idrottsgymnasieelever ifall individuella och lagidrottare skiljer sig från varandra vad gäller skolframgång. Jag ville granska om idrottsgymnasieelever som har olika kön och utövar olika grenar skiljer sig från varandra angående sin skolframgång. Jag ville även få reda på hur idrottsgymnasieelevernas kön, gren, hur mycket de läser och föräldrarnas utbildning förklarar deras skolframgång. Undersökningen var av sin natur kvantitativ. Undersökningsmaterialet samlades med hjälp av frågeformulär (se bilaga 4) från sex idrottsgymnasier runtom i Finland. De undersökta var tillsammans 321 stycken, varav 159 var flickor och 162 var pojkar. De …
Radiation Response of Ce-Codoped Germanosilicate and Phosphosilicate Optical Fibers
2016
We report an experimental investigation on the effects of Ce-codoping in determining the radiation response of germanosilicate and phosphosilicate Optical Fibers (OFs) in the UV-Visible domain and up to doses of $1~\hbox{MGy}({\rm SiO}_{2})$ . We show that the addition of Ce strongly impacts the Radiation Induced Attenuation (RIA) of both types of fibers. In the first case the radiation induced losses increase, whereas in the second one decrease. By combining the online RIA measurements with the Electron Paramagnetic Resonance (EPR) ones, we are able to infer the basic microscopic mechanisms taking place under irradiation, which involve the cerium codopant and some of the known Ge-related o…
Influence of Stress on Electronic and Optical Properties of Rocksalt and Wurtzite MgO–ZnO Nanocomposites with Varying Concentrations of Magnesium and…
2022
The financial support of M-ERA.NET project “ZnMgO materials with tunable band gap for solar-blind UV sensors” (ZMOMUVS) is greatly acknowledged. The Institute of Solid State Physics, University of Latvia, as the Center of Excellence, has received funding from the European Union’s Horizon 2020 Framework Program H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement no. 739508, project CAMART2. The calculations were performed at the Latvian SuperCluster (LASC) located at the Institute of Solid State Physics, University of Latvia.
Electronic and Optical Properties of Rocksalt Mg1−xZnxO and Wurtzite Zn1−xMgxO with Varied Concentrations of Magnesium and Zinc
2022
The financial support of M-ERA.NET project “ZnMgO materials with tunable band gap for solar-blind UV sensors” (ZMOMUVS) is acknowledged. Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Program H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under Grant Agreement No. 739508, project CAMART2. The calculations were performed at the Latvian SuperCluster (LASC) located in Institute of Solid State Physics, University of Latvia.