Search for dissertations about: "twitch"

Showing result 1 - 5 of 31 swedish dissertations containing the word twitch.

  2. 1. Post activation potentiation : Modulating factors and mechanisms for muscle performance

    Author : Paulo Gago; Ekblom Maria; Anton Arndt; Nicola Maffiuletti; Gymnastik- och idrottshögskolan; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Potentiation; twitch; triceps surae; knee angle; stiffnes; length changes; electromechanical delay; Medicin Teknik; Medicine Technology;

    Abstract : Introduction: Acute enhancements of muscle contractile properties and performance subsequent to a maximal or near maximal conditioning contraction are often termed post activation potentiation (PAP). Although still controversial, PAP is commonly linked to enhancements in the myosin regulatory light chain phosphorylation, leading to improvements in the excitation–contraction coupling. READ MORE

  4. 2. Identification of single motor units in ultrafast ultrasound image sequences of voluntary skeletal muscle contractions

    Author : Robin Rohlén; Christer Grönlund; Jun Yu; Dario Farina; Umeå universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ultrafast ultrasound; motor units; decomposition; skeletal muscle; voluntary contractions; electromyography; twitch; imaging;

    Abstract : The central nervous system controls human force production by successive recruitment of motor units in the skeletal muscles and changing their neural firing rate. The motor unit comprises a motoneuron, its innervated muscle fibers, and its axons. READ MORE

  5. 3. On spinal mechanisms for reflex control in man : modulation of Ia-afferent excitation with changes in muscle length, activation level and fatigue

    Author : Maria M. Nordlund; Gymnastik- och idrottshögskolan; Karolinska Institutet; Karolinska Institutet; []
    Keywords : Electromyography; eccentric; concentric; presynaptic inhibition; H-reflex; central fatigue; twitch interpolation; muscle spindle; Medicin Teknik; Medicine Technology; Electromyography; eccentric; concentric; presynaptic inhibition; H-reflex; central fatigue; twitch interpolation; muscle spindle;

    Abstract : To control muscle force, neural activation has to take alterations in muscle mechanics into account. This thesis assesses modulations in excitatory efficacy of Ia-afferents during muscle length changes at different levels of voluntary activation and during fatigue. READ MORE

  6. 4. Experimental studies on mouse slow and fast twitch muscles

    Author : Filli Nurhussen; Anders Eriksson; Ulla Svantesson; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Other engineering mechanics; Övrig teknisk mekanik;

    Abstract : This thesis deals with physiological and mechanical properties of fast and slow twitch mouse muscles. It discusses isometric, concentric and eccentric contractions of mouse extensor digitorum longus ('EDL') and soleus ('SOL') muscles. READ MORE

  7. 5. The role of Six1 in muscle progenitor cells and the establishment of fast-twitch muscle fibres

    Author : Hanna Nord; Jonas von Hofsten; Freek van Eeden; Umeå universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Myogenesis; zebrafish; muscle fibre; patterning; fmyhc; myl1; Six1; Pax7;

    Abstract : Myogenesis is the process of skeletal muscle tissue formation where committed muscle progenitor cells differentiate into skeletal muscle fibres. Depending on the instructive cues the muscle progenitor cells receive they will differentiate into specific fibre types with different properties. READ MORE