Karteikarten
Theories and Concepts
Karten in diesem Stapel (21)
- 1What is DOMS and what muscle contraction is predominantly affected by it?Delayed-onset Musucle Soreness
-ECCENTRIC contraction - 2Explain the SLIDING-FILAMENT THHEORY (Relaxed state)-No actin-myosin interaction at binding site
-Myosin filaments overlap - 3Sliding-filament theory (Contracted state)-Myosin pulls actin to sarcomere center
-Filaments slide passed each other
-SARCOMERES-myofibrils-muscle fibers all shorten - 4Sliding-filament theory cont.-Myosin detaches from active site
-Myosin head rotates back
-Myosin attaches to another one
*process continues until Z-disk reach myosin filaments* - 5What is the cause of FATIGUE in 10,000m run; 400m run?10,000m depletion of intramuscular glycogen
400m increase in H + - 6What is the LACTATE THRESHOLD?Workload increases = expensive increase in lactate
- 7Size-principle & motor neuron relationshipNeurons are recruited by size
Type I (smaller) recruited first
Type IIa, IIx (larger) recruited second - 8How is lactate produced in high-intensity exercise?Glyconeogensis
Oxidative fuel - 9Isometric contractions occur at ______ velocity of movementZERO
- 10Tricep and pectoralis major in the DOWN phase of a push-up is what type of contraction?Eccentric
- 11ENDURANCE (type I) muscles have more mitochondria than POWER (type II)True
- 12Examples of Energy systems in a given sport-running 150m : aerobic
-10x 100m sprints, 20 sec rest : lactic
-6 sets, 12 reps BP, 2 min rest : ATP
-Javelin : ATP
5 sets of tennis in 4 hours : lactic - 13What is Motor Unit Recruitment Frequency of Stimulation?"Rate Coding"
- twitch: smallest contractile response
- summation: stimulus in rapid response
-tetanus: continued stimulation - 14Motor Unit RecruitmentSmaller fibers = Less force
Larger fibers = More force - 15TYPE I Dark Meat Slow-oxidative Slow twitch-small
-more mitochondria
-more capillary density
-more oxidative enzymes
-less developed SR complex
-less growth/ less than 300 fibers
-more oxygen necessary for ATP
-50% in average muscle
-peak tension 110ms %
-endurance athletes
(Soleus muscle) - 16TYPE IIa, IIx White Meat Fast-oxidative glycolytic/ Fast glycolytic Fast twitch-Larger
-Less mitachondria
-less capillary density
-less oxidative enzymes
-more developed SR complex
-more growth/ more than 300 fibers
-25% in average muscle
-power athletes
-peak tension 50ms
-fatigue quickly - 17Generation of Action Potential-Motor neurons dendrites (specialized receptors)
-Action potential travels down axon to axon
-Nerve endings release neurotransmitter (ACH) crosses synaptic deft * binges receptors to plasmalemma
-RMR -70mV to +30mV - 18Length-Tension RelationshipOptimal sarcomere length + optimal overlap
-too short/ stretched = no / little force - 19Speed-force RelationshipConcentric: maximal force development DECREASE @ higher speeds
Eccentric: maximal force INCREASE @ higher speeds - 20Lactate ThresholdWorkload increase = expertise increase in lactate
- 21Skeletal Muscle Contraction from Organ MoleculePec Major - convergent
Orbicularis oris - circular
Deltoid - multiplennate
Sartorius - parallel
Biceps brachii - fused form
Extensor digits rum longus - unipennate
Rectus femoris- bipennate
Informationen
- Beschreibung
- Midterm Exercise physiology Karteikarten am Theories and Concepts , erstellt von Tamara Jacob am 24/02/2016.
- Erstellt von
- Tamara Jacob
- Aufrufe
- 22
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