Date post: | 18-Dec-2015 |
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DO NOW
• WHAT HAPPENS WHEN YOU WORK OUT WITHIN YOUR MUSCLES? (THINK BACK TO BIO AND THE TOPIC OF CELLULAR RESPIRATION!)
OBJECTIVES
• TO EXPLAIN WHAT HAPPENS DURING MUSCULAR FATIGUE
• TO IDENTIFY DIFFERENT MUSCULAR RESPONSES
• TO LABEL AND EXPLAIN THE DIFFERENT STAGES OF CONTRACTION
MUSCLE FATIGUE• CELLS UNDERGO BOTH AEROBIC AND ANAEROBIC RESPIRATION TOO SUPPLY
AMPLE ATP (LACTIC ACID FERMENTATION)
• LACTIC ACID CREATES AN OXYGEN DEBT BECAUSE THE LIVER CELLS MUST NOW USE OXYGEN TO BREAK DOWN THE LACTIC ACID (CAN TAKE SEVERAL HOURS)
• LACTIC ACID LOWERS THE PH, WHICH DIMINISHES THE MUSCLE FIBERS RESPONSE TO STIMULATION
• MORE EXERCISE = MORE GLYCOLYTIC ENZYMES = INCREASED CAPACITY FOR GLYCOLYSIS= INCREASED CAPACITY FOR AEROBIC RESPIRATION!! … START WORKING OUT
MUSCLE CONTRACTION• A MUSCLE FIBER WILL CONTRACT
AFTER THRESHOLD STIMULUS HAS BEEN REACHED.
• ONCE STIMULATED, THE ENTIRE FIBER COMPLETELY CONTRACTS WHICH IS CALLED THE ALL-OR-NONE RESPONSE.
• *THE EXTENT OF SHORTENING DEPENDS ON RESISTANCE.
MYOGRAM• TWITCH= SINGLE MUSCLE
CONTRACTION
• LATENT PERIOD: TIME BETWEEN STIMULATION AND RESPONSE
• PERIOD OF CONTRACTION: MUSCLE IS CONTRACTED
• RELAXATION: FIBER RETURNS TO FORMER LENGTH
HYPERTROPHY VS. ATROPHY• HYPERTROPHY- MUSCLES RESPOND TO
EXERCISE AND ENLARGE
• SLOW TWITCH FIBERS ACTIVATED BY LOW INTENSITY EXERCISE SUCH AS SWIMMING OR RUNNING, DEVELOP MORE MITOCHONDRIA AND CAPILLARIES, PROLONGING FATIGUE
• FAST TWITCH FIBERS ACTIVATED BY WEIGHT LIFTING CAN PRODUCE NEW MYOFILAMENTS & ENLARGE THE MUSCLE (THEY ARE STILL FATIGABLE)
• ATROPHY- WHEN REGULAR EXERCISE STOPS, CAPILLARY NETWORKS SHRINK, MITOCHONDRIA DECREASE, ACTIN & MYOSIN DECREASE, AND MUSCLE SHRINKS.
TYPES OF GRAPHS• TWITCH- FULL CONTRACTION
• SUMMATION- FORCE OF EACH TWITCH COMBINES INCOMPLETE TETANUS- MINIMAL AMT. OF RELAXATION AFTER EACH STIMULUS
• COMPLETE TETANUS- NO RELAXATION, CONTINUOUS CALCIUM ION DEPOSIT
TETANUS• CAUSED BY CLOSTRIDIUM BACTERIA
PRESENT IN SOIL
• BACTERIA PRODUCES A NEUROTOXIN WHICH BLOCKS THE RELEASE OF INHIBITORY NEUROTRANSMITTERS.