final exam review - Exam3ReviewSheet MythBusters 1...

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Exam 3 Review Sheet MythBusters 1. Why doesn’t spot reducing work? Fat mobilization and utilization controlled systemically (hormonal, gender, genetics) Doing sit ups and crunches to lose ab fat doesn’t burn many cals and doesn’t use much fat as substrate 2. What are the flaws in the “fat burning” concept of weight control? At earlier workloads, before the crossover-FAT is the main fuel This concept recommends that you should exercise at low intensity for longer period of time TOTAL # of CALS is what matters 3. What happens to muscle after resistance/strength training is ceased? When stop exercising, muscle proteins break down and enter AA pool 4. List the major concerns for the fetus during exercise by the expectant mother. Are these concerns legitimate? Hypoglycemia, hyperthermia, decreased placental blood flow, physical shock Major concerns: 1.blood flow is diverted from fetus to muscle (reducing blood flow to fetus) 2. Use glucose when exercising, fetus’ main fuel is glucose 3. * if fetus gets to warm, could create neurological defects to fetus 5. What are the symptoms of immediate muscle soreness? What mechanisms contribute to muscle soreness immediately after exercise? Symptoms are burning, pain, cramps, motor impairment Immediate soreness is called by: 1.decreased local blood flow ischemia (decrease in pH causing the burn) 2. Decreased O2 increased H+ Muscle soreness after exercise is caused by sustained contractions, blood vessel collapses, reduced blood flow to exercising muscles causing localized ischemia 6. Define DOMS (Delayed Onset Muscle Soreness) and contrast it to immediate muscle soreness. What are the symptoms and time course of DOMS? How does DOMS occur? DOMS occurs 8-48hrs after novel exercise bout. Symptoms are stiffness, weakness, pain during movement. Eccentric muscle contractions major cause of DOMS. Less muscle fibers with just as much force. CrK is #1 marker for eccentric contraction 7. What is the evidence for DOMS-related muscle damage?
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CK, Mb, LDH leak into blood due to damaged muscle cell membranes, Z-line streaming, 3-methylhistidine 8. How does an acute bout of lengthening contractions (that result in DOMS) confer a protective effect for subsequent bouts of the same activity? How long does this protective benefit last? Your muscles are actually damaged, wont be able to work out as intensely with DOMS. You’re sore, protecting affect against max voluntary contraction. Don’t want to rupture muscle or do any additional damage. Replace fibers with stronger ones, lasts up to 9 weeks. Once you’re sore, don’t stay sore, body adapts, make mus stronger—sarcolema turn over rate. Protective effect is an adaptation. So if causes damage, wants to repair it so it doesn’t do that damage again. If do eccentric contractions, there is a certain window where you don’t want to do that contraction again. Wait an optimal period before doing it again (6 weeks).
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