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19 Cards in this Set
- Front
- Back
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Rest energy requirements |
Almost 100% ATP produced aerobic |
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Oxygen deficit |
Lag in oxygen uptake at the beginning of exercise Trained subjects have lower oxygen deficit- better aerobic capacity |
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Oxygen debt |
Termed by AV Hill Repayment for O2 deficit at onset of exercise |
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Rapid portion of O2 debt |
Resynthesis if stored PC Replenish muscle and blood O2 stores |
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Slow portion of O2 debt |
Elevated HR and breathing increases energy need Elevated body temp increases metabolic rate Elevated epi and norepi Conversion of lactic acid to glucose (gluconeogenesis) |
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Removal of lactic acid |
70% oxidized by cells 20% converted to glucose 10% converted to AA originally believed that majority of LA converted to glucose in liver |
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Most rapid way to remove lactic acid |
Light exercise performed during recovery 30-40% VO2 max |
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ATP production first 1-5 seconds |
ATP-PC system |
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ATP production longer than 5 seconds |
Shifts to glycolysis |
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ATP production longer than 45 seconds |
ATP-PC, glycolysis, and aerobic pathways 70/30% aerobic at 60s 50/50% aerobic at 2 mins |
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Prolonged exercise (<10 mins) |
Primarily aerobic metabolism |
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Prolonged exercise in heat/humidity |
Increases in body temp and blood levels of epi and norepi increase oxygen uptake |
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Relationship between oxygen uptake and work rate (VO2) |
Increases linearly until max vo2 is reached |
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Lactate threshold |
The point at which lactic acid rises systematically during incremental exercise 50-60% vo2 max in untrained higher in trained |
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Onset of blood lactate accumulation (OBLA) |
Exercise intensity at which blood lactate levels reach 4 mmol/L |
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Explanations for lactate threshold |
Hypoxia- low muscle oxygen Accelerated glycolysis Recruitment of fast twitch muscle fibers Reduced rate of LA removal from blood |
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Uses of lactate threshold |
Prediction of performance in combo with exercise economy Marker for training intensity Choose training HR based on threshold |
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Does lactate cause muscle soreness? |
No. Caused by damage to muscles |
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Exercise intensity and fuel selection |
Low intensity fats primary fuel High intensity carbs primary fuel |
