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Continuous or rapidly repeated contraction of muscles results in
muscle fatigue
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Muscle fatigue results from a lack of ______ and a build up of ______ ____
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During vigorous exercise muscles cannot get enough oxygen to enable them to break _______ down completely to __________ and water. Instead they respire anaerobically, breaking glucose down to ______ ____.
- glucose
- carbon dioxide
- lactic acid
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As the levels of ______ ____ build up, the muscles become quickly fatigued.
lactic acid
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During exercise both ______ rate and ______ breathing rate increase
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The breathing rate increases in order to get more ______ into the bloodstream.
oxygen
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The pulse rate increases because the heart must beat _____ in order to deliver the blood to the muscles more quickly.
faster
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________ ____ is the time taken for the body to return to normal levels of pulse rate, breathing rate and lactic acid.
Recovery time
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In athletes, during exercise the pulse rate, breathing rate and lactic acid level rise ____ than in an untrained person.
less
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After exercise the recovery time will be ____ for a fit person than for an unfit person. ________ ____ can be used as an indication of physical fitness.
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Training improves the efficiency of the _____ and ________
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As a person trains, their fitness _________ and their recovery time after exercise _________
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