exercise threshold

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41 Terms

1

Utilization of a given energy system is dependent on

  • rate of energy demand

    • magnitude, timeline

  • Substrate availability

  • local (mitoch) oxygen supply

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2

Rate of energy demand and utilization energy

  • it takes time for aerobic system to supply energy

  • aerobic energy is pretty slow (low rate)

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3

Substrate avialability and utilization energy system

  • ATP + PCr run out

  • without substrate we can’t do metabolism

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4

Local oxygen supply (in mitoch)

  • limits on O2 supply will limit aerobic performance

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5

Oxygen at any given time can be

  • in the lungs

  • bound to hemoglobin within the blood

  • bound to myoglobin in the muscle

  • in the mitochondria

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6

In order for oxygen to be consumed it has to be

  • present in the mitochondria of the working muscle

  • if oxygen is not present or present in sufficient amounts then the muscle must utilize anerobic sources

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7

Oxygen does no good when

  • oxygen in the lungs or blood does the exerciser no good

  • oxygen bound to myoglobin in non-active muscles does the exerciser no good

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8

Local muscle can have insufficent oxygen supply for aerobic metabolizm

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9

Insufficient oxygen supply for aerobic metabolism results

in anaerobic compensation which will lead to fatigue

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10

Oxygen defecit can be

brief

sustained

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11

brief oxygen defecit

  • quickly resolved deficiencies in oxygen supply

  • At Onset of exercise or increase in intensity

  • small, brief, loca

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12

Sustained oxygen deficit

  • deficiency in oxygen supply so anaerobic has to supplement energy supply

    • larger, sustained and accumlating, becoming systemic

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13

look into oxygen deficit

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14

two metabolic boundaries

  • threshold one

  • threshold twothreshol

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15

threshold one

the intensity at which blood lactate can be maintained at resting levels

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16

threshold 2

the intensity at which lactate production within muscle may be stabilized in blood

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17

production and clearance of lactate look

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18

H+ clearance

  • cleared by using bicarbonate buffering

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19

bicarbonate buffering

HCO3 combines with H+ to form water and carbon dioxide

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20

Lactate clearance

lactate is converted back into pyruvate

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21

clearance of lactate and H+ can occur in both

  • the muscle of origin

  • the blood

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22

Lactate and H+ are produced in _______ but cleared _____

produced in the muscle

cleared in the muscle and in the blood

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23

order of metabolic boundaries order

moderate, threshold one, heacy, threshold 2, severe

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24

Moderate section

  • mostly aerobic, whatever lactate that is produced gets buffered locally

  • no change in blood lactate

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25

Heavy area

lactate production in the muscle exceeds lactate clearence in the muscle but is buffered in the blood

  • lactate spilling over into blood

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26

Severe exercise

lactate production in the muscle exceeds systemic lactate clearance

  • blood lactate accumulation accelerates

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27

lactate in moderate

lactate is produced and cleared locally

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28

lactate and heavy

too much lactate is produced so it has to be cleared systemically

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29

severe lactate exercise

too much lactate is produced overall, systemic clearance can’t keep up

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30

Higher intensity domain training is

shorter in duration and requires greater recovery

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31

Lower intensity training is

longer in duration but requires shorter recovery

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32

Energy system activation is dependent on

rate of demand, substrate availability, oxygen supply

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33

at higher intensities oxygen

supplies fails to meet energy demand

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34

intensity can be quantified based on relationship between

lactate production and clearance (thresholds)

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35

At the onset of exercise,

anaerobic systems compensate for delays in aerobic metabolism (ocygen defecit)

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