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لاکتات خون و ورزش. استادارجمند: جناب آقای دکتر عطارزاده تهیه: سیدعلی اسماعیلی بهار85. LT?. آستانه لاکتات. نقطه ای که لاکتات خون درجریان ورزشهای باشدت فزاینده، شروع به تجمع فراتر ازسطوح استراحتی خود می کند. باافزایش شدت فعالیت، لاکتات به سرعت تجمع پیدا می کند. (2). LT. آستانه لاکتات.

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لاکتات خون و ورزش

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85


LT?

. .(2)


LT


  • .(2)

  • .(2)

  • .(2)


  • .(2)

  • 2 4 .(2)

  • .(2)


  • .(2)

  • 80VO2max 60 VO2max.(2)

  • .(2)


  • VO2max

    VO2max

  • .(2)

  • .(2)


  • 5060 VO2max .(2)

  • 7080 VO2max .(2)


Training status and LT


Should exercise intensity be expressed relative to LT or VO2max?

VO2max

LT

Better way to equate a relative intensity based on metabolic state

max SS capacity

max SS capacity

+

non-SS capacity


  • .(2)

  • .(2)

  • .(2)

  • .(2)

  • .

  • .(2)


Lactate Threshold


  • .(1)

  • .(1)


  • (EPI (NE . (1) (1989)

  • ( ) ( ) . 97 /0


Review of mechanisms to explain LT

Blood catecholamines

La- production

Mito. Capacity for pyruvate exceeded

Redox potential


  • .(4)

  • .(4)

  • PH .(4)

  • .(4)


  • . . .(3)

  • .(2)

  • . PH5/1 . PH 1/7 6/64/6 .(2)

  • PH .PH 9/6 . PH 4/6 ATP .(2)


  • 0( .(3)

  • .(3)


  • :

    • (H+ concentration)

    • (HCO3-)

H+ + HCO3-H2CO3

H2O +CO2

Lung

Muscle

RBC

    • hyperventilation!!



  • : 1 .(1)

  • : 5/2 10 .(1)


  • 52/24 . .(1)

  • .(1)


  • .(1)

  • :

  • 4 .( 180 204 216VO2 76/30 89/34 71/37 ) .(1)( - 1991)


  • (1)


  • . (1)

  • QO2 ( ) ((LT-VO2 94/0 VO2))83/0.(1)

  • .(1)


  • (ST) ((LT-VO2 74/0 ((LT-%VO270/0 .(1)

  • .(1)


  • (1991) .(1)

  • II I I .(1)

  • II I .(1)


  • ( I ) ( IIa IIb ) I IIa .(1)

  • .(1)


  • .(1)


  • .(1)( 1981)

  • (Hla) 275 .(1)


  • (1984) . VO2 .(1)


  • ( ) ( ) ()(1984).(1)


  • .(1)

  • (). (1)

  • .(1)

  • .(1)

  • .(1)


  • .(1)

  • .(1)

  • .(4)

  • VO2 . . .(4)( )


  • 50%

  • 5

  • 4 .


  • VO2max . .(3)


  • . (3)

  • . .(2)


  • . .(3)

  • . (3)


  • 8 . (1)

  • . . .(3)



(SDH)

  • (SDH) (7 ) VO2max . VO2max .(2)


  • UTMTHT

  • .(2)


  • .(1)

  • .(1)


  • .(2)

  • 1930 (9/7 9 5340) .(2)

  • .(2)


  • .(1)

  • .(1)


LT better measure of endurance performance!!!

What have we learned?


  • : :

  • : .- . :

  • : . : - -

  • : . - . :


References

5.WWW.learn.sdstate.edu/Matthew_Vukovich/PE%2051%20labs/lab4Thresholds.ppt-

6.WWW.rohan.sdsu.edu/course/ens304/public_Html/section2/chapter13.ppt

7.WWW2.fhs.usyd.edu.au/Ess//oconnor/Ex%20hys%20Human


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