Ais chapter 6 blood lactate thresholds
This presentation is the property of its rightful owner.
Sponsored Links
1 / 18

AIS Chapter 6 Blood lactate thresholds PowerPoint PPT Presentation


  • 45 Views
  • Uploaded on
  • Presentation posted in: General

AIS Chapter 6 Blood lactate thresholds. Production of Lactic Acid (lactate). Normally, O 2 is available in the mitochondria to accept H + (and electrons) from NADH produced in glycolysis In anaerobic pathways, O 2 is not available

Download Presentation

AIS Chapter 6 Blood lactate thresholds

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Ais chapter 6 blood lactate thresholds

AIS Chapter 6Blood lactate thresholds


Production of lactic acid lactate

Production of Lactic Acid (lactate)

  • Normally, O2 is available in the mitochondria to accept H+ (and electrons) from NADH produced in glycolysis

    • In anaerobic pathways, O2 is not available

  • H+ and electrons from NADH are accepted by pyruvic acid (pyruvate) to form lactic acid


Conversion of pyruvic acid to lactic acid

Conversion of Pyruvic Acid to Lactic Acid

  • Recycling of NAD (NADH  NAD)

  • So that glycolysis can continue

  • LDH: lactate dehydrogenase 乳酸去氫脢


Blood lactate testing rationale

Blood lactate testing rationale

  • Indicators of training adaptation

    • Adapts to a greater degree than VO2max

    • Especially true in highly trained athletes

  • Correlate with endurance performance

    • Better indicator than VO2max

  • Optimal training stimuli


Lactate response after training adaptation

Lactate response after training adaptation


Lactate response after training adaptation1

Lactate response after training adaptation


Definitions of lactate threshold

Definitions of lactate threshold

  • Various terminology

    • Anaerobic threshold, aerobic-anaerobic threshold, onset of blood lactate accumulation (OBLA)

  • Lactate threshold 1 (LT1)

    • First exercise intensity at which there is a sustained increase in lactate above resting level

    • Usually < 2.0 mM

  • Lactate threshold 1 (LT2)

    • First exercise intensity at which there is a very rapid increase in lactate

    • Shift from oxidative to partly anaerobic energy

    • 2.5-5.5 mM


Lt1 and lt2

LT1 and LT2


Fixed lactate concentration 2 0 2 2 2 5 3 0 4 0 mm

Fixed lactate concentration2.0, 2.2, 2.5, 3.0, 4.0 mM


Individualized lactate threshold

Individualized lactate threshold

Lactate E for ADAPT: http://www.nuigalway.ie/maths/jn/LACTATE/html/lactate-e.html


Test protocols

Test protocols

  • Incremental duration: 5-8 min

    • < 5 min may overestimate LT2

    • Especially the purpose is to prescribe exercise intensity for endurance training

  • Rest interval duration: 0-60 s

    • For blood collection and/or modify equipment

  • Number of increments: 5-7

    • Relatively small increments in intensity: 1-2 km/hrper stage (~1 km/hrperferred)


Lactate concentrations in difference durations of stages

Lactate concentrations in difference durations of stages


Lt2 occurs at different lactate concentrations for difference exercise modes

LT2 occurs at different lactate concentrations for difference exercise modes


Lactate concentration in muscle and blood

Lactate concentration in muscle and blood

  • Strong correlation between muscle and blood lactate concentration

  • Blood lactate NOT wholly reflective of muscle lactate

  • High muscle lactate requires significant time lag before lactate equilibrates with blood

    • Require longer (> 5 min) stage duration


Practical applications

Practical applications

  • Use individually measured LT1 and LT2

  • Prescribe endurance training intensities

    • T1: light aerobic

    • T2: moderate aerobic

    • T3: heavy aerobic

    • T4: anaerobic threshold

    • T5: maximal aerobic

  • Evaluate training adaptations

    • Graphical overlays for subjective assessment

    • ↑intensity at LT1: ↑ base aerobic condition

    • ↑intensity at LT2: ↑high-level aerobic endurance


Endurance training zones

Endurance training zones


Training adaptations in lactate concentration

Training adaptations in lactate concentration


Homework

Homework

  • Design protocols for running MAOD (p67-68)

  • Design protocols for running lactate threshold (p84-89)

  • Design protocols for running VO2max (p113-114)

  • Chapter 26 Runners and walkers (p401-408)


  • Login