Ais chapter 6 blood lactate thresholds
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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

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AIS Chapter 6 Blood lactate thresholds

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AIS Chapter 6Blood lactate thresholds


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

  • Recycling of NAD (NADH  NAD)

  • So that glycolysis can continue

  • LDH: lactate dehydrogenase 乳酸去氫脢


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


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


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


Individualized lactate threshold

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


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


LT2 occurs at different lactate concentrations for difference exercise modes


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

  • 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


Training adaptations in lactate concentration


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)


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