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Evaluation of Blood Lactate and Plasma Insulin During High-intensity Exercise by Antecubital Vein Catheterization
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Lactate Kinetics during Multiple Set Resistance Exercise.

Nicolas Wirtz1, Patrick Wahl1, Heinz Kleinöder1

  • 1Institute of Training Science and Sport Informatics, and The German Research Centre of Elite Sport, German Sport University Cologne , Germany.

Journal of Sports Science & Medicine
|February 27, 2014
PubMed
Summary
This summary is machine-generated.

Blood lactate concentration surprisingly decreased during resistance exercise sets, increasing only during recovery. This suggests rapid lactate metabolism or blood shifts, challenging traditional views of exercise-induced lactate accumulation.

Keywords:
Muscle-to-blood lactate gradientmetabolismstrength training

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Area of Science:

  • Exercise Physiology
  • Metabolic Stress
  • Lactate Kinetics

Background:

  • Blood lactate concentration ([La]) is a key indicator of metabolic stress during intense exercise.
  • Lactate dynamics depend on production, transport, metabolism, and elimination.
  • Understanding [La] changes during resistance training is crucial for optimizing exercise protocols.

Purpose of the Study:

  • To investigate the influence of varying resistance exercise volumes on blood lactate concentration ([La]).
  • To compare the effects of different resistance exercise protocols (Arm Curl, Leg Extension) on [La] kinetics.

Main Methods:

  • Ten male subjects performed 3 sets of resistance exercises (Arm Curl, Leg Extension) with 1 or 2 limbs at a standardized velocity and 10RM load.
  • Blood lactate samples were collected immediately before and after each set.
  • Exercise protocols included Arm Curl (1 or 2 arms) and Leg Extension (1 or 2 legs).

Main Results:

  • Maximum [La] was significantly higher after 2-leg Leg Extension (LE2) and lower after 1-arm Arm Curl (AC1).
  • Blood [La] unexpectedly decreased during the 2nd and 3rd sets of Leg Extension and the 3rd set of Arm Curl.
  • [La] increased primarily during recovery phases, not during the exercise sets themselves.

Conclusions:

  • Blood lactate concentration declines during later sets of resistance exercise, contrary to expectations.
  • Rapid decreases in [La] may be attributed to lactate uptake and metabolism by distal muscles or organs.
  • Blood volume shifts and muscle-to-blood gradients could explain the rapid [La] changes observed during exercise.