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Purpose <p>Post-exercise lactate recovery kinetics during growth remain poorly characterized, particularly in girls, limiting understanding of how age interacts with sex-specific metabolic adaptations. This study examined age- and sex-related differences in blood lactate recovery following high-intensity exercise from childhood to adolescence, focusing on lactate exchange (<i>γ</i>₁) and removal (<i>γ</i>₂) capacities.</p> Methods <p>Seventy-six trained participants (41 boys, 35 girls) aged 10–17&#xa0;years completed a 60 s all-out rowing test. Participants were stratified into four age groups: 10.0–11.9, 12.0–13.9, 14.0–15.9, and 16.0–17.9&#xa0;years. Blood lactate concentrations were monitored over a 60-min passive recovery period and analyzed using the biexponential Freund model to estimate <i>γ</i>₁ and <i>γ</i>₂. End-exercise ([La]<sub>end</sub>) and peak ([La]<sub>max</sub>) lactate concentrations were measured, and absolute lactate quantities were calculated relative to lean body mass (QLa<sub>end</sub>, QLa<sub>max</sub>).</p> Results <p>Blood lactate concentrations and quantities increased with age, with boys showing higher QLa<sub>end</sub> and QLa<sub>max</sub> from 14&#xa0;years onward (<i>p</i> &lt; 0.001), likely reflecting greater lean mass and power output. Both <i>γ</i>₁ and <i>γ</i>₂ declined significantly with age (from 16 and 14&#xa0;years, respectively; <i>p</i> &lt; 0.05), indicating reduced lactate handling capacities. Girls consistently exhibited higher γ₁ values than boys (<i>p</i> &lt; 0.001), which may indicate more favorable lactate exchange characteristics.</p> Conclusions <p>This study provides the first detailed characterization of post-exercise lactate recovery kinetics in growing girls, offering novel insight into female-specific metabolic adaptations and their interplay with age. These developmental patterns enhance understanding of age-associated metabolic adaptations and may inform sex- and age-tailored training strategies in pediatric populations.</p>

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Sex- and age-specific blood lactate recovery kinetics after high-intensity exercise in trained youth: a model-based analysis

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Joffrey Bardin,
  • Hugo Maciejewski,
  • Allison Diry,
  • Anthony J. Blazevich,
  • Claire Thomas,
  • Sébastien Ratel

摘要

Purpose

Post-exercise lactate recovery kinetics during growth remain poorly characterized, particularly in girls, limiting understanding of how age interacts with sex-specific metabolic adaptations. This study examined age- and sex-related differences in blood lactate recovery following high-intensity exercise from childhood to adolescence, focusing on lactate exchange (γ₁) and removal (γ₂) capacities.

Methods

Seventy-six trained participants (41 boys, 35 girls) aged 10–17 years completed a 60 s all-out rowing test. Participants were stratified into four age groups: 10.0–11.9, 12.0–13.9, 14.0–15.9, and 16.0–17.9 years. Blood lactate concentrations were monitored over a 60-min passive recovery period and analyzed using the biexponential Freund model to estimate γ₁ and γ₂. End-exercise ([La]end) and peak ([La]max) lactate concentrations were measured, and absolute lactate quantities were calculated relative to lean body mass (QLaend, QLamax).

Results

Blood lactate concentrations and quantities increased with age, with boys showing higher QLaend and QLamax from 14 years onward (p < 0.001), likely reflecting greater lean mass and power output. Both γ₁ and γ₂ declined significantly with age (from 16 and 14 years, respectively; p < 0.05), indicating reduced lactate handling capacities. Girls consistently exhibited higher γ₁ values than boys (p < 0.001), which may indicate more favorable lactate exchange characteristics.

Conclusions

This study provides the first detailed characterization of post-exercise lactate recovery kinetics in growing girls, offering novel insight into female-specific metabolic adaptations and their interplay with age. These developmental patterns enhance understanding of age-associated metabolic adaptations and may inform sex- and age-tailored training strategies in pediatric populations.