Scholarlink

Purpose <p>Performance in endurance sports is generally linked to aerobic capacity, but this link is less clear in swimming due to its technical complexity and constricted breathing periods. Here, we studied the effect of a moderate acute reduction in blood oxygen transport capacity on middle-distance swimming performance.</p> Methods <p>In a double-blind, randomized crossover design, national-level swimmers (6 men, 6 women; 20 ± 2 years; FINA score 604 ± 105) completed two 200&#xa0;m front crawl swimming time-trials (TT) on average six days apart, either 30&#xa0;min after rebreathing moderate (men: 1.5&#xa0;ml·kg<sup>− 1</sup>, women: 1.2&#xa0;ml·kg<sup>− 1</sup>; CO) or small (SHAM) CO dose. Capillary blood lactate and hemoglobin CO binding (%HbCO) were measured before and after the TT.</p> Results <p>HbCO was ~ 9% in CO and ~ 3% in SHAM. Analysis at the group level showed 1.5 ± 1.6% longer TT times in CO than in SHAM in men (136.6 ± 6.5 vs. 134.5 ± 6.2&#xa0;s; <i>p</i> = 0.018), whereas there was no significant difference in women. The average increase in blood lactate during TT (10.5–13.5 mmol·l<sup>− 1</sup>) did not differ between conditions. Analysis at the individual level showed longer swimming TT times in the CO than in the SHAM condition (range: 1.1 to 5.0&#xa0;s) in eight of the twelve participants.</p> Conclusion <p>We observed a small negative effect of moderate acute hypoxemia on middle-distance swimming speed in male national-level swimmers, which will have a limited impact on a population basis but can be highly important for an individual competitive swimmer.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Moderate altitude-mimicking CO-induced inhibition of hemoglobin oxygen binding decreased middle-distance swimming speed in male national-level swimmers

  • 期刊论文

  • 发表日期：

    2026年7月3日

查看全文
  • Tomas Venckunas,
  • Justas Achramavicius,
  • Hakan Westerblad,
  • Viktorija Maconyte,
  • Ilona Judita Zuoziene,
  • Inga Pravdinskiene,
  • Carsten Lundby,
  • Arvydas Stasiulis

摘要

Purpose

Performance in endurance sports is generally linked to aerobic capacity, but this link is less clear in swimming due to its technical complexity and constricted breathing periods. Here, we studied the effect of a moderate acute reduction in blood oxygen transport capacity on middle-distance swimming performance.

Methods

In a double-blind, randomized crossover design, national-level swimmers (6 men, 6 women; 20 ± 2 years; FINA score 604 ± 105) completed two 200 m front crawl swimming time-trials (TT) on average six days apart, either 30 min after rebreathing moderate (men: 1.5 ml·kg− 1, women: 1.2 ml·kg− 1; CO) or small (SHAM) CO dose. Capillary blood lactate and hemoglobin CO binding (%HbCO) were measured before and after the TT.

Results

HbCO was ~ 9% in CO and ~ 3% in SHAM. Analysis at the group level showed 1.5 ± 1.6% longer TT times in CO than in SHAM in men (136.6 ± 6.5 vs. 134.5 ± 6.2 s; p = 0.018), whereas there was no significant difference in women. The average increase in blood lactate during TT (10.5–13.5 mmol·l− 1) did not differ between conditions. Analysis at the individual level showed longer swimming TT times in the CO than in the SHAM condition (range: 1.1 to 5.0 s) in eight of the twelve participants.

Conclusion

We observed a small negative effect of moderate acute hypoxemia on middle-distance swimming speed in male national-level swimmers, which will have a limited impact on a population basis but can be highly important for an individual competitive swimmer.