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ORIGINAL RESEARCH article

Front. Physiol.
Sec. Exercise Physiology
Volume 15 - 2024 | doi: 10.3389/fphys.2024.1407759

Respiratory Responses and Isocapnic buffering phase in child and youth soccer players during an Incremental Exercise Test The

Provisionally accepted
Selcen Korkmaz Eryılmaz Selcen Korkmaz Eryılmaz 1*Selçuk Karakaş Selçuk Karakaş 1Cumhur Boyraz Cumhur Boyraz 1Özgür Günaştı Özgür Günaştı 2Abdullah Kılcı Abdullah Kılcı 1Çiğdem Özdemir Çiğdem Özdemir 2Kerem Özgünen Kerem Özgünen 2Muhammed Emin KOÇ Muhammed Emin KOÇ 3Ümit Adaş Ümit Adaş 1Sadi Kurdak Sadi Kurdak 2
  • 1 Çukurova University, Adana, Türkiye
  • 2 Faculty of Medicine, Cukurova University, Adana, Adana, Türkiye
  • 3 Aksaray University, Aksaray, Aksaray, Türkiye

The final, formatted version of the article will be published soon.

    This study investigated the respiratory response and isocapnic buffering (IB) phase during an incremental exercise test to exhaustion in 16 child soccer players (11.9±0.9 years) and 18 youth soccer players (18.2±2.9 years). The IB phase was calculated as the difference in oxygen uptake (V ̇O2) between the respiratory compensation point (RCP) and metabolic threshold (MT) and expressed in either absolute or relative values.The maximal oxygen uptake (V ̇O2max) was higher in youth players than in child players. For youth players, V ̇O2max was measured at 55.9±3.6 ml min -1 kg -1 and 74.9±4.8 ml min -1 kg -0.75 , while for child players, V ̇O2max was 50.8±4.1 ml min -1 kg -1 and 67.2±6.1 ml min -1 kg -0.75 (p<0.001). MT and RCP occurred at 69.8±6.7% and 90.9±6.9% of V ̇O2max in child players and at 73.9±5.1% and 91.5±4.5% of V ̇O2max in youth players, respectively. The two groups had no significant difference (p>0.05). Absolute IB (10.6±2.8 vs. 9.7±3.1 ml min -1 kg -1 ), relative IB (23.1±5.7 vs 19.1±6.1), and the ratio of RCP V ̇O2 to MT V ̇O2 (1.3±0.09 vs. 1.24±0.09) were similar in child and youth players (p>0.05). There was no difference in minute ventilation (V ̇E, ml min -1 kg -1 ) and respiratory exchange ratio during exercise between the two groups (p>0.05). During exercise, respiratory frequency, ventilatory equivalent for carbon dioxide (V ̇E/V ̇CO2) and oxygen (V ̇E/V ̇O2), V ̇E/V ̇CO2 slope, end-tidal O2 pressure were higher in child players than in youth players, while tidal volume (L kg -1 ), O2 pulse, and end-tidal CO2 pressure were lower (p<0.05).3 Despite differences in aerobic capacity and ventilatory response to exercise, child players showed similar IB phase as youth players. Investigating the factors affecting MT and RC may provide more information than V ̇O2max to enlighten the physiological bases of the IB phase in detail for this age group.

    Keywords: Metabolic threshold, Respiratory compensation point, Oxygen Uptake, Ventilation, Cardiopulmonary exercise testing

    Received: 27 Mar 2024; Accepted: 10 Sep 2024.

    Copyright: © 2024 Korkmaz Eryılmaz, Karakaş, Boyraz, Günaştı, Kılcı, Özdemir, Özgünen, KOÇ, Adaş and Kurdak. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Selcen Korkmaz Eryılmaz, Çukurova University, Adana, Türkiye

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