Inter-individual variability in performance benefits from repeated sprint training in hypoxia and associated training parameters
This study examined whether inter-individual variability exists in repeated sprint training in hypoxia (RSH) and how peripheral oxygen saturation (SpO2) affects physiological demands and mechanical output, and subsequent training outcomes. Sixteen highly-trained sprint runners completed six sessions...
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Frontiers Media S.A.
2025-04-01
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| Series: | Frontiers in Sports and Active Living |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fspor.2025.1524437/full |
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| author | Naoya Takei Naoya Takei Ryuji Muraki Olivier Girard Hideo Hatta |
| author_facet | Naoya Takei Naoya Takei Ryuji Muraki Olivier Girard Hideo Hatta |
| author_sort | Naoya Takei |
| collection | DOAJ |
| description | This study examined whether inter-individual variability exists in repeated sprint training in hypoxia (RSH) and how peripheral oxygen saturation (SpO2) affects physiological demands and mechanical output, and subsequent training outcomes. Sixteen highly-trained sprint runners completed six sessions of RSH consisting of two sets of 5 × 10-s all-out sprints (fraction of inspired oxygen: 0.15), with pre- and post-tests involving 10 × 10-s all-out sprints in normoxia. Average SpO2, training impulse (TRIMP), and relative total work (relative TW; standardized by pre-test TW) during training sessions were calculated. After the intervention, MPO increased by +3.8% (P = 0.001) and sprint decrement score by +6.0% (P = 0.047). However, inter-individual variability in performance improvement observed and nearly 20% of participants did not obtain performance benefit. Average SpO2 during training sessions correlated significantly with relative TW (r = 0.435, P = 0.008), indicating that participants with higher SpO2 performed more work during training. Relative TW was strongly correlated with performance improvement (r = 0.833, P < 0.001), suggesting that those who produced more work during training experienced greater performance gains. TRIMP showed no significant correlation with SpO2 or performance improvement. In summary, greater peripheral deoxygenation leads to lower mechanical work and consequently smaller performance improvement following RSH. The variability in peripheral deoxygenation and relative TW among highly-trained sprint runners may contribute to the heterogeneous training effects observed. |
| format | Article |
| id | doaj-art-0da97a42f4244d7caeccbbe2aa4329a7 |
| institution | DOAJ |
| issn | 2624-9367 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Sports and Active Living |
| spelling | doaj-art-0da97a42f4244d7caeccbbe2aa4329a72025-08-20T03:08:29ZengFrontiers Media S.A.Frontiers in Sports and Active Living2624-93672025-04-01710.3389/fspor.2025.15244371524437Inter-individual variability in performance benefits from repeated sprint training in hypoxia and associated training parametersNaoya Takei0Naoya Takei1Ryuji Muraki2Olivier Girard3Hideo Hatta4Research Institute of Physical Fitness, Japan Women’s College of Physical Education, Tokyo, JapanDepartment of Sports Sciences, The University of Tokyo, Tokyo, JapanDepartment of Sports Science, Surugadai University, Saitama, JapanSchool of Human Sciences (Exercise and Sport Science), University of Western Australia, Perth, WA, AustraliaDepartment of Sports Sciences, The University of Tokyo, Tokyo, JapanThis study examined whether inter-individual variability exists in repeated sprint training in hypoxia (RSH) and how peripheral oxygen saturation (SpO2) affects physiological demands and mechanical output, and subsequent training outcomes. Sixteen highly-trained sprint runners completed six sessions of RSH consisting of two sets of 5 × 10-s all-out sprints (fraction of inspired oxygen: 0.15), with pre- and post-tests involving 10 × 10-s all-out sprints in normoxia. Average SpO2, training impulse (TRIMP), and relative total work (relative TW; standardized by pre-test TW) during training sessions were calculated. After the intervention, MPO increased by +3.8% (P = 0.001) and sprint decrement score by +6.0% (P = 0.047). However, inter-individual variability in performance improvement observed and nearly 20% of participants did not obtain performance benefit. Average SpO2 during training sessions correlated significantly with relative TW (r = 0.435, P = 0.008), indicating that participants with higher SpO2 performed more work during training. Relative TW was strongly correlated with performance improvement (r = 0.833, P < 0.001), suggesting that those who produced more work during training experienced greater performance gains. TRIMP showed no significant correlation with SpO2 or performance improvement. In summary, greater peripheral deoxygenation leads to lower mechanical work and consequently smaller performance improvement following RSH. The variability in peripheral deoxygenation and relative TW among highly-trained sprint runners may contribute to the heterogeneous training effects observed.https://www.frontiersin.org/articles/10.3389/fspor.2025.1524437/fullinter-individual variabilitysimulated altitudenon-responderoxygen saturationrepeated sprint training in hypoxia |
| spellingShingle | Naoya Takei Naoya Takei Ryuji Muraki Olivier Girard Hideo Hatta Inter-individual variability in performance benefits from repeated sprint training in hypoxia and associated training parameters Frontiers in Sports and Active Living inter-individual variability simulated altitude non-responder oxygen saturation repeated sprint training in hypoxia |
| title | Inter-individual variability in performance benefits from repeated sprint training in hypoxia and associated training parameters |
| title_full | Inter-individual variability in performance benefits from repeated sprint training in hypoxia and associated training parameters |
| title_fullStr | Inter-individual variability in performance benefits from repeated sprint training in hypoxia and associated training parameters |
| title_full_unstemmed | Inter-individual variability in performance benefits from repeated sprint training in hypoxia and associated training parameters |
| title_short | Inter-individual variability in performance benefits from repeated sprint training in hypoxia and associated training parameters |
| title_sort | inter individual variability in performance benefits from repeated sprint training in hypoxia and associated training parameters |
| topic | inter-individual variability simulated altitude non-responder oxygen saturation repeated sprint training in hypoxia |
| url | https://www.frontiersin.org/articles/10.3389/fspor.2025.1524437/full |
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