Effects of high-intensity intermittent cross-training on maximal oxygen uptake
We investigated the effects of high-intensity intermittent cross-training (HIICT) on maximal oxygen uptake (V˙O2max). The HIICT consisted of alternating intermittent 20-s treadmill running (1st, 3rd, 5th, and 7th bouts) and 20-s bicycle exercise (2nd, 4th, and 6th bouts) with a 10-s rest period. Eac...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2025-05-01
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| Series: | Sports Medicine and Health Science |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666337624001215 |
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| Summary: | We investigated the effects of high-intensity intermittent cross-training (HIICT) on maximal oxygen uptake (V˙O2max). The HIICT consisted of alternating intermittent 20-s treadmill running (1st, 3rd, 5th, and 7th bouts) and 20-s bicycle exercise (2nd, 4th, and 6th bouts) with a 10-s rest period. Each intensity for running and bicycling of the HIICT corresponded to an oxygen demand of ∼160% and ∼170% of the V˙O2max, respectively. Fifteen healthy young males (aged [24 ± 1] yrs) were randomly assigned to training (TG, n = 8) and non-training control (CG, n = 7) groups. The TG completed this HIICT daily 4 days/week for 6 weeks. Significant group × time interactions were observed for both the running and bicycling V˙O2max (p < 0.001 each). After the training, the V˙O2max for both running ([57.4 ± 4.8] mL·kg−1·min−1) and bicycling ([50.6 ± 3.7] mL·kg−1·min−1) in the TG were significantly higher than those for running ([50.1 ± 3.1] mL·kg−1·min−1) and bicycling ([43.7 ± 3.6] mL·kg−1·min−1) in the CG, respectively (p < 0.01 each). Post-hoc tests revealed a significant increase in V˙O2max for running and bicycling in the TG after the HIICT (p < 0.001 each) but no significant difference in the CG. These results demonstrated that the newly developed HIICT increases the V˙O2max for both running and bicycling. |
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| ISSN: | 2666-3376 |