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. 2018 Oct 9;9:1415. doi: 10.3389/fphys.2018.01415

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Copyright © 2018 Andrade, Beltrán, Labarca-Valenzuela, Manzo-Botarelli, Trujillo, Otero-Farias, Álvarez, Garcia-Hermoso, Toledo, Del Rio, Silva-Urra and Ramírez-Campillo.

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) and the copyright owner(s) 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.

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Effect of 4 weeks plyometric training on a 2-km time-trial running test and 30 cm drop jump reactive strength index (RSI_DJ30). SL +4 week: sea level performance after 4 weeks of plyometric training; HA+4 week: performance after 24 h of high-altitude exposure (3,270-m over sea level) after 4 weeks of plyometric training. (A) Note that at SL +4 week the plyometric training group displayed an improvement in 2-km time-trial compared to the control group. At HA +4 week, the control group displayed a reduction in 2-km time-trial performance compared to sea level, and the plyometric training group showed a better performance compared to the control group. (B) At SL +4 week and at HA +4 week the plyometric training group displayed an improvement in RSI compared to the control group. ANOVA with 2 factors, followed by Holm-Sidak post hoc; ^∗p < 0.05. Dotted line reflects baseline performance at sea-level.