The effects of training with High Speed Interval running on muscle performance are modulated by slope

Theofilidis, George, Bogdanis, Gregory C., Stavropoulos-Kalinoglou, Antonios, Krase, Argyro, Tsatalas, Themistoklis, Shum, Gary L., Sakkas, Giorgos K., Koutedakis, Yiannis and Karatzaferi, Christina (2020) The effects of training with High Speed Interval running on muscle performance are modulated by slope. Physiological Reports. ISSN 2051-817X (In Press)

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Abstract

Objective: We examined changes in selected muscle performance parameters after 8 weeks of interval 20 training using two opposite running inclinations. We hypothesized that the uphill training will affect endurance muscle performance outcomes, while the downhill training will affect power muscle performance outcomes. Methods: Fourteen physically active volunteers were randomly assigned into either the Uphill group (UG; n=7; uphill interval running at +10% incline) or the Downhill group (DG; n=7; downhill interval running at -10% incline) and completed 16 training sessions. Each session consisted of ten 30 s treadmill runs at 90% of maximum aerobic speed (MAS) with a work to rest ratio of 1:2. Vertical jump performance, isometric (MVC) and isokinetic torque of knee extensors and flexors, and fatigue of knee extensors were evaluated pre- and post-training. Moreover, body composition (via bio-impedance) and vastus lateralis muscle architecture (via ultrasonography) were assessed pre- and post-training. Results: Relative lean tissue mass, relative fat mass and squat jump (cm) significantly (p<0.05) changed from baseline values by + 4.5 ± 4.0 %, - 11.5 ± 9.6 % and +9.5 ± 11.7%, respectively only in the DG. Similarly, DG improved absolute values of knee extension rate of torque development and impulse (p<0.05), while knee flexion peak torque angle significantly decreased in both groups (p<0.05). On the other hand, the UG increased the number of repetitions achieved during the fatigue protocol and total work by 21.2 ± 32.6 % and 13.8 ± 21.2%, respectively (p < 0.05). No differences were found between groups in muscle architecture. Conclusion: Introducing variations in slope during HIIT could be used to induce specific improvements towards muscle endurance or power performance characteristics.

Item Type:	Article
Keywords:	interval training, optimization of training, muscle power, fatigue, concurrent training.
Depositing User:	Ms Raisa Burton
Date Deposited:	04 Dec 2020 12:12
Last Modified:	13 Jan 2021 09:32
URI:	https://marjon.repository.guildhe.ac.uk/id/eprint/17631

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