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Influence of high-intensity interval training on adaptations in well-trained cyclists
journal contributionposted on 2023-05-16, 19:53 authored by Laursen, PB, Shing, CM, Peake, JM, Coombes, JS, Jenkins, DG
The purpose of the present study was to examine the influence of 3 different high-intensity interval training regimens on the first and second ventilatory thresholds (VT1 and VT2), anaerobic capacity (ANC), and plasma volume (PV) in well-trained endurance cyclists. Before and after 2 and 4 weeks of training, 38 well-trained cyclists (VÌ‡ O2peak = 64.5 Â± 5.2 mlÂ·kg-1Â·min -1) performed (a) a progressive cycle test to measure VÌ‡O2peak, peak power output (PPO), VT1, and VT 2; (b) a time to exhaustion test (Tmax) at their VÌ‡O2peak power output (Pmax); and (c) a 40-km time-trial (TT40). Subjects were assigned to 1 of 4 training groups (group 1: n = 8, 8 X 60% Tmax at Pmax, 1:2 work-recovery ratio; group 2: n = 9, 8 X 60% Tmax at Pmax, recovery at 65% maximum heart rate; group 3: n = 10, 12 x 30 seconds at 175% PPO, 4.5-minute recovery; control group: n = 11). The TT40 performance, VÌ‡O2peak, VT1, VT2, and ANC were all significantly increased in groups 1, 2, and 3 (p < 0.05) but not in the control group. However, PV did not change in response to the 4-week training program. Changes in TT40 performance were modestly related to the changes in VÌ‡O2peak, VT1, VT2, and ANC (r = 0.41, 0.34, 0.42, and 0.40, respectively; all p < 0.05). In conclusion, the improvements in TT40 performance were related to significant increases in VÌ‡O2peak, VT1, VT2, and ANC but were not accompanied by significant changes in PV. Thus, peripheral adaptations rather than central adaptations are likely responsible for the improved performances witnessed in well-trained endurance athletes following various forms of high-intensity interval training programs. Â© 2005 National Strength & Conditioning Association.
Publication titleJournal of Strength and Conditioning Research
Department/SchoolSchool of Health Sciences
PublisherHuman Kinetics Pub
Place of publicationUnited States