The acute physiological and perceptual effects of recovery interval intensity during cycling-based high-intensity interv
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ORIGINAL ARTICLE
The acute physiological and perceptual effects of recovery interval intensity during cycling‑based high‑intensity interval training Christopher R. J. Fennell1 · James G. Hopker1 Received: 4 May 2020 / Accepted: 13 October 2020 © The Author(s) 2020
Abstract Purpose The current study sought to investigate the role of recovery intensity on the physiological and perceptual responses during cycling-based aerobic high-intensity interval training. ̇ 2peak : 62 ± 9 mL kg−1 min−1) completed seven laboratory visits. At visit 1, the Methods Fourteen well-trained cyclists ( VO ̇ 2peak ) and lactate thresholds were determined. At visits 2–7, participants comparticipants’ peak oxygen consumption ( VO pleted either a 6 × 4 min or 3 × 8 min high-intensity interval training (HIIT) protocol with one of three recovery intensity prescriptions: passive (PA) recovery, active recovery at 80% of lactate threshold (80A) or active recovery at 110% of lactate threshold (110A). Results The time spent at > 80%, > 90% and > 95% of maximal minute power during the work intervals was significantly increased with PA recovery, when compared to both 80A and 110A, during both HIIT protocols (all P ≤ 0.001). However, ̇ 2peak (P = 0.11) or > 95% VO ̇ 2peak (P = 0.50) during the work recovery intensity had no effect on the time spent at > 90% VO intervals of both HIIT protocols. Session RPE was significantly higher following the 110A recovery, when compared to the PA and 80A recovery during both HIIT protocols (P 4 mmol L−1. Participants completed a cool down for 10 min at 50 W, after which they completed seated rest for 10 min, before coṁ 2max test protocol. mencing the VO During the LT test B[La], samples were collected using fingertip capillary blood 30 s before the end of each stage. Blood samples were analysed using a Biosen C-Line (EKF Diagnostic, London, UK). PO and HR were continuously measured throughout the test, and rating of perceived exertion (RPE) measurements were asked at the end of each stage using the Borg 6 to 20-point scale (Borg 1982). The first LT was assessed as the point at which B[La] breaks from linearity (Yoshida et al. 1987). The lactate turnpoint (LTP) was assessed as the second break point after which B[La] begins to rise above 4 mmol L−1 (Faude et al. 2009). ̇ 2max test protocol started with a 10-min warm-up The VO at 100 W, after which the required cycling PO was increased by 20 W every 1 min until the participant reached volitional exhaustion (operationally defined as a cadence of 5 s, despite strong verbal encouragement). PO and HR were measured continuously throughout the test, with RPE measurements taken in the last 10 s of each 1-min ̇ 2peak was stage of the test (Borg 1982). The participant’s VO assessed as the highest pulmonary oxygen consumption ̇ 2 ) that was attained during a 1-min period in the test. ( VO Maximal minute power (MMP) and maximal minute heart rate (HRmax) were assessed as the highest mean 1-min PO and HR achieved during the test.
HIIT sessions Participants completed both
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