TY - JOUR
T1 - Methods to match high-intensity interval exercise intensity in hypoxia and normoxia – A pilot study
AU - Li, Yanchun
AU - Li, Jia
AU - Atakan, Muhammed M.
AU - Wang, Zhenhuan
AU - Hu, Yang
AU - Nazif, Mostafa
AU - Zarekookandeh, Navabeh
AU - Ye, Henry Zhihong
AU - Kuang, Jujiao
AU - Ferri, Alessandra
AU - Petersen, Aaron
AU - Garnham, Andrew
AU - Bishop, David J.
AU - Girard, Olivier
AU - Huang, Yaru
AU - Yan, Xu
N1 - Funding Information:
Y.L., Y·H, D.J.B. and X.Y. are supported by an international collaborative grant from Beijing Sport University ( 2018GJ005 ). Y. L. is supported by a grant from National Natural Science Foundation of China ( 31771317 ). X.Y. is supported by a seed grant from Australia Institute for Musculoskeletal Sciences . M.M.A. is funded by the Scientific and Technological Research Council of Turkey (TUBITAK) 2214-A research fellowship.
Publisher Copyright:
© 2021 The Society of Chinese Scholars on Exercise Physiology and Fitness
PY - 2022/1
Y1 - 2022/1
N2 - Objectives: The aim of this study was to compare high-intensity interval exercise (HIIE) sessions prescribed on the basis of a maximal value (peak power output, PPO) and a submaximal value (lactate threshold, LT) derived from graded exercise tests (GXTs) in normoxia and hypoxia. Methods: A total of ten males (aged 18–37) volunteered to participate in this study. The experimental protocol consisted of a familiarization procedure, two GXTs under normoxia (FiO2 = 0.209) and two GXTs under normobaric hypoxia (FiO2 = 0.140), and three HIIE sessions performed in a random order. The HIIE sessions included one at hypoxia (HY) and two at normoxia (one matched for the absolute intensity in hypoxia, designated as NA, and one matched for the relative intensity in hypoxia, designated as NR). Results: The data demonstrated that there was significant lower peak oxygen uptake (V̇O2peak), peak heart rate (HRpeak), PPO, and LT derived from GXTs in hypoxia, with higher respiratory exchange ratio (RER), when compared to those from GXTs performed in normoxia (p < 0.001). Among the three HIIE sessions, the NA session resulted in lower percentage of HRpeak (85.0 ± 7.5% vs 94.4 ± 5.0%; p = 0.002) and V̇O2peak (74.1 ± 9.1% vs 88.7 ± 7.7%; p = 0.005), when compared to the NR session. HIIE sessions in HY and NR resulted in similar percentage of HRpeak and V̇O2peak, as well as similar rating of perceived exertion and RER. The blood lactate level increased immediately after all the three HIIE sessions (p < 0.001), while higher blood lactate concentrations were observed immediately after the HY (p = 0.0003) and NR (p = 0.014) sessions when compared with NA. Conclusion: Combining of PPO and LT derived from GXTs can be used to prescribe exercise intensity of HIIE in hypoxia.
AB - Objectives: The aim of this study was to compare high-intensity interval exercise (HIIE) sessions prescribed on the basis of a maximal value (peak power output, PPO) and a submaximal value (lactate threshold, LT) derived from graded exercise tests (GXTs) in normoxia and hypoxia. Methods: A total of ten males (aged 18–37) volunteered to participate in this study. The experimental protocol consisted of a familiarization procedure, two GXTs under normoxia (FiO2 = 0.209) and two GXTs under normobaric hypoxia (FiO2 = 0.140), and three HIIE sessions performed in a random order. The HIIE sessions included one at hypoxia (HY) and two at normoxia (one matched for the absolute intensity in hypoxia, designated as NA, and one matched for the relative intensity in hypoxia, designated as NR). Results: The data demonstrated that there was significant lower peak oxygen uptake (V̇O2peak), peak heart rate (HRpeak), PPO, and LT derived from GXTs in hypoxia, with higher respiratory exchange ratio (RER), when compared to those from GXTs performed in normoxia (p < 0.001). Among the three HIIE sessions, the NA session resulted in lower percentage of HRpeak (85.0 ± 7.5% vs 94.4 ± 5.0%; p = 0.002) and V̇O2peak (74.1 ± 9.1% vs 88.7 ± 7.7%; p = 0.005), when compared to the NR session. HIIE sessions in HY and NR resulted in similar percentage of HRpeak and V̇O2peak, as well as similar rating of perceived exertion and RER. The blood lactate level increased immediately after all the three HIIE sessions (p < 0.001), while higher blood lactate concentrations were observed immediately after the HY (p = 0.0003) and NR (p = 0.014) sessions when compared with NA. Conclusion: Combining of PPO and LT derived from GXTs can be used to prescribe exercise intensity of HIIE in hypoxia.
KW - Exercise prescription
KW - High-intensity interval exercise
KW - Hypoxia
KW - Lactate threshold
KW - Peak power output
UR - http://www.scopus.com/inward/record.url?scp=85122075626&partnerID=8YFLogxK
U2 - 10.1016/j.jesf.2021.12.003
DO - 10.1016/j.jesf.2021.12.003
M3 - Article
C2 - 35024050
AN - SCOPUS:85122075626
SN - 1728-869X
VL - 20
SP - 70
EP - 76
JO - Journal of Exercise Science and Fitness
JF - Journal of Exercise Science and Fitness
IS - 1
ER -