Repeated Sprint Training in Normobaric Hypoxia
Condition: Hypoxia
MeSH terms: Hypoxia
Study type: Interventional

Summary: 
      The aim of the current study was to examine the effects of 3-session repeated sprint training
      performed in a normobaric hypoxic condition with 48-hour rest intervals on sprint performance
      indices, arterial oxygen saturation (SpO2) and rating of perceived exertion (RPE) scores.
      Twenty-four moderately-trained males participated in this study voluntarily basis. This study
      was conducted on single-blind placebo-controlled design. Participants were divided into three
      groups as follows; normobaric hypoxia (3420 m; HYP), normobaric normoxia (162 m; PLA) and
      control group (CON). HYP and PLA groups subjected to 3 repeated sprint training session (4
      set x 5 x 5 s sprints with 30 s recovery and 5 min rest between the sets) in normobaric
      hypoxia or normoxia condition. Pre- and pos-test were conducted 72 hours before and after the
      training intervention period. All the training and testing sessions performed in cycle
      ergometer. There were no detected significant time and condition interaction in the
      variables; relative peak power output (PPO), mean power output (MPO), percentage of sprint
      decrement score (Sdec%) and RPE observed in the scope of pre- and post-test.
    

Detailed description: 
      This single-blind placebo-controlled designed study was approved by Ankara University Human
      Research Ethics Committee (2020/277) and conducted in accordance with the Declaration of
      Helsinki. The participants in normobaric hypoxia (HYP) and placebo (PLA) groups visited the
      laboratory six times and the control (CON) group visited three times. At the first visit of
      participants, the aim and the possible outcomes of the research was explained, the
      familiarization process for cycle ergometer and test/training protocol was performed, and the
      informed consent forms were obtained. The participants were divided randomly into three
      groups after the anthropometric measurements and baseline tests were completed so as part of
      the second visit. The groups were divided as follows; HYP group (n=9) which were exposed to
      normobaric hypoxia equal to 3420 m (FiO2: 13.5-13.6 %), PLA (n=7) that were exposed to
      normobaric normoxia equal to 162 m (FiO2: 20.9 %) through wearing the altitude generator
      mask, and the control group (CON; n=8) which was subjected to only pre and post-test. The
      determined hypoxic dose for HYP group was directly implemented (setting 9 was equal to 3420 m
      on used hypoxia generator), and no correction was made for the actual altitude (900 m,
      Golbasi, Ankara, Türkiye). The normobaric hypoxia and placebo condition was provided by
      Everest Summit II-Altitude Generator (Hypoxico Hypoxicator, New York, USA). At the 3rd-5th
      visits, HYP and PLA groups performed 3 repeated sprint training sessions under normobaric
      hypoxia or normoxia exposure with 48-hour intervals. And the participants visited the
      laboratory last time for post-test measurements. Each participant visited the laboratory for
      training sessions and test trials at the same time in the day. In the scope of pre and
      post-test repeated sprint indices, SpO2 and RPE data were collected. Pre-test and post-test
      were conducted 72 hours before and 72 hours after the training intervention period in
      normobaric normoxia condition. Including the testing days, the intervention period lasted 11
      days in November 2022. All the experimental processes were conducted in Ankara University
      Performance Laboratory.
    

Intervention name(s): Normobaric Hypoxia Exposure; Normobaric Normoxia Exposure
Intervention type(s): Device; Device
Intervention description(s): Hypoxia group were exposed to normobaric hypoxia equal to 3420 m (FiO2: 13.5-13.6 %).; Placebo group were exposed to normobaric normoxia equal to 162 m (FiO2: 20.9 %) through wearing the altitude generator mask.
Allocation: Randomized
Intervention model: Parallel Assignment
Intervention model description: single-blind placebo-controlled design
Masking: Single (Participant)
Primary purpose: Other
Keywords: normobaric hypoxia; repeated sprint training