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Intermittent Hypoxia and Balance Control

NCT05463042 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 3

Last updated 2023-11-29

No results posted yet for this study

Summary

This study aims to determine the effect of acute mild intermittent hypoxia on ankle plantarflexor muscle output during balance regulation and walking in younger and older adults. Fifteen younger adults and 15 older adults will be recruited to participate in the cross-over design study that requires 2 visits (at least 1-week apart). Participants will be pseudo-randomly assigned to receive either intermittent hypoxia or sham during the first visit, and then switch over to receive sham or intermittent hypoxia during the 2nd visit. Muscle activation patterns and kinetic and kinematics during standing and walking will be recorded before and after the intermittent hypoxia/sham. It is hypothesized that compared to the sham condition, both younger and older participants will show greater increases in ankle plantarflexor muscle activation during gait and balance assessments following intermittent hypoxia.

Conditions

  • Intermittent Hypoxia
  • Normoxia

Interventions

BEHAVIORAL

Intermittent Hypoxia

During the intermittent hypoxia session, participants will be sitting during the entire breathing protocol. Hypoxic air will be inhaled through a mask connected to a two-way non-rebreathing valve, which will itself be connected to a 5-liter non-diffusing gas bag (Hans Rudolph, Inc, USA). The rebreathing bag will be connected to a certified medical grade gas tank containing 11% oxygen and a balance of nitrogen. The intermittent hypoxia protocol will consist of eight 4-min cycles of breathing hypoxic air interspersed with normoxic cycles breathing room air. After four min of hypoxia, participants will be switched back to breathing room air until resaturation, which takes approximately one minute. Once arterial oxygen saturation reaches baseline levels, participants will be switched back to breathing hypoxic air, beginning the next hypoxic cycle.

BEHAVIORAL

Normoxia (sham)

During the sham condition, compressed air (21% oxygen) from a gas tank will be delivered throughout the protocol instead of 11% oxygen. Participants will not receive information about which condition (Intermittent hypoxia or sham) they are experiencing during the trials.

Sponsors & Collaborators

  • University of Texas at Austin

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Model
CROSSOVER

Eligibility

Min Age
18 Years
Max Age
80 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2022-09-01
Primary Completion
2023-08-21
Completion
2023-08-21

Countries

  • United States

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05463042 on ClinicalTrials.gov