To test the effect of combined intermittent hypoxia (IH) and body weight–supported treadmill training (BWSTT) on standing and dynamic balance in persons with incomplete spinal cord injury (iSCI).
Randomized, triple-blind, placebo-controlled study.
Rehabilitation medical centers.
Study participants (N=35) with chronic iSCI with American Spinal Injury Association grades C and D (>1y postinjury) were randomly assigned to either IH plus BWSTT (n=18) or continued normoxia (placebo) plus BWSTT protocol (n=17).
Participants received either IH (alternating 1.5min 9% inspired O2 with 1.5min 21% inspired O2, 15 cycles per day) or continued normoxia (21% O2) combined with 45 minutes of BWSTT for 5 consecutive days, followed by 3 times per week IH or normoxia plus BWSTT, for 3 additional weeks.
Main Outcome Measures
Standing balance (normalized jerk and root-mean-square [RMS]) and dynamic balance (turning duration, cadence in a turn, and turn-to-sit duration) were assessed before and after IH and normoxia protocol by means of instrumented sway and instrumented timed Up and Go test.
There was no significant difference in standing balance between interventions for both normalized jerk and RMS instrumented sway components (both P>.05). There was a significantly faster cadence (P<.001), turning duration (P<.001), and turn-to-sit duration (P=.001) in subjects receiving IH plus BWSTT, compared with placebo.
A 4-week protocol of IH combined with locomotor training improves dynamic, but not standing, balance in persons with iSCI.
List of abbreviations:ASIA (American Spinal Injury Association), BBS (Berg Balance Scale), BWSTT (body weight–supported treadmill training), CI (confidence interval), IH (intermittent hypoxia), IQR (interquartile range), iSCI (incomplete spinal cord injury), SCI (spinal cord injury), RMS (root-mean-square), TUG (timed Up and Go)
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Published online: October 01, 2016
Supported by the Fondecyt Grant, National Commission of Scientific and Technological Research, Chile (grant no. 11140120).
Clinical Trial Registration No.: NCT02441179.
© 2016 by the American Congress of Rehabilitation Medicine