Six-Minute Walk distance increased with combined dAIH + walking vs dSHAM + walking after 5 days ( MD 94.4 m , 95 % CI 17.5-171 .3 m , p = 0.017 ) and 1-week follow-up ( MD 97.0 m , 95 % CI 20.1-173 .9 m , p = 0.014 ) .