Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Changes in medial (mPFC) and dorsolateral prefrontal cortex (dlPFC) O2Hb from the first (Q1) to the last quintile (Q5) of the single task durations: preferred paced walking (upper panel) and spelling backwards for 60 s (lower panel). Means and SE are shown. Horizontal bars indicate the main effects between Q1 and Q5 (mixed 2-way ANOVA). * COPD different than age-matched controls at p < 0.05.
