Fig. 1From: Ventilation dynamics using a portable device coupled to the six-minute walk test in people with long-COVID syndrome: a preliminary studyRelationship of six-minute walking distance (6MWD) with the difference between resistance at 4–20 Hz (R4-R20, rs=-0.499, P = 0.039) (A) and the peak oxygen uptake (VO2peak, rs=0.628, P = 0.009) (B)Back to article page