This study is aimed to (i) compare both the magnitude of impairment in exercise capacity and exercise responses measured during the six-minute walk test (6MWT) and the cardiopulmonary exercise test (CPET) and (ii) investigate the effect of test repetition on six-minute walk distance (6MWD) in people following curative intent treatment for non-small cell lung cancer (NSCLC). Twenty participants (67 + 10 years; 14 females), 6-10 weeks following lobectomy, underwent a CPET and two 6MWTs. Peak exercise responses, dyspnoea and leg fatigue, as well as heart rate (HR) and oxygen saturation (SpO 2 ) during the 6MWT, were compared to those during the CPET. Compared with exercise capacity when expressed as peak rate of oxygen consumption (%pred) measured during the CPET, exercise capacity when expressed as 6MWD (%pred) was less impaired (81 + 10 vs. 63 + 15 %pred; p < 0.001). Compared with the CPET, the 6MWT elicited lower peak HR (119 + 15 vs. 128 + 18 beats minute
À1; p ¼ 0.02), lower SpO 2 (93 + 2 vs. 95 + 3%; p < 0.05), less dyspnoea (3.1 + 1.6 vs. 6.9 + 2.6; p < 0.01) and less leg fatigue (2.0 + 1.9 vs. 6.8 + 2.4; p < 0.01). The 6MWD increased 19 + 19 metre (4 + 4%) with test repetition (p < 0.001). In people following curative intent treatment for NSCLC, the 6MWT appears to elicit sub-maximal exercise responses when compared with the CPET. There is a significant effect of test repetition on 6MWD.