Alternative strategies for exercise critical power estimation in patients with COPD |
| |
Authors: | Carla Malaguti Luiz E Nery Simone Dal Corso Marcelo Bicalho De Fuccio Maria Cristina Lerario Sonia Cendon J Alberto Neder |
| |
Institution: | (1) Pulmonary Function and Clinical Exercise Physiology Unit (SEFICE), Respiratory Division, Department of Medicine, Federal University of Sao Paulo-Paulista School of Medicine (UNIFESP-EPM), Rua Professor Francisco de Castro 54, Vila Clementino, CEP, 04020-050 Sao Paulo, Brazil |
| |
Abstract: | Exercise critical power (CP) has been shown to represent the highest sustainable work rate (WR) in patients with chronic obstructive
pulmonary disease (COPD). Parameter estimation, however, depends on 4 high-intensity tests performed, on different days, to
the limit of tolerance (T
lim). In order to establish a milder protocol that would be more suitable for disabled patients, we contrasted CP derived from
4, 3 and 2 tests (CP4, CP3 and CP2) in 8 males with moderate COPD. In addition, CP was calculated from 2 single-day tests performed on an inverse sequence (CP2AB and CP2BA): CP values within 5 W from CP4 were assumed as “clinically-acceptable” estimates. We found that CP4–CP3] and CP4–CP2] differences were within 5 W in 8 and 6 patients, respectively (95% confidence interval of the differences=−1.3 to 3.5 W
and −11.5 to 6.5 W). There was a systematic decline on T
lim when an exercise bout was performed after a previous test on the same day (P<0.05). Consequently, substantial differences were found between CP4 and any of the CP estimates obtained from single-day tests. In conclusion, clinically-acceptable estimates of CP can be obtained
by using 3 or, in most circumstances, 2 constant WR tests in patients with moderate COPD—provided that they are not performed
on the same day. |
| |
Keywords: | COPD Critical power Oxygen consumption Exercise capacity |
本文献已被 PubMed SpringerLink 等数据库收录! |
|