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J Sci Med Sport. 2013 Nov;16(6):539-44. doi: 10.1016/j.jsams.2013.01.010. Epub 2013 Mar 17.

A protocol to determine valid V˙O2max in young cystic fibrosis patients.

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Children's Health and Exercise Research Centre, Sport and Health Sciences, University of Exeter, UK; Royal Devon and Exeter NHS Foundation Trust Hospital, UK.



Measuring aerobic fitness (V˙O2max) via a maximal cardiopulmonary exercise test is an important clinical tool in cystic fibrosis. This study sought to establish: (1) the validity of traditional criteria to verify maximal efforts during a ramp cardiopulmonary exercise test; and (2) whether V˙O2 measured during an exhaustive cardiopulmonary exercise test represents a valid V˙O2max in paediatric patients, using a subsequent exhaustive supramaximal (Smax) exercise test.




Fourteen patients (7-18 years; 10 males) completed an exhaustive ramp test to determine V˙O2max. Following 15-min recovery, Smax (110% ramp peak power output) was performed.


Ramp test V˙O2peak was significantly higher than V˙O2 documented at traditional endpoint criteria, including a RER of 1.00 (0.99±0.47 L min(-1) vs. 1.83±0.78 L min(-1), p<0.001) and 1.10 (1.36±0.59 L min(-1) vs. 1.83±0.78 L min(-1), p<0.001), despite 100% of patients satisfying these two criteria. Only 23% and 75% of patients satisfied the 95% age-predicted heart rate (HR) maximum and 180 b min(-1) criteria. Whilst mean ramp and Smax V˙O2peak were not significantly different (1.83±0.78 L min(-1) vs. 1.82±0.67 L min(-1); p=0.88), at the individual level Smax elicited a 'meaningful' (>9%) increase in V˙O2peak (range 9.9-38.3%) compared with V˙O2peak from the ramp test in 3 of 14 cases (21.4%).


Traditional criteria significantly underestimate V˙O2max in young cystic fibrosis patients. Conversely, Smax can confirm when 'true' V˙O2max is achieved. The use of Smax following cardiopulmonary exercise test represents an appropriate method to measure V˙O2max in young cystic fibrosis patients.


Cystic fibrosis; Exercise test; Lungs; Paediatric physician; Physical fitness; Supramaximal verification

[Indexed for MEDLINE]

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