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[Exercise-related risk at anaerobic threshold in patients with chronic obstructive pulmonary disease]
1Beijing Friendship Hospital, Capital University of Medical Science, Beijing 100050, China.
Objective:
To investigate the exercise-related risk at anaerobic threshold(AT) in patients with chronic obstructive pulmonary disease(COPD).
Methods:
Sixty two patients [men 56, women 6, aged (66±8) yr] with stable COPD in Beijing Friendship Hospital during 2013-2014, participated in this study. Incremental symptom-limited cardiopulmonary exercise test was performed on cycle ergometer. The AT was determined using the V-Slope technique and ventilatory equivalents for carbon dioxide and oxygen. Symptoms, 10-lead electrocardiogram, oxygen saturation by pulse oximetry(SpO(2)) were monitored during exercise.
Results:
The AT, detectable in 53 patients, occurred at (68±10)% of peak oxygen uptake(peak VO(2)). The SpO(2) was in the safe range (94±2) % and the respiratory reserve was relatively high at AT (i.e. 48%).
Conclusions:
High-intensity exercise training can be performed in patients with moderate-to- severe COPD without resting oxygen desaturation.
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