Background: Prevention of cardiac events during competitive sports is fundamental. New technologies with remote monitoring systems integrated into clothing could facilitate the screening of heart disease. Our aim was to evaluate the feasibility of Nuubo sys-tem during a field stress test performed by soccer players, compar-ing results with treadmill ergospirometry as test reference. Methods: Nineteen male professional soccer players (19.2 ± 1.6 years) were studied. Wireless electrocardiographic monitoring dur-ing a Yo-Yo intermittent recovery test level 1 in soccer field and subsequent analysis of arrhythmias were firstly performed. Subse-quently, in a period no longer than 4 weeks, each player underwent cardiopulmonary exercise testing in hospital. Results: During Yo-Yo test, electrocardiogram (ECG) signal was interpretable in 16 players (84.2%). In the other three players, ECG artifacts did not allow a proper analysis. Estimation of maxi-mum oxygen consumption was comparable between two exercise tests (VO 2 max 53.3 ± 2.4 vs. 53.7 ± 3.0 mL/kg/min for Yo-Yo test and ergometry respectively; intra-class correlation coefficient 0.84 (0.63 -0.93), P < 0.001). No arrhythmias were detected in any player during both tests. Conclusions: The use of Nuubo's technology allows an accurate single-lead electrocardiographic recording and estimation of reli-able performance variables during exercise testing in field, and pro-vides a new perspective to cardiac remote monitoring in collective sports.