The aim of this study is to determine respiratory-metabolic characteristic of the Croatian rowers and a connection of these features with the success in rowing ergometer. The study was conducted on a sample of 180 Croatian rowers (82 juniors, 98 seniors), among which 109 representatives. Tests were conducted in the diagnostic centre of the Faculty of Kinesiology in Zagreb and in the respiratory department of the lung department, Clinical hospital centre Split. The same discontinuous method load was applied in both centres. The multivariate analysis of variance was used to show different results between the rowers of different ages (juniors / seniors) and those with different performance. Correlation of respiratory and metabolic properties, with success in rowing, was established using the regression analysis. Respiratory and metabolic characteristics were treated as predictor and the work done on the treadmill as a criterion variable. After the completion of the exercise done on the rowing ergometer, a significant association between respiratory and metabolic characteristics, with success in rowing, was established. The set of variables measured in Split, explains half of the variability in sport performance excellency on the rowing ergometer. The set of variables measured in Zagreb, explains 63% of the variability in the criterion variables measured in juniors and 39% of the variability in the criterion variables measured in seniors. Rowing team, in both age groups, achieves significantly better results on the rowing ergometer which can be associated to the higher body height and higher body mass. These parameters indicate increased respiratory parameters and the maximum oxygen consumption. Presented in the relation to the prediction, that is, in the relatively maximum oxygen consumption, these data indicate no difference among rowers of different ages. The specifics of motor learning when performing complex rowing stroke movements should offer the explanation for better results. The conclusion, based on these results, is that one should start with the systematic diagnosis in rowing at the latest in the year preceding the juniors - Junior B (16-years-old).