Abstract: ObjectiveThe current world rowing training highlights the quality of high intensity training. However, this highlight depends firstly on the knowledge of energy contributions in this kind of training. The aim of this study was to investigate the energy contributions of ergometric rowing time trial with different durations.Methods11 (5 females, 6 males) trained provincial rowers volunteered to preform 5 time trials on rowing ergometer with different durations (45 s, 90 s, 3.5 min, 5 min, and 6.5 min) . Portable spirometric system was utilized to measure the ventilatory information during the test. Earlobe blood was taken and analyzed prior to and post the test.The energy contribution was calculated with the method based on fast component of oxygen debt, accumulated blood lactate and oxygen uptake during test.ResultsThe energy contribution from anaerobic alactic, anaerobic lactic, and aerobic system in the five time trails were 约 30~50k J, 约 32~58k J, and 约 26~433k J. The relative aerobic energy contributions were 28.6%±11.4%, 47.0% ± 10.7%, 71.6% ± 5.5%, 81.0% ± 4.2%, and 83.2% ± 3.1%, correspondingly.ConclusionThe profile of energy contributions in different ergometric rowing time trials varies, with higher demand of energy supply in longer time trials, which is predominantly met by aerobic energy system.