Tolerance of physical load was investigated in 50 convalescents of hemorrhagic fever with renal syndrome (HFRS) at bicycle exercise test (BET). Calculations were made of maximal oxygen consumption and energy consumption at the threshold load. It is shown that for three months after HFRS physical performance of the convalescents remained low. By the end of the expected disability objective recovery of physical performance was registered only in 33-37% convalescents. More than for 3 months disability persisted in reconvalescents engaged in professions with energy consumption above 4.1 kkal/min throughout the working day. Use of BET in the practice of medical labour expertise of HFRS convalescents provides an objective assessment of their working ability and feasible job.