This improves the athlete's ability to perform work, because more oxygen is available to the working muscles.

Promotion to the full performance level is predicated on demonstrated ability to perform work at the higher grade level and the availability of higher graded duties.

Though they lacked the ability to perform work for the Coast Guard and in 1989 they were sold to Spain and replaced with new P-3C aircraft.

Occupational & Environmental Medicine focuses on the health of workers, including the ability to perform work; the physical, chemical, biological, and social environments of the workplace; and the health outcomes of environmental exposures.