负荷，是不是就是“效率”的意思？

Dyspnoea can be treated by various techniques (page 320) and attempts made to alleviate patients’ perception of their breathlessness by teaching them specific techniques to control their breathing. Pulmonary rehabilitation (page 333) or noninvasive ventilation (see later discussion) are two techniques that can increase respiratory muscle efficiency or workload, respectively.

可通过各项技术治疗呼吸困难（第320页），并尝试通过指导患者控制呼吸的特定技巧来缓解患者对其呼吸急促的感觉。肺康复（第333页）或无创通气（见后面的讨论）是两种分别提高呼吸肌效率或做功负荷的技术。

这里的负荷，是不是就是“效率”的意思？