sustained

Kept up or maintained uniformly, as at one pitch or level, especially a high pitch, or at the same degree, especially a high degree.

In heraldry, same as supported: see also surmounted.

Held up to a certain pitch, degree, or level; uniform.

Simple past tense and past participle of sustain.

held continuously at a certain level

held at a certain pitch

maintained at length without interruption or weakening

(of an electric arc) continuous