Which parameter indicates expiratory muscle strength?

Which parameter indicates expiratory muscle strength?

• A. FEV1
• B. FVC
• C. MEP
• D. Residual volume

Answer: (C)

Expiratory muscle strength is best indicated by maximal expiratory pressure. This measure reflects how strongly the expiratory muscles (primarily the abdominal muscles and internal intercostals) can generate pressure during a forceful exhale. FEV1 and FVC are spirometric values that describe airflow and lung volumes, not the strength of the muscles powering expiration. Residual volume is the amount of air remaining after a full exhale and relates to lung mechanics, not strength. So, the peak expiratory pressure obtained in testing directly captures expiratory muscle strength.

Expiratory muscle strength is best indicated by maximal expiratory pressure. This measure reflects how strongly the expiratory muscles (primarily the abdominal muscles and internal intercostals) can generate pressure during a forceful exhale. FEV1 and FVC are spirometric values that describe airflow and lung volumes, not the strength of the muscles powering expiration. Residual volume is the amount of air remaining after a full exhale and relates to lung mechanics, not strength. So, the peak expiratory pressure obtained in testing directly captures expiratory muscle strength.