Does lung volume size affect respiratory rate and utterance duration?

This study explored whether lung volume size affects respiratory rate and utterance duration. The lung capacity of four women and four men was estimated with a digital spirometer. These subjects subsequently read a nonsense text aloud while their respiratory movements were registered with a Respiratory Inductance Plethysmography (RIP) system. Utterance durations were measured from the speech recordings, and respiratory cycle durations and respiratory rates were measured from the RIP recordings. This experiment did not show any relationship between lung volume size and respiratory rate or utterance duration