Rib cage contributions to inspiratory capacity in patients with cervical spinal cord injury

Ryo Yoshida; Kenta Kawamura; Yukako Setaka; Hyunjae Woo; Nobuhisa Ishii; Masafumi Mizukami; Hirotaka Mutsuzaki; Kazuhide Tomita

doi:10.1016/j.crphys.2024.100127

Rib cage contributions to inspiratory capacity in patients with cervical spinal cord injury

Curr Res Physiol. 2024 May 17:7:100127. doi: 10.1016/j.crphys.2024.100127. eCollection 2024.

Authors

Ryo Yoshida¹, Kenta Kawamura², Yukako Setaka¹, Hyunjae Woo², Nobuhisa Ishii³, Masafumi Mizukami¹, Hirotaka Mutsuzaki¹, Kazuhide Tomita¹

Affiliations

¹ Graduate School of Health Science, Ibaraki Prefectural University of Health Sciences, Japan.
² Department of Physical Therapy, Ibaraki Prefectural University of Health Sciences, Ibaraki, Japan.
³ Ibaraki Prefectural Central Hospital, Ibaraki, Japan.

Abstract

Background: Cervical spinal cord injury (CSI) often leads to impaired respiratory function, affecting the overall well-being of patients. This study aimed to investigate the influence of rib cage motion on inspiratory capacity in CSI patients.

Methods: We conducted a study with 11 CSI patients, utilising respiratory inductance plethysmography (RIP). We measured ventilatory volume by spirometry concurrently with RIP. Participants were instructed to perform maximal inspiratory efforts. Inspiratory capacity (IC) was calculated from spirometry waveforms. We converted the respiratory waveforms of the chest and abdomen into inspiratory volume measured by a spirometer. The inspiratory volume measured by the chest sensor was defined as V_{RIP-rib cage} (V_RIP-rc), and the inspiratory volume measured by the abdominal sensor was defined as V_RIP-abdomen (V_RIP-ab). Subsequently, the relationships of IC with V_RIP-rc and V_RIPab were assessed.

Results: The mean IC was 1.828 ± 0.459 L, with the mean V_RIP-rc at 1.343 ± 0.568 L and the mean V_RIP-ab at 0.485 ± 0.427 L. A significant correlation was observed between IC and V_RIP-rc (r = 0.67, p = 0.02), indicating that rib cage motion significantly influences IC in CSI patients.

Conclusion: This study highlights the importance of rib cage motion in assessing inspiratory capacity in patients with CSI.

Keywords: Cervical spinal cord injury; Inspiratory capacity; Respiratory inductance plethysmography; Rib cage motion.