Respiratory-Swallow Training in Head and Neck Cancer: Impact on Swallowing Safety and Efficiency

This review article provides a programmatic translational synthesis of a research program investigating respiratory-swallow coordination as a modifiable physiologic target underlying swallowing impairment and safety, with a focus on individuals treated for head and neck cancer (HNC). The purpose is to synthesize physiologic evidence, clinical trial outcomes, and translational advances supporting respiratory-swallow training (RST) as a mechanism-based intervention.

Evidence is drawn from a series of experimental, observational, and interventional studies conducted over more than 3 decades. Methods include synchronized videofluoroscopy and respiratory measurement to characterize respiratory-swallow coordination, clinical trials evaluating RST across chronic and earlier recovery-stage HNC populations, and ongoing work incorporating wearable sensor technology and synchronous telehealth delivery to support ambulatory monitoring and home-based training. Data from Phase I, Phase II, and ongoing randomized efficacy trials are summarized to illustrate mechanistic and clinical effects of RST.

Across studies, swallowing was most safely and efficiently initiated during mid- to low-quiet (tidal) breathing expiratory lung volumes, whereas deviations from this pattern were associated with increased airway invasion and physiologic impairment. RST reliably increased expiratory-phase swallow initiation and was associated with improvements in swallowing impairment, airway protection, bolus clearance, functional oral intake, and patient-reported outcomes. Phases I and IIa trial data demonstrated significant reductions in physiologic impairment scores and penetration-aspiration severity following training.

Collectively, these findings support respiratory-swallow coordination as a modifiable target for dysphagia rehabilitation that results in important physiologic and airway protection advantages. RST represents a mechanism-driven approach that extends beyond compensatory strategies and shows promise for scalable, technology-enabled delivery in both clinical and ambulatory settings. This work has implications for swallowing assessment, intervention, and future research across clinical populations.