Respiratory-swallowing coordination in normal subjects: Lung volume at swallowing initiation.
This study was designed to investigate the significance of bolus types and volumes, delivery methods and swallowing instructions on lung volume at swallowing initiation in normal subjects in a single experiment using a multifactorial approach. Our broad range goal was to determine optimal lung volume range associated with swallowing initiation to provide training targets for dysphagic patients with disordered respiratory-swallow coordination. Our hypothesis was that swallows would be initiated within a limited range of quiet breathing lung volumes regardless of bolus volume, consistency or task. Results confirmed this hypothesis and revealed that swallows were initiated at mean lung volume=244ml. Cued swallows were initiated at lower quiet breathing volumes than un-cued swallows (cued=201ml; un-cued=367ml). Water boluses were initiated at slightly higher quiet breathing volumes than solids. Data suggest that swallows occur within a restricted range of lung volumes with variation due to instructions, bolus type and other experimental variables.
École d'orthophonie et d'audiologie, Faculté de médecine, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, QC H3C 2J7, Canada; School of Communication Sciences and Disorders, Faculty of Medicine, McGill University, 2001 McGill College, 8th floor, Montreal, QC H3A 1G1, Canada. Electronic address: david.mcfarland@umontreal.ca.
D H
DH
McFarland
Medical University of South Carolina, 171 Ashley Ave., Charleston, SC 19425, USA; Ralph H. Johnson VAMC, 109 Bee St., Charleston, SC 29401, USA; Department of Otolaryngology-Head and Neck Surgery, 135 Rutledge Ave., MSC 550, Charleston, SC 29425, USA; Evelyn Trammell Institute for Voice and Swallowing, 135 Rutledge Ave., MSC 550, Charleston, SC 29425, USA; Deparment of Public Health Sciences, 135 Cannon Street, Suite 303, MSC 835, Charleston, SC 29425, USA; The Roxelyn and Richard Pepper Department of Communication Sciences and Disorders, Northwestern University, 70 Arts Circle Drive, Evanston, IL, 60208, USA. Electronic address: bonnie.martinharris@northwestern.edu.
B
B
Martin-Harris
École d'orthophonie et d'audiologie, Faculté de médecine, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, QC H3C 2J7, Canada. Electronic address: annie-joelle.fortin@umontreal.ca.
A-J
AJ
Fortin
Medical University of South Carolina, 171 Ashley Ave., Charleston, SC 19425, USA; Department of Otolaryngology-Head and Neck Surgery, 135 Rutledge Ave., MSC 550, Charleston, SC 29425, USA; Evelyn Trammell Institute for Voice and Swallowing, 135 Rutledge Ave., MSC 550, Charleston, SC 29425, USA. Electronic address: humphrik@musc.edu.
K
K
Humphries
Medical University of South Carolina, 171 Ashley Ave., Charleston, SC 19425, USA; Deparment of Public Health Sciences, 135 Cannon Street, Suite 303, MSC 835, Charleston, SC 29425, USA. Electronic address: hille@musc.edu.
E
E
Hill
Medical University of South Carolina, 171 Ashley Ave., Charleston, SC 19425, USA; Deparment of Public Health Sciences, 135 Cannon Street, Suite 303, MSC 835, Charleston, SC 29425, USA. Electronic address: armeson@musc.edu.
K
K
Armeson
D000328:Adult; D000368:Aged; D003679:Deglutition / Q000502:physiology*; D004576:Electromyography; D005260:Female; D006801:Humans; D008176:Lung Volume Measurements; D008297:Male; D008875:Middle Aged; D010614:Pharynx / Q000502:physiology; D010991:Plethysmography; D012119:Respiration; D015656:Respiratory Mechanics / Q000502:physiology*
Deglutition; Lung volume; Respiration; Respiratory-swallow coordination