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The Nutritional Challenges in Dysphagia: Not Only a Matter of Nutrients DOI: http://dx.doi.org/10.5772/ TexLi.105167I
. Mouthfeel and texture perception
Ingestion of food is also guided by mouthfeel and texture perceptions as well as appreciation of the masticated bolus. Oral processing is a complex progression of neuromuscular interactions which prepares and assess food prior to swallowing. As food is being broken down and imbibed with saliva, it is in contact with the oral sensory receptors and an integrated sensory evaluation of tastes, volatile com­pounds and texture will occur [141 142, ].
Electromyography (EMG) has been used to assess electric activity of the main masticatory muscles in healthy participants. Coupled to chewing cycle counts, tongue mobility, tongue pressure, salivation or videofluoroscopy studies, the mechanistic involved pre- and peri-swallowing can be assessed [143 148– ]. In a study looking at gels and sols, muscle activity required until swallowing appeared to be well correlated with the required force deployed for large compression deforma­tion which occurs at the initiation of mastication [ ]. Tournier and colleagues 145 observed large inter-participant variation both for salivation and oral processing after 5 healthy participants masticated 4 breads of different textures and composi­tions [ ]. Mori and colleagues studied the laterality of the posterior tongue move-146 ment in 20 young and health adults by [147]. Gummy jelly, sponge cake and mashed potatoes were assessed as representative of gradient mastication intensity require­ments at the initiation, middle and end of mastication stages. For the purpose of the study, the participants were asked to masticate only on the right side or only on the left side. They measured a more intense EMG activity on the side of mastication for the gummy jelly and documented that tongue activity was affected by the food texture. Finally, Matsuo and colleagues investigated the masticatory function of 22 young participants an 32 community-dwelling older individuals of either normal or oral hypofunction. For their investigation, the test samples were a control meatloaf, meatloaf containing lotus root, control chicken ball or chicken ball with almonds slivers (10g per bite). The documented mean EMG amplitudes and integrated EMG activity were lower for control samples which were softer test foods. Oral functions, including dental condition, appeared to decline with age and would have influenced the assessed mastication capacity [148].
The characterization of the biomechanics of bolus preparation and its impact on swallowing capacity is still being investigated [ – ] and remains limited in 149 151 application for daily clinical investigations or association to diversified menu items around the globe. Few foods have been assessed. However, the variability in bolus process are highlighted and the impact could be important.
Individual physiognomy, quality of dentition and capacity to prepare foods for deglutition are only one part of the complex equation. The foods and liquids consumed bring their share of complexity. The lubrication of the bolus is also dependent on salivation. Intra-oral assessment of bolus texture and correlation to sensory perceptions are challenging.
. Development of adapted texture-modified foods
. Sensory evaluation
Acceptance by consumers of food products is a main priority for the food industry. Development of new products is time consuming and costly. However, the formal study of sensory evaluation of foods is a science with a relatively recent history. As stated by M.A. Drake, sensory evaluation is a “collection of techniques that seek to differentiate between a range of products based on all of their sensory
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characteristics and to determine a quantitative description of all the sensory attri­butes that can be identified, not just the defects” [152]. Methods such as discrimina­tion testing (Is there a difference between 2 formulations?), acceptability (Which food would you prefer? Rating scales of relative dislike and like), descriptive sensory evaluation (How can we discriminate between a range of products based on all of their sensory characteristics?) have provided additional tools for application in research, product development, and marketing [152, ]. Important develop-153 ments in the science of sensory evaluation were initially triggered in the U.S. by the desire to optimize food intake in U.S. armed forces [152, –156]. With the cre-154 ation of the food acceptance program in 1945, the U.S. Army Quartermaster Food and Container Institute (Chicago) had four main divisions which were food habit studies, psycho-physiological studies, organoleptic studies and statistical theory. In 1949 and 1950, psychologists David Peryam and Norman Girardot were hired to lead the Food Acceptance Research Branch. As measurement is essential to building comparative datasets, the staple nine-point hedonic scale (Table ) was developed to assess food acceptance and preference [157, ]. This scale remains in use today 158 to asses customers appreciation of assorted food products such as chips [ ], beef 159 sausage using pigeon pea as binding agent [160] or yoghurt [161].
In the past, food development for the treatment of dysphagia customarily stemmed from clinical settings [44, 72, ]. Researchers state that TMF and TF are 162 deemed to be at the core of the nutritional treatment for dysphagia diets [ , ], 65 163 therefore, it is essential to evaluate the sensory profile if optimal ingestion is to be achieved. Limited publications have assessed sensory characteristics of TMF or TF. Pureed peaches [ ], pureed carrots [164 165 167– ], meats [ , ], soups, pates and 166 167 timbales [ ] were assessed primarily by healthy young adult for sensory percep-167 tion. Thickened fluids have been studied more extensively: water with and without barium, lemon flavored water, juices, milk and infant formula [63, , ]. But, 168 169 even fewer publications have included participants with impaired swallowing [164 166, ]. Studies are mainly conducted with the participation of young healthy adults. To be fair, several neurological diseases affect oral expression or comprehen­sion of instructions which could render consumer assessments difficult. However, when recommending approaches to improve nutritional intakes and adherence to a proposed dysphagia diet, customer appreciation—likes and aversions of patients—should be at the core of the plan. More sensory research should be done with TMF and TF to help in developing complete, nutritious, appetizing and varied menu plans.
. Rheological evaluation
Nutritional interventions for the treatment of dysphagia can take various forms and should progress with the medical conditions. Foods are molecularly and
Like extremely
Like very much
Like moderately
Like slightly
Neither like nor dislike
Dislike slightly
Dislike moderately
Dislike very much
Dislike extremely
Table 3. 9-point hedonic scale [157].
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The Nutritional Challenges in Dysphagia: Not Only a Matter of Nutrients DOI: http://dx.doi.org/10.5772/ TexLi.105167I
structurally elaborate and diverse. Oral nutritional supplements, texture-modified foods and thickened fluids often require the addition of the texture modifying agents which only adds to the complexity of these matrices. Comparing foods items is challenging in clinical trials. Over time, terminology and assessment methods have been proposed [170]. Two major milestones in the evolution of dysphagia diets development were the National Dysphagia Diet (NDD) [ ] in 1999 and the 171 International Dysphagia Diet Standardization Initiative (IDDSI) [39] in 2015.
Based on the work of food scientists Russell H. Mills [172] and Don Tymchuck [173], the NDD was the first diet to propose a quantifiable measure to assess flow of TF. Viscosity ranges were determine to discern different 3 different levels of consistency for fluids. Concepts of food texture such as adhesiveness, cohesiveness, firmness and springiness were also suggested to describe and classify TMF in 3 categories (Table ).
After an extensive literature review and consultation among researchers, clini­cians and industry leaders, the IDDSI group propose a more extensive descriptive framework and classification of the liquids with 5 levels to distinguish fluids and 5 levels for the MTF. A gravity flow test using a syringe is propose to measure liquid flow and 4 levels are recommended ( ). The syringe was preferred to other Table  methods such as shear viscosity measurements or the use of empirical tests such as the Bostwick consistometer [174] or the line spread test due to the accessibility and ease of use of the syringe. But, velocity results obtained for various fluids using the IDDSI syringe and the Bostwick consistometer are unexpected and the discriminat­ing capacity of the IDDSI levels remain to be demonstrated (Figure ). The food texture descriptive parameters are still suggested to explain the MTF. However, other guidelines such as particle size, spoon-tilt test, drip test, fork pressure test and visual cues were added.
Both frameworks had important repercussions in the research and industrial arenas. By proposing a standardized terminology and food classification systems, these approaches helped researchers, clinicians, patients as well as the food industry to classify foods and allow better description of clinical protocols and comparison
NDD
—terminology IDDSI—terminology
Fluids units Drinks units
(ml after 10s)
Thin
Nectar-like
Honey-like
Spoon-thick
1–50 cP
3
50–350cP 351– 1750cP ≥1750cP
Thin—level—0 Slightly thick—level—1 Mildly thick—level—2 Moderately thick—level—3 Extremely thick—level—4
≤1ml 1–4ml 4–8ml 8–10ml ≥10ml
Foods Foods
NDD level 1: dysphagia-pureed Liquidized—level—3 8–10ml
NDD level 2: dysphagia-
mechanical altered
Pureed—level—4 10ml≥
NDD level 3:
dysphagia-advanced
Minced & moist—level—5 Transitional foods
Regular Soft & bite-sized—level—6
Easy to chew-regular—level—7
National dysphagia diet.
International dysphagia diet standardization initiative.
centiPoise.
Table 4. Terminology and rheological parameters associated to various levels of dysphagia diets.
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of interventions. Still, clinical trials will be required to assess their impact on nutritional status of patients suffering from dysphagia. The main novelty of these proposed frameworks was the use of rheology.
Rheology is the science of deformation and flow of matter [ ]. In the context 175 of oropharyngeal dysphagia, fluids and semi-solid foods are the object of interest. Two (2) extensive reviews helped the understanding of the science of rheology specifically in the perspective of oropharyngeal dysphagia treatment [176, ].177
First, the review published by Gallegos et al. [176] focused on the rheology of fluids. Providing a short review of basic rheological concepts, they present funda­mental parameters impacting the flow of fluids such as stress, strain and strain rate (Table ), type of fluids Newtonian, non-Newtonian, viscoplastic fluids as well as time-dependent viscous flow behavior, shear viscosity and extensional viscosity. In light of their work, it becomes evident that a bolus will undergo major pressure and deformation before and during the course of deglutition. The various forces applied (i.e. shear rates) throughout swallowing are challenging to measure and have not been clearly established. For the moment, a shear rate of 50s−1 is generally used in the
Figure 4. Bostwick flow test and syringe flow test of common products (AAFC—Saint-Hyacinthe Research and Development Center (Canada)—unpublished data).
Variable Description Units
Stress (τ or σ) Force per unit area Pascals (Pa)
Strain ( Relative variation of position in the flow direction Non dimensionalϒ)
Strain rate (‘ Strain variation over timeϒ) s
−1
These variables are temperature, pH, pressure and time dependent in Non-Newtonian fluids. Swallowing imposes a stress on the bolus and deformation of the fluid occurs. The composition of the bolus will influenced its rheological behavior.
Table 5. Fundamental dynamic and kinematic variables of flow [ ].176
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The Nutritional Challenges in Dysphagia: Not Only a Matter of Nutrients DOI: http://dx.doi.org/10.5772/ TexLi.105167I
literature. Salivary alpha-amylase and the presence of contrast fluids (barium) are also addressed since their presence impacts the bolus texture parameters and rheo­logical behavior as the bolus is being processed orally prior or during swallowing.
Raheem and colleagues proposed a comprehensive review of the publications addressing the TMF. They present the various tests, both sensory and instrumental, available to the food industry to measure textural characteristics of foods. Similarly to the work done with TF, the rheological assessment of TMF is scare in the litera­ture. According to this review, a better understanding of the complex food matrices used in the nutritional treatment of dysphagia, by all stakeholders, must take place to improve TMF.
. Bridging the gaps
As early as 1963, Dr. Alina Szczesniak [ , ] led the food industry in bridg-178 179 ing the gap between the emerging technologies of the times and the sensory evalu­ations of foods. By developing standard rating scale to describe the mechanical characteristics of foods that were now assessed by texturemeters, Dr. Szczesniak demonstrated that although more repeatable and quantifiable, the data obtained for instruments remained insignificant in product development if they were not linked to human assessment and ratings. This vision of correlating instrumental and sensory assessments should inspire more future research in nutritional treatment for dysphagia. The recent ‘mouthfeel wheel’ terminology should be a step in the right direction [ ].180
. Conclusion
Dysphagia is a condition affecting dietary intake. Although often underesti­mated, chronic undernutrition can exacerbate frailty and can lead to poor physical condition, declined immune system, sarcopenia and pneumonia. In view of the cur­rent literature, nutritional content, texture and consistency as well as appearance of texture-modified foods should be improved. An assortment of foods and fluids should be investigated to reflect more realistic food intake patterns. Above all, a personalized nutritional intervention is essential to prevent health decline.
Eating is indispensable to subsistence in addition to being a critical part of the social aspect of life. New texture-modified foods should be developed with the involvement of individuals affected by dysphagia to improve taste, textural profiles and overall acceptability. Clinical trials should improve documentation of the dysphagia severity level, nutritional intervention (foods/fluids offered) and food intake prescribed, nutrient density, satisfaction of meals and adaptation to patients nutritional needs. Research done to date, although essential to understanding this complex health issue, is still theoretical and lacks integration of expertise. We must improve clients/patients consultation. A large number of foods and fluids are required to build an nutritious and appealing menu which is an essential element to improve intakes. An open-sourced international clinical database for nutritional interventions in dysphagia, similar to existing food composition databases [181 184– ], would be a valuable tool to build a strong resource base. While archiving details of various food or fluids formulations, nutritional values and rheological parameters (when available), this compendium would support knowledge transfer and benefit food/pharmaceutical industries, researchers, clinicians as well as clients.
Finally, clinicians and research teams must continue to progress in bridging the knowledge gap between the foods used to evaluate dysphagia severity (with and without barium), the foods and the fluids available for nutritional interventions
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Notes/thanks/other declarations
The author is co-inventor of the CA2467625C patent. The current assignee of this patent is Her Majesty the Queen in Right of Canada.
156
and recommendations for the development of commercial foods available for oropharyngeal dysphagia treatment.
Acknowledgements
First, I wish to thank Sophie Turcot for her support in organizing and maintain­ing our laboratory facilities as well as her reliability and diligence in her scientific work. I wish to acknowledge Francis Villeneuve for his methodical approach in the multiple rheological tests conducted. Finally, I wish to extend my most sin­cere gratitude to Amélie Giroux, Patricia Décarie and Vivianne Chagnon of the Association professionnelle des nutritionnistes experts en dysphagie for their patient­centered approach to clinical nutrition.
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The Nutritional Challenges in Dysphagia: Not Only a Matter of Nutrients DOI: http://dx.doi.org/10.5772/ TexLi.105167I
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