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Gillyanne & Jeremy tackle two controversial AMAs in this episode:
What they REALLY think about "thick and thin folds", and why the topic of vocal fold hydration is so confusing.

Gillyanne and Jeremy go in depth into vocal fold behaviour, why the terms thick and thin are misleading, how we can change pitch and volume while singing, and which words they now use in their teaching.
And in answer to four people's questions on hydration, Jeremy shares some of the research findings on hydration (systemic and topical), why the answer to "how long does it take to hydrate" isn't as straightforward as it sounds, the different types of dehydration, and why you can drink too much water.

Mentioned in the show:

My supporting article on hydration and the vocal folds is here:
https://vocalprocess.co.uk/hydration-vocal-folds/

The Voice Clinic Handbook (2nd edition, Harris et al) https://amzn.to/3ch17HN

Verdolini-Abbott et al papers
https://pubmed.ncbi.nlm.nih.gov/7823546/ Dependence of phonatory effort on hydration level
https://pubmed.ncbi.nlm.nih.gov/12003510/ Biological mechanisms underlying voice changes due to dehydration

Sivasankar & Leydon The Role of Hydration in vocal fold physiology 2010 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2925668/ 
 

Hartley & Thibeault Systemic hydration: relating science to clinical practice in vocal health 2014 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4157110/

Leydon, Wroblewski, Eichorn & Sivasankar A meta-analysis of outcomes of hydration intervention on phonation threshold pressure 2010 https://www.jvoice.org/article/S0892-1997(09)00074-5/fulltext

Marshall et al Systemic but not local rehydration restores dehydration-induced changes in pulmonary function in healthy adults https://journals.physiology.org/doi/full/10.1152/japplphysiol.00311.2020

Hydration video tutorial from the European Federation of the Association of Dieticians http://www.efad.org/en-us/euhhac-hydration-resource-center/tutorial-on-hydration/

US National Athletic Trainers’ Association Position Statement “Fluid Replacement for the Physically Active” https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5634236/ 

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