Nutrition and Hydration Extremes Research

Overview

Nutrition

The Extremes Research Group have conducted several studies investigating the effect of nutrition on exercise performance, hydration, thermoregulation and immune status. This work has allowed for better understanding of how nutritional deficiencies compromise the immune system and exercise capacity.  Most recently Prof Walsh and Dr Fortes have shown that the provision of a daily mixed nutritional supplement can protect against the deleterious effects of arduous military training on soldiers immune health and physical performance.

Selected Publications (click on titles below to read the study summary):

Diment BC, Fortes MB, Greeves J, Casey A, Costa RJS, Walters R, and Walsh NP (2012). Effect of daily mixed nutritional supplementation on immune indices in soldiers undertaking an 8-week arduous training programme.  European Journal of Applied Physiology, 112, 1411-1418.

Costa RJS, Fortes MB, Richardson K, Bilzon JLJ and Walsh NP (2012). The effects of post-exercise feeding on saliva anti-microbial proteins. International Journal of Sports Nutrition and Exercise Metabolism, 22, 184-191.

Fortes MB, Diment BC, Greeves JP, Casey A, Izard R and Walsh NP (2011).  Effect of a daily mixed nutritional supplement on physical performance, body composition and circulating anabolic hormones during 8-weeks of arduous military training.  Applied Physiology, Nutrition, and Metabolism, 36, 967-975.

Hydration

Prof Walsh and Dr Oliver have conducted several studies investigating the potential of novel biomarkers to monitor hydration status and promote good hydration. Building on early research by the ERG that showed saliva osmolality as a potential marker of whole body hydration status, Prof Walsh has also showed that a tiny amount of tear fluid can also provide an estimate of an individual’s hydration status. This research also highlighted, for the first time, that hydration status may be an important consideration in the aetiology of dry-eye disease. Research conducted within the Extremes Research Group has also identified that modest dehydration, of the magnitude often experienced by athletes undergoing heavy training, may suppress aspects of mucosal immunity. More recently, Prof Walsh and Dr Oliver, collaborated with Loughborough and Stirling Universities, to validate the beverage hydration index. This index may better inform people when choosing drinks to maintain good hydration status.

Selected Publications (click on titles below to read the study summary):

Maughan RJ, Watson P, Cordery P, Walsh NP, Oliver SJ, Dolci A, Rodriguez Sanchez N, Galloway SDR (2018). Sucrose and sodium but not caffeine content influence the retention of beverages in humans under euhydrated conditions. International Journal of Sport Nutrition and Exercise Metabolism.

Maughan RJ, Watson P,Cordery PAA, Walsh NP, Oliver SJ, Dolci A, Rodriguez-Sanchez N, and Galloway SDR (2015). A randomized trial to assess the potential of different beverages to affect hydration status: development of a beverage hydration index. doi: 10.3945/ajcn.115.114769

Oliver S, Walsh N, Maughan RJ, Watson P, Cordery PA, Dolci A, Rodriquez Sanchez N, and Galloway SD, (2015). Development of a hydration index: a randomized trial to assess the potential of different beverages to affect hydration status. Nutricion Hospitalaria, 32(s02), 10264

Fortes MB, Owen JA, Raymond-Barker PC, Bishop C, Elgenzai S, Oliver SJ, Walsh NP, (2015). Is this elderly patient dehydrated? Diagnostic accuracy of hydration assessment using physical signs, urine and saliva markers. Journal of the American Medicial Directors Association, 16(3). 221-228.

Owen JA, Kehoe SJ, and Oliver SJ, (2013). Influence of fluid intake on soccer performance in a temperate environment. Journal of Sport Sciences, 31 (1), 1-10.

Walsh NP, Fortes, MB, Raymond-Barker P, Bishop C, Owen J, Esmaeelpour, M, Purslow C, and Elghenzai S (2012). Is whole body hydration an important consideration in dry eye? Investigative Ophthalmology & Visual Science, 53, 6622-6627.

Fortes MB, Diment BC, Di Felice U, and Walsh NP (2012). Dehydration decreases saliva anti-microbial proteins important for mucosal immunity.  Applied Physiology, Nutrition, and Metabolism, 37, 850-859.

Fortes MB, Diment BC, Di Felice U, Gunn AE, Kendall JL, Esmaeelpour M, and Walsh NP (2011). Tear fluid osmolarity as a potential measure of hydration status. Medicine and Science in Sports and Exercise, 43, 1590-1597.