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Killer, S.C., Svendson, I.S., and Gleeson, M. (2015). The influence of hydration status during prolonged endurance exercise on salivary antimicrobial proteins. European Journal of Applied Physiology, 115, 1887-1895. The secretion of mucus is the initial biological defense system against bacteria and other pathogens in the mouth and respiratory system (Gleeson and Pyne, 2000 as cited in Killer, Svendson, and Gleeson, 2015). Salivary secretory IgA (SIgA) in a deficit has been shown to be associated with high frequency of illness (Kiler, Svendson, and Gleeson, 2015). Despite this association, research has recently taken a turn towards analyzing antimicrobial proteins (AMPs) and has continued to gain momentum. There are two very prevalent AMPs in the mucus, salivary lysozyme (SLys) and salivary lactoferrin (SLac), both of which have an important presence in protecting the immune system. This is an important note regarding athletes, as training involves longer and more intense bouts of exercise …show more content…
This most interesting part of the study by Yamashita and colleagues (2015) were the conclusions they reached and the parameters that they used to establish a state of hypohydration. Starting with the parameters of hypohydration, I found it very interesting that they only used a threshold of 2.25%. The participants were very experienced with water-deficit, as they were boxers who have had to make weight class standards for a good portion of their lives. This level of experience and high training level, to me, made them excellent candidates to dehydrate them significantly more than Yamashita and colleagues (2015) chose to. This percentage chosen, 2.25%, is only slightly higher than some previous studies discussed that used values just below 2% and also saw no changes in performance, so I would have thought that the current research team would want a more substantial change in hydration status across

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