He said players are susceptible to injury when they test high hydration levels.I read this a bit ago and it was interesting. I think a lot of things Chip is applying make a ton of sense, especially the fast paced practices and the advanced training techniques.
Interestingly, DeMarco Murray sat out the first day of camp because he wasn't properly hydrated when tested that morning. I have no idea what the effects of hydration are on injury chances or recovery time and what not but it goes to show that Chip takes the questionnaires and tests very seriously.
Quick google search pulls this up
Beginning a practice or competition in a severely hypohydrated state will negatively affect performance. Dehydration influences several aspects of exercise in a negative way. Rises in core temperature, early fatigue, and decreased performance are some factors that are present in a dehydrated athlete. Understanding the signs and symptoms of dehydration and managing it early will stop any further injury or illness to the athlete. Certified Athletic Trainers must promote hydration before exercise but must also be knowledgeable of the signs and symptoms of dehydration in the event that it occurs. Although water is the primary method of rehydration, sports drinks can be incorporated before, during, and after exercise in order to maintain fluid balance. Proper hydration during exercise is known to have benefits that aid in athletic performance. Overall hydration is beneficial not only to exercise and athletic performance but also physiologic functions.
http://www.kon.org/urc/v10/athletic-training/decker.html