K.A. Barnes: Salary; PepsiCo, Inc. Ownership Interest (stocks, stock options, or other ownership interest excluding diversified mutal funds). Please specify in the field specific ownership interests, (i.e. own the company, own stocks, future stock options); PepsiCo, Inc. Other (please describe); This study was funded by the Gatorade Sports Science Institute, a division of PepsiCo, Inc. The views herein are those of the authors and do not necessarily reflect the position or policy of PepsiCo..