Re: Effects of Caffeine on Heart Rate Variability in Boys by Turley et al. ( J Caffeine Res 2017;7:71–77 )

Turley KR , Rivas JD , Townsend JR , Morton AB . Effects of caffeine on heart rate variability in boys. J Caffeine Res. 2017; 7:71–77.

Temple JL , Ziegler AM , Graczyk A , Bendlin A , Sion T , Vattana K . Cardiovascular responses to caffeine by gender and pubertal stage. Pediatrics. DOI: 10.1542/peds. 2013–3962

Temple JL , Ziegler AM . Gender differences in subjective and physiological responses to caffeine and the role of steroid hormones. J Caffeine Res. 2011; 1:41–48.

Temple JL , Dewey AM , Briatico LN . Effects of acute caffeine administration on adolescents. Exp Clin Psychopharmacol. 2010; 18:510–520.

Website maintained by the University of Washington, Seattle, Washington at: https://faculty.washington.edu/chudler/caff.html; the webpage citing caffeine amounts in foodstuffs and medicines includes: Pennington J.A.T. , Food Values of Portions Commonly Used (18th Edition), J.B. Lippincott, Philadelphia, 2005; Soft Drink Manufacturers Association; United States Department of Agriculture, Human Nutrition Information Service, Handbook #8–14 (1986) and Handbook #8–19 (1991); Starbuck Co. Information Pamphlet, American Beverage Association. (accessed June 12, 2017).

Evans SM , Griffiths RR . Caffeine tolerance and choice in humans. Psychopharmacology (Berl). 1992; 108:51–59.

Chawla J , Lorenzo N . Neurologic effects of caffeine, April 12, 2017, published on Medscape, for more information: www.medscape.com/public/permissions (accessed June 12, 2017).