.... Oxidants is interesting... and troubling, that would mean anti-oxidants could blunt hypertrophy?
That's precisely the question. What research that has been done thus far points to a possibility, but nothing definitive at this point. A link between oxidative stress and hypertrophy has been mapped for cardiac muscle cells (J. Biol. Chem. 1999, 274, 19323–19328). But the only trial I know of using regular subjects and regular resistance exercise was less informative (free full text -
https://www.ncbi.nlm.nih.gov/pubmed/25384788) The data is much stronger for blunting the beneficial effects of aerobic exercise.
So mechanistically, there is every indication that doses of antioxidants higher than what one would consume in food would have a negative impact on muscle adaptations to resistance training including muscle growth. We need more research before the exact circumstances in which that may or may not occur is clear.
Here is just a list of references looking at free radicals and adaptation to exercise. I have not updated it in a long while but its a good start for those who are interested.
M. Ristow, et al. Antioxidants prevent health-promoting effects of physical exercise in humans PNAS, May 26, 2009; 106(21): 8665 - 8670.
S. K. Powers, et al. Reactive oxygen species are signalling molecules for skeletal muscle adaptation Exp Physiol, January 1, 2010; 95(1): 1 - 9.
Gomez-Cabrera MC, et al. Oral administration of vitamin C decreases muscle mitochondrial biogenesis and hampers training-induced adaptations in endurance performance. Am J Clin Nutr. 2008 Jan;87(1):142-9.
McGinley C, et al. Does antioxidant vitamin supplementation protect against muscle damage? Sports Med. 2009;39(12):1011-32.
Jackson MJ. Free radicals generated by contracting muscle: by-products of metabolism or key regulators of muscle function? Free Radic Biol Med 2008 Jan 15; 44 (2):132-41
Close GL, et al. The emerging role of free radicals in delayed onset muscle soreness and contraction-induced muscle injury. Comp Biochem Physiol A Mol Integr Physiol 2005 Nov; 142 (3): 257-66
Thannickal VJ, Fanburg BL. Reactive oxygen species in cell signaling. Am J Physiol Lung Cell Mol Physiol 2000 Dec; 279 (6): L1005-28
Gomez-Cabrera MC, et al. Moderate exercise is an antioxidant: upregulation of antioxidant genes by training. FreeRadic Biol Med 2008 Jan 15; 44 (2): 126-31
Jackson MJ. Free radicals in skin and muscle: damaging agents or signals for adaptation? Proc Nutr Soc 1999 Aug; 58 (3): 673-6
Ji LL, Gomez-Cabrera MC, Vin˜ a J. Exercise and hormesis: activation of cellular antioxidant signaling pathway. Ann N Y Acad Sci 2006 May; 1067: 425-35
Tiidus, P.M. (1998). Radical species in inflammation and overtraining. Canadian Journal of Pharmacology, 76, 533–538.