The 1500-m TT was unaffected by acute or chronic BR supplementation ( acute PL , 4:10.4 min : s 2.5 s ; chronic PL , 4:11.4 min : s 2.7 s ; acute BR , 4:10.7 min : s 1.5 s ; chronic BR , 4:10.5 min : s 2.2 s ) .