22 male volunteers ( SS : n = 11 , 65.6 3.4 years ; SL : n = 11 , 70.3 4.9 years ) were assigned to one of two strength RT groups , following 4 weeks of periodized hypertrophic RT ( PHRT ) : strength RT with 60-s RI ( SS ) or strength RT with 4-min RI ( SL ) .