For best results using the S&H series, work each body part once or twice per week, and you can certainly do these on consecutive days, i.e. chest and back on Monday, Shoulders, Tris and Bis on Tuesday, but do not work the same muscle two days in a row.
If you want to include some endurance work during the same week, then only do the S&H once each week, put 2 or 3 days of cardio in between, then schedule your total body endurance type wweight lifting routine.
Rest makes the muscles gain strength and size.
I found I reduced the amount of cardio I did during a S&H rotation without thinking about it consciously simpy because the S&H way of lifting takes longer and so I didn't have 3 hours per day to dedicate to lifting and cardio each day. I would say 3 cardios per week during a S&H rotation is optimal and will not interfere with muscle mass and strength gains.
Clare