i read once that muscle growth begins 24 hours after a muscle is trained-peaks at 48 and ends by 96.i think it was in a Hatfield book.ive always trained on a nine day cycle because i felt it maximized gains and kept most muscle groups in a constant state of growth.(eg..id train biceps three days after back because they were worked indirectly on back day)does anyone know if this scale is still considered valid or have they're been newer studies??