Study Shows 30 Minutes Twice Weekly Builds Muscle
New research confirms that just 30 minutes of weightlifting twice a week is enough to trigger measurable muscle growth for people regardless of age or experience level. All study participants saw significant improvements with this minimal routine. The findings reinforce a "quality over quantity" approach to resistance training for busy schedules.
The study, published in *Medicine & Science in Sports & Exercise*, involved 42 adults with previous weightlifting experience who engaged in the routine for eight weeks. Participants performed a single set of 8-10 repetitions for nine different full-body exercises, including squats, chest presses, and lat pull-downs. Interestingly, the research team, co-authored by exercise scientist Brad Schoenfeld, Ph.D., divided participants into two groups. One group lifted to the point of muscular failure, while the other stopped with a few repetitions left in reserve; both groups achieved similar gains in muscle growth and strength. This finding aligns with a larger body of evidence suggesting that training each major muscle group at least twice a week is more effective for muscle growth than once-a-week sessions. The key factor appears to be providing a consistent stimulus for muscle adaptation, which a twice-weekly schedule provides. Further research from Edith Cowan University, led by Professor Ken Nosaka, highlights the efficiency of "eccentric" contractions—the motion of lowering a weight. One study found that focusing only on lowering the weight produced similar strength gains and greater increases in muscle thickness compared to both lifting and lowering, but with half the repetitions.
