Creatine improved bench-press strength and increased lean mass even without structured exercise in middle-aged adults. Digest
Losing weight can mean losing lean tissue along with fat, an increasing concern as muscle mass and strength tend to decline with age. A clinical trial tested whether creatine could improve that balance, both alongside a training program and without structured exercise.
Researchers recruited 73 adults aged 45–65 for a 12-week trial, with 64 completing the study. Participants first chose whether to join an exercise program, then were randomly assigned within each group to creatine monohydrate (5 grams twice daily) or placebo. Exercisers completed supervised resistance and aerobic training three times weekly while following a diet that aimed to reduce calories by 300–500 per day.
- Among adults exercising and dieting, lean mass increased by 1.27 kilograms (2.80 pounds) with creatine over 12 weeks, compared with 0.14 kg (0.31 lb) with placebo.
- Among adults not participating in the structured exercise and diet program, lean tissue increased by 1.10 kg (2.43 lb) with creatine, versus a 0.16-kg (0.35-lb) decrease with placebo.
- During the exercise and diet program, maximum leg-press strength increased more with creatine than placebo: 54.82 kg (120.86 lb) versus 25.85 kg (56.99 lb).
- Among adults not participating in the structured exercise and diet program, maximum bench-press strength increased by 4.02 kg (8.86 lb) with creatine, compared with a 2.96-kg (6.53-lb) decline with placebo.
- During the exercise and diet program, body-fat percentage fell significantly more with creatine than placebo: 3.24 versus 1.87 percentage points.
Creatine increases muscle stores of phosphocreatine, which rapidly replenishes energy during forceful contractions. That extra reserve could improve lifting performance even without structured training and, with regular exercise, help muscles sustain the work that drives adaptation. This may become increasingly relevant with age, as muscle mass and strength decline and weight loss can further reduce lean tissue. Creatine can also increase body water, so some of the increase in lean tissue may reflect changes in hydration rather than muscle growth.
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Creatine is not a substitute for exercise, but it may still help both alongside training and without a structured exercise program. Benefits that do not depend on structured training become increasingly relevant with age, when illness or limited mobility may make exercise harder to maintain.