For men who regularly train with weights, consuming 4 mg of caffeine per kilogram of body weight through chewing gum has the same effect on strength and power during bench press and squat exercises as taking the same dose in capsule form.

Taking 4 mg of caffeine per kilogram of body weight, whether in gum or pill form, increases the maximum strength and power output during bench press and squat exercises in men who regularly train with weights, compared to taking a placebo.

Chewing gum containing caffeine can improve muscle strength during weightlifting if taken just 5 minutes before exercise, and this effect is similar to taking caffeine in capsule form an hour earlier.

When resistance-trained men consume caffeine through chewing gum instead of capsules, they report less stomach discomfort right after working out and fewer episodes of rapid heartbeat or heart palpitations the next day.

Taking a dose of 6 mg of caffeine per kilogram of body weight has almost no meaningful impact on how much weight a young man who rarely consumes caffeine can lift in a single repetition of bench press or squat, even if the change is statistically detectable.

Taking 6 milligrams of caffeine per kilogram of body weight before a workout can increase the number of repetitions a person can perform to failure during bench press and squat exercises at 70% of their maximum strength, based on measured effect sizes in young men who rarely consume caffeine.