After a single workout with weights, your muscles temporarily slow down their protein-building process, and this might be because a specific energy-sensing molecule (AMPK) gets more active and tells the building machinery to take a break.

Even though your muscles get a signal to slow down energy use after lifting weights, they still keep building protein—like your body’s repair crew is ignoring the ‘slow down’ sign because the ‘build up’ signal is stronger.

When you lift weights, your muscles temporarily stop building protein, but right after you finish, they kick into high gear to repair and grow—this happens because key signaling molecules in your muscles get activated during recovery.

After a hard workout, ketone drink helps your muscles calm down their 'energy alarm' (AMPK) twice as fast as a placebo, likely because ketones give your muscles another fuel to burn and restore energy quicker.

For guys who don’t lift regularly, doing weight exercises doesn’t change a specific body signal (ERK1/2) 30 minutes after working out, no matter how hard or long they train — so this signal probably isn’t what tells their muscles to grow right after a fasted workout.

When young men do a specific type of hard weight training that focuses on lowering weights slowly, it triggers more muscle-building signals in their bodies compared to other common workout styles, even if the workout time is the same.