High-volume back squats induce immediate and broad impairments in force, displacement, and work output, while deadlifts induce more selective and persistent deficits in rapid force production and reactive strength, indicating distinct neuromuscular fatigue profiles and recovery requirements between the two exercises.

After heavy squats, muscles get tired from built-up waste chemicals that slow down their ability to contract, and the nervous system stops sending strong signals, making the whole body feel weak and slow. After heavy deadlifts, the muscles still work, but the body loses its ability to quickly generate force when bouncing or reacting, because the nerves controlling fast movements stay tired longer and the muscles don't stretch and recoil properly.