Tonic and phasic muscle theory originated in the late 1960s with Dr. Vladimir Janda, a Czech neurologist and physiotherapist. Using electromyography (EMG), Dr. Janda found that some muscles are practically always active and seemingly resistant to f
Tonic and phasic muscle theory originated in the late 1960s with Dr. Vladimir Janda, a Czech neurologist and physiotherapist. Using electromyography (EMG), Dr. Janda found that some muscles are practically always active and seemingly resistant to f