Rate modulation of human anconeus motor units during high-intensity dynamic elbow extensions

We recorded single MUFRs during a high-intensity fatiguing dynamic elbow extension task. Because of unique features, the anconeus muscle (an accessory elbow extensor) facilitates tracking of units during rapid maximal effort concentric contractions at a moderately high load. Despite baseline dynamic rates being higher than those recorded during isometric maximum contractions, there was a decrease in MUFRs over the ∼80-s fatiguing protocol, indicating rate reduction is a common feature to both isometric and dynamic high-intensity fatiguing tasks.