Central Factors Contribute to Knee Extensor Strength Loss after 2000-m Rowing in Elite Male and Female Rowers.

Purpose: Despite growing interest in task-dependent alterations of central and peripheral fatigue following endurance exercise, little is known about the impact of rowing on quadriceps muscle fatigue. This study aimed to investigate central and peripheral mechanisms of fatigue following a 2000-m rowing time-trial. Methods: Eight competitive rowers (4 males, 4 females, 20 +/- 4 years) performed a 2000-m time-trial on an indoor rower and a control condition (sitting). Neuromuscular function of the knee extensors was analyzed prior to and 3 min after each experimental condition. Maximal voluntary torque, voluntary activation and normalized root mean square of the EMG signal were measured during isometric and concentric contractions. Furthermore, knee extensor twitch torque and maximal M-wave amplitudes in response to electrical nerve stimulation were assessed. Results: After 2000-m rowing, there were significant reductions in isometric and concentric maximal voluntary torque of the knee extensors (-20 +/- 9%; -18 +/- 7%; P

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