Validation of the physical working capacity at the fatigue threshold treadmill test

摘要: The purposes of the present study were twofold: 1) to determine physical working capacity at fatigue threshold (PWCFT) during an incremental treadmill test, and 2) examine validity this fatigue threshold through constant-velocity runs exhaustion 90, 100, 110% estimated PWCFT. Twelve aerobically-trained males (mean age±SD=24.6±5.4 years, running volume=69.9±46.0 km·wk-1, n=9) females (22.3±2.3 45.6±4.6 n=3) volunteered perform a test with electromyographic (EMG) signals recorded from m. vastus lateralis on four separate visits. First visit required each subject complete for determination their During second, third, fourth visit, subjects completed run constant velocity that corresponded or PWCFT in random order. linear regression analyses indicated there no significant (p>.05) changes muscle activation (i.e. EMG amplitude) across time 90% (60.00±0.00 min) 100% (48.86±14.59 PWCFT, but (p<.05) increases occurred (19.44±10.26 min). Thus, findings was able accurately estimate fastest could be maintained extended period without evidence neuromuscular fatigue. Key words: activation, amplitude, running,