A Novel Noninvasive Method for Measuring Fatigability of the Quadriceps Muscle in Noncooperating Healthy Subjects

Figure 2

A recording of typical subject’s force output during the fatigue test. An initial single-twitch series was followed by 40 tetanic contractions, after which a final single-twitch series was done. STW: single twitch; TC: tetanic contractions; Nm: newton meters.