Table 2. Incidence (% occurrence in all trials) of biceps femoris quiescence during hip-trunk flexion. Each subject performed four trials under stable and unstable base conditions. Stable Unstable 4 / 4 trials 44.4% 5.5% 2-3 / 4 trials 11.1% 27.7% 0-1 / 4 trials 44.4% 66.6%