Figure 4

The results for onset timing of VMO and VL during the patellar tendon reflex reaction. A negative VMO-VL value indicates VMO activation before VL activation. 2. Data for mean was extracted from charts rather than the text for Voight and Weider [6]. 3. Standard deviation for Voight and Wieder [6] and Witrouw et al [18] is an estimate based on data from Karst and Willet [30] and Witrouw et al [13]. 4. Small study bias: Begg's test p = 0.73, Egger's test p = 0.11.