Figure 4. Effects of bed rest and following physical retraining on the level of co‐contraction at the knee and ankle joint in older adults enrolled in the Control group, Interventions group and in Young subjects.

Values are mean ± SE. Control group (Old_Ctrl, ●), Interventions group (Old_Int, ♦) and Young subjects (○). Level of co‐contraction between biceps femoris and vastus lateralis (Knee, A) and between tibialis anterior and gastrocnemius medialis (Ankle, B) recorded during explosive efforts of the lower limbs before bed rest (Pre), after bed rest (Post‐BR) and after physical retraining (R + 14). Differences in the level of Knee and Ankle co‐contraction were tested using general linear model and following post hoc analysis with Bonferroni corrections. ^*Difference between periods in the two Old groups.