Higher instability conditions increase postural control and balance requirements, enhancing core muscle activity to stabilize the body [6]. Instability resistance training may be performed using the own body weight and/or with external loads, either on stable surface or unstable surface [7]. Postural manipulations as reducing the base of support [8,9] or performing standing exercises instead of seated exercises [10] has been recommended to challenge postural control and core muscle activity respectively. Exercises performed by reducing the base of support increased muscle activity in the stabilizer muscles of the ankle [11,12] and increased core muscle activity during bridging exercises [13]. However, the possibility to increase core muscle activity by narrowing the base of support during standing and seated positions remains uninvestigated and supposes a novel exercise variation. Furthermore, it is unknown if additional elastic resistance during these positions lead to higher core muscle activity.
Higher instability conditions increase postural control and balance requirements, enhancing core muscle activity to stabilize the body [6]. Instability resistance training may be performed using the own body weight and/or with external loads, either on stable surface or unstable surface [7]. Postural manipulations as reducing the base of support [8,9] or performing standing exercises instead of seated exercises [10] has been recommended to challenge postural control and core muscle activity respectively. Exercises performed by reducing the base of support increased muscle activity in the stabilizer muscles of the ankle [11,12] and increased core muscle activity during bridging exercises [13]. However, the possibility to increase core muscle activity by narrowing the base of support during standing and seated positions remains uninvestigated and supposes a novel exercise variation. Furthermore, it is unknown if additional elastic resistance during these positions lead to higher core muscle activity.
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