Impact of NEURAC stability training on specific athletic performance and abdominal muscle activity among children and adolescents practicing volleyball

In addition to normal training participants will receive following exercises: Arm 1. NEURAC training - All exercises were conducted in closed kinematic chains on slings placed on the gym horizontal bar and ladders. The exercises were prepared to easily implement them in normal volleyball training. The order and description of exercises are as follows: 1. Blocking exercises: A) Starting position (SP): The player is lying face down, the upper limbs bent at the elbows, hands placed on slings, body is in one line. Movement: lifting the torso up (in line) with the movement of elbows straightening. At the beginning, the subjects are supported on their knees, and in the next training they supported on their toes. B) SP: as Above. Movement: moving the upper limbs forward. As a modification, a sensorimotor pillow was introduced to the exercise, under the toes. C) SP: The player is lying back, the upper limbs bent at the elbows, hands on slings, lower limbs based on the heels. Movement: lifting the torso up, straightening the elbows and lifting the upper limbs. 2. Attack exercises: A) SP: The player is face down, his hands on slings, body in a straight line, supported on the toes. Movement: the practitioner raises up the trunk, raising a hand in front. B) SP: The player is kneeling straight (knees on a sensorimotor pillow), hands on slings, arms in internal rotation. Movement: sweeping work by attacking upper limb. The exercises were carried out two times a week for eight weeks. Each exercise was performed in two series of eight repetitions. In each repetition, the subjects had to keep the ending position for three seconds. Between sets of exercises there was a five-minute break.. The exercises lasted about 20 minutes. The training was performed by professional trainer in small group. It was a supervised training. Register of attendance at sessions was conducted.