Table 1

Description of the core stability exercise protocol

WeekCore stability exercise
1–4Low-load exercises (mat exercises)
  1. Train TrA muscle activation in a supine/prone lying position without spinal and pelvic movements for 10 s with 10 repetitions, while keeping respiration normal (abdominal drawing-in manoeuvre, ADIM).

  2. Train LM muscle activation in a prone lying position. Raise the contralateral arm/leg while performing the ADIM for 10 s with 10 repetitions.

  3. Perform ADIM in a crook lying position with hips at 45° and knees at 90°. Then abduct one (right/left) leg to 45° of hip abduction and sustain for 10 s.

  4. Train ADIM in a crook lying position with hips at 45° and knees at 90° as described previously. Then slide one leg down until the knee is straight, maintain it for 10 s, and then slide it back up to the starting position.

  5. Perform ADIM and raise the buttocks off a couch from a crook lying position until the shoulders, hips and knees are in straight alignment. Keep the position for 10 s and then lower the buttocks back down to the couch with 10 repetitions.

  6. Perform ADIM and raise the buttocks off a couch from a crook lying position until the shoulders, hips and knees are in straight alignment, then straighten one (right/left) leg. Sustain this posture for 10 s and then back up to the starting position with 10 repetitions.

  7. Perform ADIM and raise one (right/left) leg from a four-point kneeling position and maintain the trunk in a neutral position. Sustain the posture for 10 s and then back up to the starting position with 10 repetitions.

  8. Perform ADIM and raise one (right/left) arm and contralateral leg from a four-point kneeling position and maintain the trunk in a neutral position. Sustain the position for 10 s and then return to the starting position with 10 repetitions.

5–8High-load exercises (sling exercises)
  1. Lay supine on the treatment bench with arms cross over the chest, the hips and knees bent to 90°. The knees and ankle joints were placed into two slings per leg. Perform ADIM, then raise the buttocks off the bench while maintaining straight alignment of the knees, hips and shoulders. Hold this position for 10 s with 10 repetitions and then will be instructed to lower back to the starting position.

  2. Lay supine on the treatment bench with arms cross over the chest, the hips and knees bent to 90°. One leg remains in the slings and the other leg was not in the sling. Hold the leg at the same level as the other, perform ADIM, and then raise the buttocks off the bench while maintaining straight alignment of the knees, hips and shoulders. Keep this position for 10 s and then will be instructed to lower back to the starting position.

  3. Lay supine on the treatment bench with arms cross over the chest with the ankle joints placed into one sling per leg. Perform ADIM, then raise the buttocks off the bench while maintaining straight alignment of the ankles, knees, hips and shoulders. Hold this position for 10 s with 10 repetitions and then will be instructed to lower back to the starting position.

  4. Lay supine on the treatment bench with arms cross over the chest and one ankle joint placed in a sling. Hold the other leg at the same level as the one suspending in the sling. Perform ADIM, then raise the buttocks off the bench while maintaining straight alignment of the ankles, knees, hips and shoulders. Hold this position for 10 s with 10 repetitions and then will be instructed to lower back to the starting position.

  5. Lay supine on the treatment bench with arms cross over the chest. The head is placed into one sling, the chest into a wider sling and the knees and ankle joints are placed into two slings. A height-adjustable bench was lowered until the subject hung with the whole body weight in the sling system. Perform ADIM, place the subject’s pelvis in a neutral position between the knee and shoulder for 10 s with 10 repetitions and then will be instructed to lower back to the starting position.

  6. Lay prone on the treatment bench with arms cross over the chest. The head is placed into one sling, the chest into a wider sling and the knees and ankle joints are placed into two slings. The bench is lowered until the subject hung with the whole body weight in the sling system. Perform ADIM, place the subject’s pelvis in a neutral position between the knee and shoulder for 10 s and then will be instructed to lower back to the starting position.

  • LM, lumbar multifidus; TrA, transversus abdominis.