ProActionClinic a mené plusieurs années de recherches et de synthèse de nombreux travaux scientifiques et a mis au point le coussin extensit.

Extensit est la bases d’une nouvelle stratégie d’approche des troubles posturaux et des maux de dos qui y sont probablement liés.



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« Pre-exercise routines are common practice for the majority of individuals participating in sport. Though the optimal pre-exercise routine is debated, stretching is also usually incorporated pre-exercise as it has been suggested to improve muscle flexibility, prevent muscle injury and enhance physical performance.

Hamstring strains are one of the most common, recurrent injuries experienced in the sporting world and often result in significant time out of sport and activity.

Decreased hamstring flexibility is suggested to be one of the predisposing factors for hamstring strains (1-16). »

Permanent  tension and shortening of hamstring is frequently combined with knee flexum : precise testing show that complete knee extension is lost ; also this is obvious  in standing position ; most of the time   iliopsoas muscles shortening is  simultaneously present at least due to flexion of thigh on the pelvis related to knee flexum .

As demonstrated with studies, shortening of hamstring correspond to shortening of iliopsoas muscles.(17)

For that reason , to avoid hamstring decrease of flexibility,  we suggest hamstring stretching to be combined with iliopsoas stretching .

Unfortunately, stretching  iliopsoas muscles is not easy ; proposed exercises show often no result  or are unperfectly executed and,  indeed, maintaining stretching position for an adequate  time is often uncomfortable.

The Extensit cushion induces a posture allowing a gradual, gentle, painless stretching and with programmable duration.
The patient may remain clothed, removing the belt. Supine, the sacrum is maintained by the nose of the cushion,the column is extended, so the two hip bones and the coxofemoral joints gently go down : the iliopsoas muscles stretch slowly.
And especially : this stretching is bilateral.

Extensit cushion can be used in complement with  other medical treatment : see scientific studies and  speak to your therapist !


  1. Booth L. Mobility, stretching and warm-up: Applications in sport and exercise. SportEX Medicine. 2008;37:20–23.
  2. Shrier I. Does stretching improve performance? A systematic and critical review of the literature. Clin J Sport Med . 2004;14:267–273. doi: 10.1097/00042752-200409000-00004. [PubMed] [Cross Ref]
  3. Bishop D. Warm up 1. Potential Mechanisms and the effects of passive warm up on exercise performance. Journal of Sports Medicine. 2003;33:439–454. doi: 10.2165/00007256-200333060-00005. [PubMed] [Cross Ref]
  4. McMillian D, Moore J, Hatler B, Taylor D. Dynamic vs. Static-Stretching Warm Up: The Effect on Power and Agility Performance. J Strength Cond Res . 2006;20:492–499. doi: 10.1519/18205.1. [PubMed] [Cross Ref]
  5. Young W, Behm D. Should Static Stretching be used during a Warm-Up for Strength and Power Activities? Journal of Strength and Conditioning. 2002;24:33–37.
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  7. Cross K, Worrell T. Effects of a Static Stretching Program on the Incidence of Lower Extremity Musculotendinous Strains. Journal of Athletic Training. 1999;34:11–14.[PMC free article] [PubMed]
  8. Worrell T, Perrin D. Hamstring Muscle Injury: The Influence of Strength, Flexibility, Warm-Up, and Fatigue. J Orthop Sports Phys Ther . 1992;16:12–18. [PubMed]
  9. Orchard J, Seward H. Epidemiology of injuries in the Australian football league, seasons 1997–2000. British Journal of Sports Medicine. 2002;36:39–45. doi: 10.1136/bjsm.36.1.39.[PMC free article] [PubMed] [Cross Ref]

10.  Hartig D, Henderson D. Increasing Hamstring Flexibility Decreases Lower Extremity Overuse Injuries in Military Basic Trainees. The American Journal of Sports Medicine. 1999;27:173–176. [PubMed]

11.  Jonhagen S, Németh G, Eriksson E. Hamstring Injuries in Sprinters – The Role of Concentric and Eccentric Hamstring Muscle Strength and Flexibility. The American Journal of Sports Medicine. 1994;22:262–266. doi: 10.1177/036354659402200218. [PubMed] [Cross Ref]

12.  Cross KM, Worrell TW. Effects of a Static Stretching Program on the Incidence of Lower Extremity Musculotendinous Strains. Journal of Athletic Training. 1999;34:11–14.[PMC free article] [PubMed]

13.  Liemohn W. Factors related to hamstring strains. J Sports Med Phys Fitness . 1978;18:71–76. [PubMed]

14.  Witvrouw E, Danneels L, Asselman P, D'Have T, Cambier D. Muscle Flexibility as a Risk   Factor for Developing Muscle Injuries in Male Professional Soccer Players: A Prospective Study. The American Journal of Sports Medicine. 2003;31:41–46. [PubMed]

15.  Bandy WD, Irion JM, Briggler M. The effect of time and frequency of static stretching on flexibility of the hamstring muscles. Phys Ther. 1997 Oct;77(10):1090-6.

16.  de Weijer VC, Gorniak GC, Shamus E .The effect of static stretch and warm-up exercise on hamstring length over the course of 24 hours. J Orthop Sports Phys Ther. 2003 Dec;33(12):727-33

17.  Rhie TY1, Sung KHPark MSLee KMChung CY J hamstring and psoas length of crouch    gait in cerebral palsy: a comparison with induced crouch gait in age- and sex-matched controls J Neuroeng Rehabil. 2013 Jan 30;10:10. doi: 10.1186/1743-0003-10-10.









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