title: Jumping improves lower limbs bone mass and lean mass in elite jumpers.
abstract: BACKGROUND
  The present study was designed to examine the influence of extreme impact loading induced by jump training on bone mineral density (BMD) and bone mineral content (BMC) in high level jumpers.
  
  
  METHODS
  Forty boys volunteered for the study aged 20 to 21 years. They were 22 high level jumpers and 18 controls. Bone mass and body composition measurements were performed by dual-energy X-ray absorptiometry, in the total body and at different sites.
  
  
  RESULTS
  The results showed that BMC, BMD, bone area, and lean mass (P<0.0001) were significantly higher in the jumpers compared to the controls. A strong positive correlation was found between lean mass and bone parameters (BMC at the right femur, r=0.80; P<0.01). The values of the same correlation were weak in the control group. In addition, the effects of the regular practice of jumping on the BMD, BMC, and bone area were more pronounced in the lower limbs (P<0.01). These adaptations were site-specific, with increased bone mass at the lower limbs (P<0.01), especially at the legs, right and left leg (LRL) (P<0.05). It appears that the time dedicated to this activity may be account for the difference between jumpers and controls.
  
  
  CONCLUSIONS
  The practice of high level jump starting at pubertal age generates an increase and an acquisition of the bone mass in males. This adaptation is further enhanced by the times dedicated for this activity. Therefore, it would be interesting to program jumping activities daily to conserve bone mineral and to prevent osteopenia.
authors.affiliation: Laboratoire de Physiologie et des Explorations Fonctionnelles, Faculté de Médecine Ibn El Jazar Sousse, Université de Sousse, Hôpital Farhat Hached, Sousse, Tunisia - hela_trabelsi@ymail.com.
authors.forename: Hela
authors.initials: H
authors.lastname: Trabelsi
authors.affiliation: Laboratoire de Physiologie et des Explorations Fonctionnelles, Faculté de Médecine Ibn El Jazar Sousse, Université de Sousse, Hôpital Farhat Hached, Sousse, Tunisia.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Elloumi
authors.affiliation: Service de Biochimie Clinique, Hôpital Charles Nicolle, Tunis, Tunisia.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Mrad
authors.affiliation: Laboratoire de Physiologie et des Explorations Fonctionnelles, Faculté de Médecine Ibn El Jazar Sousse, Université de Sousse, Hôpital Farhat Hached, Sousse, Tunisia.
authors.forename: Chirine
authors.initials: C
authors.lastname: Aouichaoui
authors.affiliation: Laboratoire de Physiologie et des Explorations Fonctionnelles, Faculté de Médecine Ibn El Jazar Sousse, Université de Sousse, Hôpital Farhat Hached, Sousse, Tunisia.
authors.forename: Sabri G
authors.initials: SG
authors.lastname: Chortane
authors.affiliation: Laboratoire de Recherche Immuno-rhumatologie, Service de Rhumatologie, Hôpital La Rabta, Tunis, Tunisia.
authors.forename: Ilhem
authors.initials: I
authors.lastname: Cheour
authors.affiliation: Laboratoire de Physiologie et des Explorations Fonctionnelles, Faculté de Médecine Ibn El Jazar Sousse, Université de Sousse, Hôpital Farhat Hached, Sousse, Tunisia.
authors.forename: Zouhaier
authors.initials: Z
authors.lastname: Tabka
mesh_terms: D015502:Absorptiometry, Photon; D001696:Biomechanical Phenomena; D001823:Body Composition; D015519:Bone Density / Q000502:physiology*; D001842:Bone and Bones / Q000378:metabolism*; D005269:Femur / Q000502:physiology; D006801:Humans; D007866:Leg / Q000502:physiology; D008297:Male; D010807:Physical Endurance; D010809:Physical Fitness; D059385:Plyometric Exercise; D011627:Puberty; D013177:Sports; D055815:Young Adult