Effects of single-leg drop-landing exercise from different heights on skeletal adaptations in prepubertal girls: a randomized controlled study

Article Article scientifique Article Effects of single-leg drop-landing exercise from different heights on skeletal adaptations in prepubertal girls: a randomized controlled study eng 2008 author Wiebe Peter N. author Blimkie Cameron Joseph Ross 134368 author Farpour-Lambert Nathalie 41294 author Briody Julie author Marsh Damian author Kemp Allan author Cowell Chris author Howman-Giles Roberts 211-228 10.1123/pes.20.2.211 18579901 0899-8493 Few studies have explored osteogenic potential of prepubertal populations. We conducted a 28-week school-based exercise trial of single-leg drop-landing exercise with 42 prepubertal girls (6 to 10 years) randomly assigned to control (C), low-drop (LD) or high-drop (HD) exercise groups. The latter two groups performed single-leg drop-landings (3 sessions/week-1 and 50 landings/session-1) from 14 cm(LD) and 28 cm(HD) using the nondominant leg. Osteogenic responses were assessed using Dual Energy X-ray Absorptiometry (DXA). Single-leg peak ground-reaction impact forces (PGRIF) in a subsample ranged from 2.5 to 4.4 x body-weight (BW). No differences (p > .05) were observed among groups at baseline for age, stature, lean tissue mass (LTM), leisure time physical activity, or average daily calcium intake. After adjusting for covariates of body mass, fat mass and LTM, no differences were found in bone mineral measures or site-specific bone mineral density (BMD) at the hip and lower leg among exercise or control groups. Combining data from both exercise groups failed to produce differences in bone properties when compared with the control group. No changes were apparent for between-leg differences from baseline to posttraining. In contrast to some reports, our findings suggest that strictly controlled unimodal, unidirectional single-leg drop-landing exercises involving low-moderate peak ground-reaction impact forces are not osteogenic in the developing prepubertal female skeleton. Absorptiometry, Photon *Adaptation, Physiological Body Height/*physiology Bone Density Child Exercise/*physiology Exercise Test Female Humans Leg/*physiology Life Style Motor Activity Muscle, Skeletal/*physiology Posture Puberty/*physiology Dewey 618 58 Département de pédiatrie, gynécologie et obstétrique 223 false 179 L'hypertension pulmonaire (pédiatrie) 228 Pediatric exercise science 20 2 Faculté de médecine / Section de médecine clinique / Département de pédiatrie, gynécologie et obstétrique

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Effects of single-leg drop-landing exercise from different heights on skeletal adaptations in prepubertal girls: a randomized controlled study	Pediatric exercise science			2008	615	0

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Blimkie, Cameron Joseph Ross