Effects of Exercise and Sports Intervention and the Involvement Level on the Mineral Health of Different Bone Sites in the Leg, Hip, and Spine: A Systematic Review and Meta-Analysis.
Autor: Oliveira, Thiago P.; Espada, Mário C.; Massini, Danilo A; A. M. Robalo, Ricardo; A. F. Almeida, Tiago; Hernández-Beltrán, Víctor; Gamonales, José M.; A. Castro, Eliane; Pessôa Filho, Dalton M.
Resumen: The current study analysed whether the osteogenic stimuli of exercises and sports have
an independent effect on bone mineral density (BMD). Studies with a design having two different
cohorts were searched and selected to distinguish the effect due to long-term involvement (i.e.,
athletes vs. non-active young with good bone health) and due to the planning of intervention (i.e.,
pre- vs. post-training) with exercises and sports. Moreover, only studies investigating the bone
sites with a body-weight support function (i.e., lower limb, hip, and spine regions) were reviewed,
since the osteogenic effects have incongruous results. A meta-analysis was performed following the
recommendations of PRISMA. Heterogeneity (I2) was determined by combining Cochran’s Q test with
the Higgins test, with a significance level of = 0.05. The studies reporting the effect of involvement
in exercise and sports showed high heterogeneity for the lower limb, total hip, and spine (I2 = 90.200%,
93.334%, and 95.168%, respectively, with p < 0.01) and the effect size on sports modalities (Hedge’s
g = 1.529, 1.652, and 0.417, respectively, with p < 0.05) ranging from moderate to high. In turn, the
studies reporting the effect of the intervention planning showed that there was no heterogeneity for
the lower limb (I2 = 0.000%, p = 0.999) and spine (I2 = 77.863%, p = 0.000); however, for the hip, it was
moderate (I2 = 49.432%, p = 0.054), with a low effect between the pre- and post-training moments
presented only for the hip and spine (Hedge’s g = 0.313 and 0.353, respectively, with p < 0.05). The
current analysis supported the effect of involvement in exercise and sports by evidencing the effect of
either weight-bearing or non-weight-bearing movements on BMD at the femoral, pelvic, and lumbar
bones sites of the athletes when comparing to non-athletes or non-active peers with healthy bones.
Moreover, the effect of different exercise and sports interventions highlighted the alterations in the
BMD in the spine bone sites, mainly with long-term protocols (~12 months) planned with a stimulus
with high muscle tension. Therefore, exercise and sport (mainly systematic long-term practice) have
the potential to increase the BMD of bones with body-weight support beyond the healthy values
reached during life phases of youth and adulthood.
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