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Muscle Power Predicts Adolescent Bone Strength: Iowa Bone Development Study.

Kathleen F Janz1, Elena M Letuchy, Trudy L Burns

  • 11Department of Health and Human Physiology, College of Liberal Arts and Sciences, University of Iowa, Ames, IA;2Department of Epidemiology, College of Public Health, University of Iowa, Ames, IA; and 3Department of Preventive and Community Dentistry, College of Dentistry, University of Iowa, Ames, IA.

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Area of Science:

  • Exercise Physiology
  • Bone Biology
  • Adolescent Health

Background:

  • Muscle power and bone strength are crucial for overall health.
  • Understanding the relationship between muscle power and bone health is vital for developing effective interventions.
  • Adolescence is a critical period for bone mass accrual and development of physical capabilities.

Purpose of the Study:

  • To investigate the association between lower body muscle power and bone strength in adolescents.
  • To examine the mediating effect of muscle cross-sectional area (MCSA) on the muscle power-bone strength relationship.
  • To explore sex-specific differences in these associations.

Main Methods:

  • 141 males and 162 females (approx. 17 years) participated.
  • Muscle power assessed via vertical jump and Sayers equation.
  • Tibia bone strength (compression and torsion) and MCSA measured using peripheral quantitative computed tomography (pQCT).

Main Results:

  • Strong significant correlations (r=0.54-0.78) found between muscle power, MCSA, and bone strength.
  • Associations remained significant after covariate adjustment (r=0.37-0.69).
  • Mediation models explained substantial variance in bone strength (38-77% across sexes and measures).

Conclusions:

  • Significant direct and indirect pathways exist between muscle power, MCSA, and tibia strength.
  • Results support the inclusion of muscle power as a key component of health-related fitness.
  • Findings advocate for muscle power assessment in bone health interventions for older adolescents.