Total and Lower Extremity Lean Mass Percentage Positively Correlates With Jump Performance. Issue 8 (August 2015)

• Record Type: Journal Article
• Authors: Stephenson, Mitchell L.; Smith, Derek T.; Heinbaugh, Erika M.; Moynes, Rebecca C.; Rockey, Shawn S.; Thomas, Joi J.; Dai, Boyi
• Is Part Of: Journal of strength and conditioning research. Volume 29:Issue 8(2015)
• Publication Date: 2015-08
• Subjects: DXA -- strength assessment -- power -- jump height; Physical education and training -- Periodicals; Weight training -- Physiological aspects -- Periodicals; Physical fitness -- Periodicals; 613.7
• DOI: 10.1519/JSC.0000000000000851
• Languages: English
• ISSNs: 1064-8011

Abstract

Abstract : Abstract: Stephenson, ML, Smith, DT, Heinbaugh, EM, Moynes, RC, Rockey, SS, Thomas, JJ, and Dai, B. Total and lower extremity lean mass percentage positively correlates with jump performance. J Strength Cond Res 29(8): 2167–2175, 2015—Strength and power have been identified as valuable components in both athletic performance and daily function. A major component of strength and power is the muscle mass, which can be assessed with dual-energy x-ray absorptiometry (DXA). The primary purpose of this study was to quantify the relationship between total body lean mass percentage (TBLM%) and lower extremity lean mass percentage (LELM%) and lower extremity force/power production during a countermovement jump (CMJ) in a general population. Researchers performed a DXA analysis on 40 younger participants aged 18–35 years, 28 middle-aged participants aged 36–55 years, and 34 older participants aged 56–75 years. Participants performed 3 CMJ on force platforms. Correlations revealed significant and strong relationships between TBLM% and LELM% compared with CMJ normalized peak vertical ground reaction force ( p < 0.001, r = 0.59), normalized peak vertical power ( p < 0.001, r = 0.73), and jump height ( p < 0.001, r = 0.74) for the combined age groups. Most relationships were also strong within each age group, with some relationships being relatively weaker in the middle-aged and older groups. Minimal difference was found between correlation coefficients of TBLM% and LELM%. Coefficients of determination were all below 0.6 for the combined group, indicating that between-participant variability in CMJ measures cannot be completely explained by lean mass percentages. The findings have implications in including DXA-assessed lean mass percentage as a component for evaluating lower extremity strength and power. A paired DXA analysis and CMJ jump test may be useful for identifying neuromuscular deficits that limit performance.