Muscle-to-Bone Ratio in Division I Collegiate Football Players by Position
2023-05
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Muscle-to-Bone Ratio in Division I Collegiate Football Players by Position
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2023-05
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BACKGROUND: An emerging topic of interest in athletics is the muscle-to-bone ratio (MBR). Previous work has demonstrated differences in body composition between football positions but have not characterized MBR differences via position in football players The purpose of the present study was to compare the MBR determined using dual X-ray absorptiometry (DXA) in National Collegiate Athletic Association (NCAA) Division I collegiate football players (CFP) to age-matched controls. In addition, we explored positional differences in MBR in CFP.METHODS: A total of 553 CFP and 261 controls underwent a DXA scan to determine lean mass (LM), fat mass (FM), and bone mineral content (BMC). The MBR was obtained by dividing LM by BMC. CFP were categorized by positions defined as: offensive line (OL), defensive line (DL), tight end (TE), linebacker (LB), running back (RB), punter/kicker (PK), quarterback (QB), defensive back (DB), and wide receiver (WR). Independent samples t-tests were done to examine total and regional differences in body composition measures between CFP and controls. ANOVA with post-hoc adjustments (TukeyHSD) were used to examine possible differences in body composition measures across positions. Significance was set at an alpha level of p≤0.05.
RESULTS: There were significant differences between CFP and controls for total LM (80.1±10.0 vs. 56.9±7.8 kg), FM (22.2±12.5 vs. 15.2±7.1 kg), and BMC (4.3±0.5 vs. 3.1±0.5 kg) respectively. However, there was no significant difference in total MBR between CFP and controls (18.6±1.4 vs. 18.8±1.7). Regionally, CFP had significantly lower trunk MBR than controls (26.7±2.7 vs. 28.7±4.2), but no difference was seen in leg or arm MBR. In CFP, significant differences in MBR by position were observed. Total MBR was significantly higher in DL (19.0±1.4) than DB (18.1±1.3), WR (18.0±1.3), and LB (18.2±1.3). OL had a significantly higher total MBR (19.2±1.3) than DB (18.1±1.3), LB (18.2±1.3), QB (18.1±1.0) and WR (18.1±1.3). In addition, RB had a significantly higher total MBR (18.8±1.3) than DB (18.1±1.3) and WR (18.1±1.3).
CONCLUSION: Although there were significant differences in body composition between CFP and aged-matched controls, there were no differences in total or regional MBR, except in trunk MBR. In CFP, both DL and OL had significantly higher MBR than DB, WR, LB. The current study may provide athletes and athletic performance staff with normative values when evaluating total and regional MBR with DXA.
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University of Minnesota M.S. thesis. May 2023. Major: Kinesiology. Advisor: Donald Dengel. 1 computer file (PDF); vii, 42 pages.
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Studee, Hannah. (2023). Muscle-to-Bone Ratio in Division I Collegiate Football Players by Position. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/259599.
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