Key result
The ACTN3 RR genotype was associated with significantly higher dynamic quadriceps torques at 300 degrees/s and a greater percentage of type IIx muscle fibers compared with the XX genotype (P<0.05).
Why the study?
Does the ACTN3 R577X genotype affect muscle fiber type distribution and knee extension strength in healthy young men?
Population
90 healthy young men (18-29 y)
Comparison
ACTN3 R577X RR genotype vs ACTN3 R577X XX genotype
Design
Cross-sectional
Authors
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ACTN3 R577X may influence fiber-type heritability; leaves open its role in performance prediction.
Cross-Sectional (n=90)
Does the ACTN3 R577X genotype affect muscle fiber type distribution and knee extension strength in healthy young men?
p-value: p=<0.05
Vincent et al. (2007) conducted a cross-sectional in Healthy (n=90). ACTN3 R577X RR genotype vs. ACTN3 R577X XX genotype was evaluated on Relative dynamic quadriceps torques at 300 degrees/s and type IIx fiber characteristics (p=<0.05). The ACTN3 RR genotype was associated with significantly higher dynamic quadriceps torques at 300 degrees/s and a greater percentage of type IIx muscle fibers compared with the XX genotype (P<0.05).
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