Purpose: The aim of this study was to access the effect of lower limb asymmetry in field test when symmetry measurement system intervenes. Methods: This study recruited 14 participants (height: 172.1 3.9 cm, weight: 64.2 5.3kg, age: 21.9 1.6 year-old). The wireless EMG was applied to observe the bilateral muscle activation in lower limb (rectus femoris, bicep femoris, tibialis anterior, gastrocnemius) with and without symmetry monitoring system in outdoor cycling. The asymmetry index (AI) was calculated by the percentage difference between right (R) and left (L) sides. The repeated measurement ANOVA was used. The significance level was set as =.05. Results: The intervention of symmetry monitoring system would improve the bilateral symmetry of rectus femoris and gastrocnemius. Conclusion: The intervention of symmetry monitoring system could improve the asymmetry phenomenon in lower limb, possibly postpone the onset of fatigue and reducer injury rate.
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