Ashley N. FoxƗ1, John W. Farrell IIIƗ1, Rebecca D. Larsonǂ1 1University of Oklahoma, Norman, OK

Bilateral asymmetry in peak crank toque has been observed in both cyclist and non-cyclist. However, the relationship between exercise intensity, cadence rates, and bilateral asymmetry is not fully understood. Additionally, a need for establishment of normative values for bilateral asymmetry still exists. PURPOSE: Therefore, the purpose of the current study was to examine bilateral asymmetry in peak crank torque during 3 graded exercise tests (GXT) at 3 different cadence zones. METHODS: 20 subjects, 10 females and 10 males, participated in this study. Subjects were classified to either a cycling trained group (CT, n=8) or no-cycling trained group (NCT, n=12). Over the course of 3 visits subjects, both groups performed 3 GXTs at 3 different cadence zones. Cadence zones consisted of Self-Selected (SS), High (100 to 115 rpm), and Low (55 to 70 rpm). The first GXT was performed at the SS cadence with the remaining two being performed either at High or Low cadence, which was randomly assigned. Peak crank torque was measured using a dual power meter on cycle ergometer, and calculated as the absolute difference between the lower limbs. Peak crank torque was assessed at the initial stage (IS), the stage in which the onset of blood lactate accumulation (OBLA) occurred, and the stage in which peak power output (PPO) was achieved for the 3 different GXTs. Two way repeated measures ANOVA was used to determine if significant differences between groups and conditions existed. RESULTS: Significant group by condition interactions were present. No significant condition differences were present between all cadences zones (IS, OBLA, or PPO) (P>0.05). No significant group differences were present at IS or OBLA. However, significant group differences were present at PPO (CT 7.69±5.61 vs. NCT 4.42±4.47). CONCLUSION: The findings of the current study suggest that torque is unaffected by cadence selection at IS, OBLA, and PPO. The current study also showed that significant differences did not exist between the CE and NCE in torque asymmetry until PPO. This finding suggests that at PPO cyclist may be altering their kinematics in order to maintain desired cadences or power outputs more so than non-cyclists. Therefore, further research is needed to understand the potential effect on cycling performance.

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