Abstract
Compared to trained runners, novice runners employ lower stride frequencies and shorter stride lengths as they run at lower speeds vs trained runners. Novice cyclists may benefit from a similar paradigm, utilizing shorter crank lengths as an analog to the lower stride frequencies and shorter stride lengths used by novice runners. PURPOSE: To determine the impact of short crank arms on novice cyclist’s performance and comfort during a bout of moderate intensity cycling. METHODS: A total of 14 male novice cyclists (25.9 ± 6.9 yrs.) were included in the current study. Subjects completed an incremental cycle test to determine V[Combining Dot Above]O2peak. Experimental trials were performed in a randomized counterbalanced format. The experimental trials consisted of 30 min cycling bouts at 60% of V[Combining Dot Above]O2peak, with one session using crank arms set to 175mm (normal length), and the other session the crank arms set to 145mm (short length). Bike fit was replicated for all trials. Repeated Measures ANOVAs were used to compare blood lactate, power output, RPM, HR, RER, V[Combining Dot Above]E , and RPE across experimental trials and time. RESULTS: Power output was significantly greater during the short crank arm trial when compared to the normal crank arm trial at 10 min (136.8 ± 8.1 vs. 132.5 ± 7.9 W, p = 0.012) , 15 min (138.9 ± 8.5 vs. 133.6 ± 7.9 W, p = 0.002), 20 min (139.3 ± 8.4 vs. 132.1 ± 8.0 W, p = 0.002), 25 min (136.1 ± 8.0 vs. 130.0 ± 8.0 W, p = 0.002), and 30 min (134.3 ± 8.1 vs. 128.6 ± 8.0 W, p = 0.006) at 60% of V[Combining Dot Above]O2peak. All other variables did not differ between crank length trials. CONCLUSION: Novice cyclists were able to maintain a higher power output with no increase in physiological measures. The higher power output may be attributed to the slower pedal velocities and more extended hip and knee joints allowing for slower muscle contractions combined with an improved mechanical advantage.
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