推进力是决定短跑自行车性能的因素之一。踩踏率与功率输出有关,和刚度与提高运动任务的表现有关。
目的:探讨肌关节僵硬度与踩踏率的关系。
方法:22健康,未经训练的男性志愿者(19±2岁,175±6cm,74±16kg)在测试其肌肉关节(MA)刚度后分为两组,这些组是僵硬组(SG)和顺应性组(CG)。在四种循环模式下进行了6秒最大循环测试,是5级和10级空气阻力,3级和7级磁阻。峰值和平均节奏,峰值功率输出(POpeak),曲柄力(CFpeak),曲柄力发展的峰值速率(RCFD),并收集曲柄力峰值的角度。使用独立样本t检验评估两组之间对于这些变量的差异的显著性。计算了皮尔逊积矩相关性,以分析MA刚度与每个性能变量之间的关系。
结果:SG在3级磁阻时具有明显更高的峰值节奏和平均节奏,峰值曲柄力,和峰值功率输出在10级空气阻力,在5级空气阻力时曲柄力发展的峰值速率,10空气阻力,和3磁阻(p<0.05)。MA刚度与5级和10级空气阻力的平均节奏显着相关,所有4种模式下的峰值曲柄力,和RCFD和峰值功率输出在10级空气阻力。在每种循环模式下,MA刚度与曲柄力峰值角之间没有显着关系。
结论:结果表明,在这些条件下,具有相对较高MA硬度的参与者在6秒冲刺循环中似乎具有较高的踩踏率。他们还表现出优异的曲柄力和曲柄力发展速度,在冲刺循环时产生更大的功率输出。优化循环阻力或齿轮比以增强RCFD和肌肉肌腱刚度对于改善短跑循环性能至关重要。
Propulsive power is one of the factors that determine the performance of sprint cycling. Pedaling rate is related to power output, and stiffness is associated with improving performance in athletic tasks.
OBJECTIVE: to investigate the relationship between musculoarticular stiffness and pedaling rate.
METHODS: twenty-two healthy, untrained male volunteers (19 ± 2 years, 175 ± 6 cm, 74 ± 16 kg) were divided into two groups after their musculoarticular (MA) stiffness was tested, and these groups were the stiffness group (SG) and compliant group (CG). A 6-s maximal cycling test was conducted in four cycling modes, which were levels 5 and 10 air-resistance, and levels 3 and 7 magnetic-resistance. Peak and average cadence, peak power output (POpeak), crank force (CFpeak), peak rate of crank force development (RCFD), and the angle of peak crank force were collected. The significance of differences between the two groups for these variables was assessed using an independent samples t-test. Pearson product-moment correlations were calculated to analyze the relationship between MA stiffness and each performance variable.
RESULTS: the SG had significantly higher peak cadence and average cadence at level 3 magnetic-resistance, peak crank force, and peak power output at level 10 air-resistance, peak rate of crank force development at levels 5 air-resistance, 10 air-resistance, and 3 magnetic-resistance (p < 0.05). MA stiffness was significantly correlated with average cadence at levels 5 and 10 air-resistance, peak crank force in all 4 modes, and RCFD and peak power output at level 10 air-resistance. There were no significant relationships between MA stiffness and the angle of peak crank force in each cycling mode.
CONCLUSIONS: results indicate that participants with relatively higher MA stiffness seemed to have a higher pedaling rate during a 6-s sprint cycling in these conditions. They also performed a superior crank force and rate of crank force development, producing greater power output when sprint cycling. Optimizing cycling resistance or gear ratio to enhance both RCFD and musculotendinous stiffness may be crucial for improving sprint cycling performance.