Prior research did not provide data on acute adaptations to changes in saddle height as commonly performed in bicycle fitting. This study assessed the acute responses from recreational cyclists to changes in saddle height using dynamic bicycle fitting. Ten recreational cyclists completed five trials using three saddle heights (Preferred, High and Low), one Sham-height trial and a final repeated trial for assessment of intra-session reliability. High and Low saddle heights were determined based on dynamically measured knee flexion angles (±10° from their Preferred height). Trials were performed for 30-s at 90 ± 2 rpm and 2.5 W/kg (181 ± 32 W). Perceived comfort and discomfort and rating of perceived exertion were assessed at the end of each trial. Significant differences were determined when p < 0.05. Increased comfort was observed at the preferred saddle height compared to a lower saddle height (p = 0.03) but no differences were observed between Preferred and High (p = 0.69) or High vs. Low (p = 0.06). The Sham height was also not different from its equivalent saddle height (p = 0.77) and rating of perceived exertion did not differ between saddle heights (p = 0.33). Recreational cyclists were generally sensitive to changes in saddle height given they reported different levels of comfort between their preferred and a lower saddle height. Similar levels of comfort were observed when a Sham height was introduced, showing that recreational cyclists identified that no change in saddle height was conducted. However, these cyclists could not report differences in comfort when cycling at a High compared to a Low saddle height.

中文翻译：

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骑自行车时鞍座高度变化对感知舒适度的急性影响

先前的研究没有提供关于自行车装配中常见的鞍座高度变化的急性适应数据。本研究使用动态自行车配件评估了休闲自行车手对鞍座高度变化的急性反应。十名休闲自行车手使用三种鞍座高度（首选、高和低）完成了五次试验、一次假高度试验和最后一次重复试验，以评估会话内的可靠性。高和低鞍座高度是根据动态测量的膝关节屈曲角度（从他们的首选高度±10°）确定的。在 90 ± 2 rpm 和 2.5 W/kg (181 ± 32 W) 下进行了 30 秒的试验。在每次试验结束时评估感知舒适度和不适感以及感知用力等级。当 p < 0.05 时确定显着差异。与较低的鞍座高度 (p = 0.03) 相比，在首选鞍座高度上观察到了更高的舒适度，但在首选和高 (p = 0.69) 或高与低 (p = 0.06) 之间没有观察到差异。Sham 高度也与其等效鞍座高度 (p = 0.77) 没有区别，并且在鞍座高度之间感知用力的等级没有差异 (p = 0.33)。休闲自行车手通常对鞍座高度的变化很敏感，因为他们报告了他们喜欢的鞍座高度和较低的鞍座高度之间的舒适度不同。当引入假高度时观察到类似的舒适度，这表明休闲骑自行车的人发现鞍座高度没有变化。然而，这些骑自行车的人无法报告与低鞍座高度相比，在高鞍座高度骑自行车时的舒适度差异。