Sanford Thomas, Gadzinski Adam J, Gaither Thomas, Osterberg E Charles, Murphy Greg P, Carroll Peter R, Breyer Benjamin N
Department of Urology, University of California San Francisco, San Francisco, CA, USA.
Department of Urology, University of California San Francisco, San Francisco, CA, USA.
Sex Med. 2018 Sep;6(3):239-247. doi: 10.1016/j.esxm.2018.05.002. Epub 2018 Jun 20.
Genital numbness and erectile dysfunction in cyclists may result from repeated perineal impacts on the bicycle saddle (micro-trauma) that occur during routine cycling.
To evaluate the relationship between oscillation forces and perineal pressures among cyclists in a simulated laboratory setting.
Participants were fit to a study bicycle to ensure all cyclists had the same torso angle (60 ± 1 degree) and maximum knee angle (150 ± 1 degree). A lever system was used to generate oscillation events of 3 progressively increasing magnitudes. Perineal pressure was continuously measured using a pressure sensor on the bicycle saddle. This process was carried out in each of the following conditions: (1) stationary (not pedaling) with the standard seatpost, (2) pedaling with standard seatpost, (3) stationary with seatpost shock absorber, and (4) pedaling with seatpost shock absorber.
We compared perineal pressure changes during oscillation events in the stationary and pedaling states, with and without the seatpost shock absorber.
A total of 39 individuals were recruited (29 men and 10 women). As the amount of oscillation increased from an average of 0.7g (acceleration due to Earth's gravity) to 1.3g, the perineal pressure increased from 10.3% over baseline to 19.4% over baseline. There was a strong linear relationship between the amount of oscillation and increase in pressure (r = 0.8, P < .001). A seatpost shock absorber decreased the impact of oscillation by 53% in the stationary condition. Men and women absorbed the majority of shock in areas corresponding to pelvic bony landmarks.
This study represents one of the first characterizations of cycling-associated perineal micro-trauma in a laboratory setting. We found a strong linear relationship between oscillation magnitude and perineal pressure during cycling, which was mitigated by a seatpost shock absorber. The use of shock absorption in bicycle design may reduce perineal micro-trauma and potentially improve cycling-associated perineal numbness and erectile dysfunction. Sanford T, Gadzinski AJ, Gaither T, et al. Effect of Oscillation on Perineal Pressure in Cyclists: Implications for Micro-Trauma. Sex Med 2018;6:239-247.
骑自行车者的生殖器麻木和勃起功能障碍可能是由于日常骑行过程中，会阴反复受到自行车座垫的撞击（微创伤）所致。
在模拟实验室环境中评估骑自行车者的振荡力与会阴压力之间的关系。
让参与者骑上研究用自行车，以确保所有骑车者的躯干角度相同（60±1度）且最大膝关节角度相同（150±1度）。使用杠杆系统产生3种幅度逐渐增加的振荡事件。使用安装在自行车座垫上的压力传感器持续测量会阴压力。在以下每种条件下进行此过程：（1）使用标准座杆静止（不踩踏板），（2）使用标准座杆踩踏板，（3）使用座杆减震器静止，（4）使用座杆减震器踩踏板。
共招募了39人（29名男性和10名女性）。随着振荡量从平均0.7g（地球引力引起的加速度）增加到1.3g，会阴压力从基线以上增加10.3%增加到基线以上19.4%。振荡量与压力增加之间存在很强的线性关系（r = 0.8，P <.001）。座杆减震器在静止状态下将振荡的影响降低了53%。男性和女性在与骨盆骨性标志相对应的区域吸收了大部分冲击。
本研究是在实验室环境中对与骑行相关的会阴微创伤进行的首批特征描述之一。我们发现骑行过程中振荡幅度与会阴压力之间存在很强的线性关系，座杆减震器可减轻这种关系。在自行车设计中使用减震装置可能会减少会阴微创伤，并有可能改善与骑行相关的会阴麻木和勃起功能障碍。桑福德T、加津斯基AJ、盖瑟T等人。振荡对骑自行车者会阴压力的影响：对微创伤的影响。性医学2018；6：239 - 247。
