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Division of Applied Research and Technology, National Institute for Occupational Safety and Health, Cincinnati, OH, USA
Division of Applied Research and Technology, National Institute for Occupational Safety and Health, Cincinnati, OH, USA
Division of Applied Research and Technology, National Institute for Occupational Safety and Health, Cincinnati, OH, USA
Steven M Schrader, PhD, NIOSH C‐23, 4676 Columbia Parkway, Cincinnati, OH 45226, USA. Tel: (513) 533‐8210; Fax: (513) 533‐8210; E‐mail: sms4@cdc.gov
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Introduction. The average bicycle police officer spends 24 hours a week on his bicycle and previous studies have shown riding a bicycle with a traditional (nosed) saddle has been associated with urogenital paresthesia and sexual dysfunction.
Aim. The objective of this study was to assess the effectiveness of the no‐nose bicycle saddle as an ergonomic intervention and their acceptance among male bicycle police officers.
Methods. Bicycle police officers from five U.S. metropolitan areas were recruited for this study. Officers completed: (i) the International Index of Erectile Function Questionnaire (IIEF); (ii) computerized pressure measurements at the points of contact on the bicycle; the handlebars, the pedals, and the saddle; (iii) one night of nocturnal Rigiscan® assessment; (iv) penile vibrotactile sensitivity threshold assessed by computerized biothesiometery. Officers selected a no‐nose saddle for their bicycles and were asked to use the intervention saddle exclusively for 6 months, at which point they were retested.
Main Outcome Measures. Perineal pressure, urogenital numbness, penile vibrotactile sensitivity threshold, erectile function as measure by International Index of Erectile Function Questionnaire (IIEF) and Rigiscan.
Results. After 6 months, 90 men were reassessed. Only three men had returned to a traditional saddle. The results are presented for those who used the no‐nose saddle continuously for 6 months. There was a 66% reduction in saddle contact pressure in the perineal region (P < 0.001). There was a significant improvement in penis tactile sensation (P = 0.015). There was a significant improvement in erectile function assessed by IIEF (P = 0.015). There were no changes noted in the Rigiscan® measures. The number of men indicating they had not experienced urogential paresthesia while cycling for the preceding 6 months, rose from 27% to 82% using no‐nose saddles.
Conclusions. (i) With few exceptions, bicycle police officers were able to effectively use no‐nose saddles in their police work. (ii) Use of no‐nose saddles reduced most perineal pressure. (iii) Penile health improved after 6 month using no‐nose saddles as measured by biothesiometry and IIEF. There was no improvement in Rigiscan® measure after 6 months of using no nose saddles, suggesting that a longer recovery time may be needed. Schrader SM, Breitenstein MJ, and Lowe BD. Cutting off the nose to save the penis. J Sex Med 2008;5:1932–1940.
Much of the biomedical community has reached a consensus about the association between erectile dysfunction and bicycle saddles [1, 2] and yet this association is often rejected in popular press bicycling magazines and Internet blogs. The etiology of this condition has been linked to both nerve entrapment [3-6] and vascular occlusion [7-10] In 2002, we reported the effects of bicycling on nocturnal erections in bicycle police officers [11]. One of our recommendations to the police officers was to consider a bicycle saddle without a protruding nose (no‐nose saddles; often referred to as noseless saddles) [12, 13]. Studies have shown that no‐nose saddles result in significantly less restriction in penile blood flow compared to traditional saddles [7, 14] and saddles with cutouts or splits [15]. Police officers expressed three concerns about using no‐nose saddles. First there was a concern that more pressure would be exerted on the hands of a cyclist using a no‐nose saddle causing hand or wrist problems. Lowe et al [16] reported that perineal pressure was reduced without a significant increase in hand pressure in police and public safety bicycling officers while using no‐nose saddles compared to a traditional nosed saddle. Another police officer concern was the possibility of blunt trauma injuries without the saddle nose holding him away from the bicycle top‐tube bar. Many police officers expressed a concern about bicycle handling using no‐nose saddles and thus whether no‐nose saddles could be used in the duties of bicycle officers. In the present study no‐nose saddles were provided to bicycle police officers to evaluate their effectiveness as an ergonomic intervention to alleviate the pernineal pressure, urogenital numbness, penile sensation, decreased penile erectile function, and collected data on the potential groin injuries due to sliding off the no‐nose saddle. Results of this intervention study are reported here.
The study protocol was reviewed and approved by the Human Subjects Review Board at the Centers for Disease Control and Prevention (CDC), National Institute for Occupational Safety and Health, prior to the initiation of the study.
The study was conducted in five major U.S. metropolitan areas recruiting a total of 121 bicycling police officers. During the first site visit to each location, a brief overview of the study, including the rationale and goals, was presented to each shift of bicycle patrol officers during their normal roll call or daily briefing. The men then, in private, decided whether or not to participate. Study participants signed informed consent forms and were enrolled into the study.
Each enrolled officer completed a work and health questionnaire which included the International Index of Erectile Function Questionnaire (IIEF) [17].
Saddle pressure was measured for each officer riding his duty bicycle using his pre‐study (nosed) saddle. Using a custom‐fabricated pressure sensing mat (Pliance, Novel Electronics, St. Paul, MN) contact pressure between the cyclist and saddle was characterized over each saddle as a whole and over a spatial region of each saddle corresponding to the cyclist's perineum. Saddle pressure was measured for 3–5 minutes of road cycling and 30 seconds in a stationary seated position while leaning against a wall or other solid object for balance. The road cycling measurements were taken with the officers using the data logger fit into a small backpack in order for the officer to cycle in his normal riding conditions. This cycling intensity was intended to simulate a typical patrol “cruising” intensity. The pressure‐sensing mat was constructed with 234 sensors (a 16 × 16 matrix with tapered corners) of 1.875 cm × 1.875 cm dimensions. Based on previous work (Lowe et al.) [16] our approach assumes that the ischial tuberosities, or descending ischial rami, correspond to the two local maxima that are observed in the saddle pressure profile. We infer that the perineal region of the cyclist lies in the region anterior to these pressure maxima and is relatively narrow in width. The perineal region is identified along the centerline of the segment running perpendicularly, midway between the clearly identifiable pressure maxima under the ischia. The spatial resolution for the calculation of pressure in this region is limited by the sensor system (square sensors of 1.875 cm width). We chose a width of three sensors (5.625 cm) over which to calculate this regional pressure. The length of this segment runs to the front of the sensor mat. Pressure in this perineal region is calculated by averaging the pressure levels of all sensors registering non‐zero pressure. Our belief is that, currently, no feasible technology or protocol exists, for a moving cyclist, to discriminate and remove all pressure created by the inner/posterior regions of the thigh from the derivation of a measure of contact pressure affecting the soft tissues of the perineum [16]. Recent works by Sauer et al. [18] and Bressel et al. [10], using optical motion capture and magnetic resonance imagery (MRI), respectively, have spatially referenced the location of the distribution of saddle pressure with respect to anatomic structures of the pelvis and within the urogenital tract. However, these innovative approaches are obviously infeasible in a road cycling situation as was the present study.
Hand and foot force were calculated based on pressure measured with the Novel Pedar foot insole sensors. The left insole was worn in the subject's shoe in its intended use and the right foot insole was wrapped around the grip area of the left handlebar under the subject's hand. These foot insole sensors were of the standard Novel design and have been described in previous work [16]. Average hand and foot force were calculated for the period of cycling and the period of static sitting on the saddle by averaging the total insole force in each frame (sampling interval) of the trial. Total insole force was calculated by multiplying each individual sensor pressure by the area of the sensor and summing over all sensors on the insole. As in our previous study, we have made the assumption that the left and right hand and foot create contact forces on the bicycle that are symmetric and have thus doubled both values to represent the total foot force and total hand force on the bicycle.
The Rigiscan® Plus (Timm Medical Technologies, Eden Prairie, MN) was used to assess erectile function during the normal sleep patterns of the participants [19, 20]. It is a computerized monitor worn on the leg, with two loops encircling the penis, one on the base the other on the tip, used to study the penis during sleep. Men have penile erections during sleep which provide useful physiologic information on erectile capability [21]. For reliable results the participants were asked not to ejaculate for 1 day before the test, not to drink coffee, tea, caffeinated soft drinks, or alcoholic beverages for 2 hours before bedtime, and not to take sedatives, tranquilizers, muscle relaxants, or sleeping pills the night of the test—all these have been linked with impaired sexual function. A brief self administered questionnaire was completed after Rigiscan® Plus use. These questions were used to verify compliance to these pre‐conditions and gathered information on the number of hours biking the previous day and the quality of their sleep. The variable number of sleep time erections, measured by the Rigiscan® Plus, is an assessment of the physiological ability to have a nocturnal erection. The variable percentage of sleep time an erection occurred is an indicator of erection quality. It is noted that Rigiscan measurements do not necessarily correlate with axial rigidity [22] and no measures of axial rigidity were evaluated in this study.
Vibrotactile sensitivity thresholds of the finger and penis were conducted using a computerized biothesiometer (Neuro Sensory Analyzer VSA‐3000, Medoc Ltd, Israel) according to the manufacturer's instructions. Briefly, a clean sterile trough was placed on the vibratory probe. Two type of stimuli scenarios were tested—first stimuli increase in intensity until a sensation is perceived, at which moment the stimulus is halted by the subject pressing a button. Then the vibratory stimulus is started at 12 microns and decreases. The subject presses the button when he can no longer perceive vibration. This was repeated three times. A reaction time artifact is built into this computerized measurement, due to the time lapse between the moment a sufficient energy has been administered to the stimulation site to eventually induce a sensation until the data reaches the brain, is processed, and a message is conducted to the signaling hand to press the switch. The biothesiometer was set up in a private restroom. The computer operator was in an adjoining room. The index finger of the left hand was first tested under supervision from the investigator. The finger was primarily tested to familiarize the participant with the study procedure with direct interaction with the investigator before the private testing of the penis. The testing of the finger also provided a gross overview of changes in hand numbness. The investigator then left the restroom and the door to the adjoining room was closed. The study participant adjusted the trough height and angle and put his penis into the trough (Figure 1). The computer operator spoke loud enough to be heard through the door while testing.
Following these baseline measurements, no‐nose saddles were provided to all of the study participants. The officers selected no‐nose saddles for their duty bicycles and for their personal bicycles and were asked to use only no‐nosed saddles for 6 months. They were allowed to try different no‐nose saddles to determine which was most comfortable. Bicycle fit adjustments for all saddles were made according to local police department fit guidelines. If during the 6 months their saddle needed replacement, a new one was provided to them.
After 6 months, a second site visit was conducted at each study location. Each officer again completed a work and health questionnaire which included the IIEF questionnaire, bicycle saddle pressure assessment, Rigiscan® Plus testing, and biothesiometry.
Across the five metropolitan areas, 121 bicycle police officers were recruited, 17 of these did not return for their 6‐month evaluation and their status on the use of no‐nose saddles is unknown. An additional 14 left the bicycle patrol during the 6‐month study period. Of the remaining 90 participants, only three had returned to their traditional saddles by the end of the study period. Due to the complexity of conducting a multi‐site study tracking and evaluating participants for 6 months and the malfunction of some equipment, varying number of participants completed both the pre‐ and posttests. The sample size (N) for each test is provided. Each man was compared with his original data while using a traditional (nosed) saddle and after using the no‐nose saddle for 6 months using a paired t‐test. Table 1 summarizes the results of the study. The average participant was 37 years old and had been riding in the bike patrol for 3 years. The average participant weighed approximately 215 lbs wearing his police gear. The average officer was actually on the bicycle about 24 hours per week (22.8 hours pre‐; 25.4 hours post‐; P = 0.19). Two officers reported they were being treated for hypertension throughout the study, six men indicated they were smokers throughout the study, and no other officers reported medical risk factors for erectile dysfunction.
International Index of Erectile Function Questionnaire score
Of the 85 participants answering the question, none experienced a blunt trauma to the groin area while using a no‐nose saddle.
When compared to the same man using his original traditional (nosed) saddle perineal pressure was significantly reduced (P < 0.0001) using a no‐nose saddle, both while riding the bicycle and while sitting stationary leaning against a wall. As an example, pressure distributions of the same officer using his traditional nosed saddle and his no‐nose saddle are presented in Figure 2.
Of the 77 men answering both the pre‐ and post‐numbness question, 73% of the officers indicated that they experienced numbness to the buttocks, scrotum or penis while using traditional saddles at the beginning of the study. After using no‐nose saddles for 6 months, only 18% indicated that they now experienced such numbness (Figure 3).
After using no‐nose saddles for 6 months, significant improvement (P = 0.015) was noted in erectile function when evaluated by the IIEF questionnaire from the beginning of the study (nosed‐saddle) to the end of the study (no‐nose saddle). Because a majority of men score a perfect 30 on this questionnaire, Dinsmore et al. [23] used the percent of men scoring a 30 in the control group to compare to the treatment group. These data indicated that 86.1% of men in their control group (N = 109, age range 31–86) scored a 30 on the IIEF erectile function domain. In the current study 72.7% bicycle police officers scored a 30 while using the traditional saddles and this percentage rose to 84.9% after using no‐nose saddles for 6 months (Figure 4). This observed change is of little or no clinical diagnostic value but illustrates a population shift. Evaluating both the significant change in the average score of the IIEF and the percentage of perfect scores demonstrates the overall improvement in reported erectile quality from these men.
A significant improvement (P = 0.015) was observed in the vibrotactile sensitivity threshold of the penis from the baseline measurements to the measurements made after 6 months of use of the no‐nose saddle as measured by biothesiometry.
After using the no‐nose saddles for 6 months, no changes were observed in the number of nocturnal erections (P = 0.54) or the duration of time men were erect in their sleep (P = 0.92) over the baseline measurements. The average number of erections for both the beginning and end tests was four and the average duration of erectile activity was 24%.
There appears to be a slight but nonstatistically significant improvement (P = 0.086) in the sensitivity of the finger as measured by biothesiometry (the vibration test). It is apparent that the sensitivity of the finger was not harmed while using a no‐nose saddle for 6 months.
With the well documented association between the perineal pressure from the bicycle saddle and erectile function [1], the need for an ergonomic intervention that would alleviate the compression of the perineal area resulting from the nosed bicycle saddle during police patrol cycling became evident [2]. Cohen [24] provides a brief history of the bicycle in his recent book on bicycle fit. The bicycle saddle as the name implies was a modification of the horse saddle cut away for the free movement of the legs to pedal. Since the 1880s, there have been several adaptations to make the bicycle saddle comfortable. These include the addition of springs, foam, and cutting away parts of the nose. One of the obvious discomforts of traditional bicycle saddles was the male rider was sitting on his internal penis and the female rider was sitting on her external genitalia. To alleviate this discomfort the midline of the saddle nose was cutout. While these saddles improved comfort in both men [24] and women [25], it was soon discovered that pressure to the pudental nerves and vessels was not alleviated [2
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