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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 08-10-07, 06:49 PM   #1
IROeunuch
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How come I always have to pee after riding my fixed gear bike?

Whenever I ride from school to home, I always have to tinkle first thing! My commute is 8 miles. I walk up a bunch of flights of stairs. By the time I get inside, I really really gotta pee. It is urgent. I don't have to go before I left. What gives?
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Old 08-10-07, 06:57 PM   #2
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prostate cancer
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Old 08-10-07, 06:57 PM   #3
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Have you rotofixed your cog? If you'd done a search first, you'd have found that a loose cog can cause incontinence.
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Old 08-10-07, 06:58 PM   #4
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Maybe your seat is giving you a UTI.
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Old 08-10-07, 07:00 PM   #5
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bward, wtf is going on in your signature image?
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Old 08-10-07, 07:08 PM   #6
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bward, wtf is going on in your signature image?
Its an illustration of how to use a tool to disembowel a dear.

As for peeing after riding, I dont know. Is it absolutely everytime? Do you drink lots of water prior to riding? Could be bladder issues. Id recommend talking to a doctor and not an internet forum if you are concerned about it.
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Old 08-10-07, 07:09 PM   #7
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What male over the age of 7 says "tinkle" when referring to peeing?

Az
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Old 08-10-07, 07:09 PM   #8
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bward, wtf is going on in your signature image?
http://www.cabelas.com/prod-1/0041414228322a.shtml

"For Sportsmen, By Sportsmen."

All i can say is, think of the taglines they rejected...
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Old 08-10-07, 07:23 PM   #9
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I usually forget that I have to go to the bathroom while I'm commuting. My bladder can be filled to the top before I get on my bike, but not long after I clip in I generally forget about having to go. Sucks when I finally get to my destination though.

Maybe you do the same thing and just have short term memory loss.
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Old 08-10-07, 07:34 PM   #10
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My guess is pressure on your perenium is causeing you to either:
1. not know you need to go while you're on the bike
2. feel like you really need to when you get off.

Tilt the nose your saddle down a little and see if that doesn't take care of it. Mister winkey doesn't feel numb when you're on the bike does he?
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Old 08-10-07, 07:43 PM   #11
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Mister winkey doesn't feel numb when you're on the bike does he?
I used to go numb after 30 mins. or more in the saddle before I got my Brooks. Being supported by my sit bones more than my perenium has helped immeasurably.
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Old 08-10-07, 07:46 PM   #12
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you have probably peed after getting home several times so your body is now anticipating your arrival. try holding it a few more minutes and see if you actually have to go or if your body is just tricking you
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Old 08-10-07, 08:08 PM   #13
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make sure you're not using a JIS crank on an ISO spindle, and for god's sake, man, don't put grease on it.
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Old 08-10-07, 11:03 PM   #14
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I think it has something to do with the parasympathetic nervous response. When you get your adrenaline flowing the parasympathetic response starts and it causes you to retain more water, thus reducing the impulse to urinate. Once you get home and off the bike, you relax the adrenaline flow and other hormones involved in the parasymp. will allow your urination impulse to return.

I think it would be really interesting to see how this phenomena would be affected if you had a really bad ride where every driver seemed to be pissed at your presence. But when you came home, instead of just doing your thing and relaxing, all your friends were over and we're all riled up to go riding and excited to do whatever. I wonder if your emotional and hormonal response would continue to supress the urge to piss if you went from extreme anger(from drivers and the ride) to extreme elation( from friends and excitation)? Or would you be like "Ahh, guys I really gotta piss, give me a minute".

I get carried away sometimes when it comes to situational psychophysiology.
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Old 08-11-07, 02:06 AM   #15
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Situational psychophysiology... my new favourite word.
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Old 08-11-07, 06:58 AM   #16
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I think it has something to do with the parasympathetic nervous response. When you get your adrenaline flowing the parasympathetic response starts and it causes you to retain more water, thus reducing the impulse to urinate. Once you get home and off the bike, you relax the adrenaline flow and other hormones involved in the parasymp. will allow your urination impulse to return.

I think it would be really interesting to see how this phenomena would be affected if you had a really bad ride where every driver seemed to be pissed at your presence. But when you came home, instead of just doing your thing and relaxing, all your friends were over and we're all riled up to go riding and excited to do whatever. I wonder if your emotional and hormonal response would continue to supress the urge to piss if you went from extreme anger(from drivers and the ride) to extreme elation( from friends and excitation)? Or would you be like "Ahh, guys I really gotta piss, give me a minute".

I get carried away sometimes when it comes to situational psychophysiology.
Jakbikesdc - You're right about all of this, but the terminology is a little off -
The sympathetic nervous system (not the parasympathetic) acts to inhibit urination. To do so, it releases adrenaline (just like you said).
Meanwhile, the parasympathetic nervous system acts to stimulate urination, using acetylcholine to do so.
They're both part of the autonomic nervous system, and it's easy to get the names confused.
So the story should go something like this -
While riding, your sympathetic system is activated, inhibiting urination. When you get home, the adrenaline wears off, allowing the sympathetic to stimulate urination.
But all your friends are over (how DID they get in your house?) so you're all excited - this would involve the sympathetics again, which would go back to inhibiting the urge to piss.
I'm not trying to be a jerk, I'm just a dork. Who happens to be reviewing physio at the moment. Which means that by posting this, I'm technically studying. AWESOME.
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Old 08-11-07, 07:55 AM   #17
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Don't listen to these quacks-- your cog is loose!
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Old 08-11-07, 08:14 AM   #18
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While riding, your sympathetic system is activated, inhibiting urination. When you get home, the adrenaline wears off, allowing the parasympathetic to stimulate urination.
slight correction above. just as a note: as best i can remember, both systems do this by affecting the detrusor muscle of the bladder.
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Old 08-11-07, 08:56 AM   #19
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Thanks shants, that was a pretty bad typo.
& you're totally right, they both act on the detrussor (symp. inhibit the detrussor, while para stimulate it). They also act on the bladder sphincters (symp. contract the internal sphincter, while para relaxes the external sphincter).
The ANS is pretty rad.
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Old 08-11-07, 09:01 AM   #20
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Originally Posted by hockeyteeth
Being supported by my sit bones more than my perenium has helped immeasurably.
Understandably so, especially if your sit bones bring more in take-home pay than your perenium, which I assume is the case.
I mean, really, have you heard of a perenium making good money? Of course not.
I commend you in your ability to live with your sit bones as your sugar daddy. No need to mention the utter and total embarrassment of being the sugar recipient of a perenium ...
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Old 08-11-07, 09:38 AM   #21
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Have you rotofixed your cog? If you'd done a search first, you'd have found that a loose cog can cause incontinence.
i think you meant to say incoGtinence.
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Old 08-11-07, 09:50 AM   #22
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I always get the urge to pee when I sit down to read a book or a magazine at a store. Must mean my chain needs degreasing, eh?
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Old 08-11-07, 12:36 PM   #23
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Whenever I ride from school to home, I always have to tinkle first thing! My commute is 8 miles. I walk up a bunch of flights of stairs. By the time I get inside, I really really gotta pee. It is urgent. I don't have to go before I left. What gives?
Does this commute involve stopping at a bar for a few beers?
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Old 08-11-07, 01:22 PM   #24
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riser bars and ourys I KNEW IT
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Old 08-11-07, 02:37 PM   #25
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This forum's understanding of certain parts of the human anatomy is quite amazing. Now I'm scared.

The solution probably does lie in your saddle angle or choice of saddle overall, but I won't contribute further.

Except to say that if you can't find a medical solution, check your bike out and immediately replace any component without an NJS stamp. Keirin racers don't have to urinate right after racing, so it must be the NJS certification.

Thanks folks, you really made my day.
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