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The "Data" on Nerve Damage (hand and pudendal) with Cycling(6 posts)

The "Data" on Nerve Damage (hand and pudendal) with CyclingMXL02
Oct 16, 2002 7:33 AM
There have been several threads on the above topic with lots of speculation on the veracity of these topics. The bottom line? Yes, if you place unremitting pressure on ANY area you can get damage...long enough and it will be irreversible. The bottom line- move your hands and your arse!

: Acta Neurol Scand 1997 Apr;95(4):233-40 Related Articles, Links

Impotence and nerve entrapment in long distance amateur cyclists.

Andersen KV, Bovim G.

Laboratory of Clinical Neurophysiology, Trondheim University Hospital, Norway.

OBJECTIVES: To assess the frequency and duration of symptoms suggesting peripheral nerve compression after long distance cycling. MATERIAL AND METHODS: A questionnaire based cross sectional study among 260 participants in a Norwegian annual bicycle touring race of 540 km. RESULTS: Thirty-five of 160 responding males (22%) reported symptoms from the innervation area of the pudendal or cavernous nerves. Thirty-three had penile numbness or hypaesthesia after the tour. In 10, the numbness lasted for more than one week. Impotence was reported by 21 (13%) of the males. It lasted for more than one week in 11, and for more than one month in three. Both genital numbness and impotence were correlated with weakness in the hands after the ride, a complaint reported by 32 (19%) of all 169 respondents. Forty-six cyclists (30%) indicated paraesthesia or numbness in the fingers, half of them from the ulnar nerve area only. CONCLUSION: The frequency of impotence, numbness of the penis, hand weakness and sensory symptoms from the fingers in bicycle sport may be higher than hitherto recognized. It afflicts both experienced cyclists and novices. In some, the complaints may last up to eight months. Besides changing the hand and body position on the bike, restricting the training intensity, and taking ample pauses may also be necessary in prolonged and vigorous bicycle riding to prevent damage to peripheral nerves.
And anotherMXL02
Oct 16, 2002 7:35 AM
Clin Exp Neurol 1991;28:191-6 Related Articles, Links

Bicycling induced pudendal nerve pressure neuropathy.

Silbert PL, Dunne JW, Edis RH, Stewart-Wynne EG.

Department of Neurology, Royal Perth Hospital.

Pudendal neuropathies are well recognised as part of more generalised peripheral neuropathies; however, focal abnormalities of the pudendal nerve due to cycling-related injuries have been infrequently reported. We describe two patients who developed pudendal neuropathies secondary to pressure effects on the perineum from racing-bicycle saddles. Both were male competitive athletes, one of whom developed recurrent numbness of the penis and scrotum after prolonged cycling; the other developed numbness of the penis, an altered sensation of ejaculation, with disturbance of micturition and reduced awareness of defecation. Both patients improved with alterations in saddle position and riding techniques. We conclude that pudendal nerve pressure neuropathy can result from prolonged cycling, particularly when using a poor riding technique.
Cycling and penile oxygen pressure: the type of saddle matters.

Schwarzer U, Sommer F, Klotz T, Cremer C, Engelmann U.

Department of Urology, University Medical Center of Cologne, Germany.

OBJECTIVES: Temporary genital numbness is a common side effect of long-distance cycling; cases of impotence have even been reported. Recent reports have shown that perineal compression leads to a decrease in penile blood flow. Reduced oxygen tension leads to penile fibrosis, which works counterproductively to the achievement of an erection. The shape of the bicycle saddle could be a factor affecting penile perfusion. The aim of this study is to find out the influence of different saddle designs on penile perfusion. MATERIAL AND METHODS: In 20 healthy athletic young men (mean age 26.8 years, range 21-31 years) without history of erectile dysfunction, transcutaneous oxygen pressure (PtcO2), which correlates with arterial and tissue PO2, was measured at the glans of the penis using a transcutaneous measurement device. All men were measured in a standing position before cycling, then during cycling in a seated position on a stationary bicycle. Four different bike saddle designs were used: (A) narrow heavily padded seat; (B) narrow seat with medium padding and a V-shaped groove in the saddle nose ("body geometry"); (C) wide unpadded leather seat; (D) women's special wide seat with medium padding and no saddle nose. RESULTS: During cycling in all seats a decrease in penile oxygen pressure could be observed, reflecting perineal compression. But the differences were unexpected: seat (A) mean PtcO2 11.8 mmHg, decrease in initial oxygen pressure 82.4%; seat (B) mean PtcO2 20.8 mmHg, decrease in initial oxygen pressure 72.4%; seat (C) mean PtcO2 25.3 mmHg, decrease in initial oxygen pressure 63.6%; seat (D) mean PtcO2 62.3 mmHg, decrease in initial oxygen pressure 20.3%. CONCLUSIONS: Cycling in a seated position leads to a compression of perineal arteries with a consequent significant decrease in penile perfusion. But, there are unexpected differences between different saddle types. It was possible to demonstrate that the most important factor in safeguarding penile perfusion is not the amount of padding, but rather a saddle width which prevents sufficiently the compression of the perineal arteries.

: Int J Sports Med 2001 Aug;22(6):410-3 Related Articles, Links

Impotence and genital numbness in cyclists.

Sommer F, Konig D, Graft C, Schwarzer U, Bertram C, Klotz T, Engelmann U.

Department of Urology, University Medical Center of Cologne, Germany. Frank.Sommer@uni-koeln.de

Cyclists often complain of genital numbness and even of impotence. The purpose of this study was to determine if perineal compression during cycling causes changes in the penile blood supply, impotence and penile numbness. Forty healthy athletic men with a mean age of 30 +/- 5.3 years took part i
Compression of the arteries vs. nervefiltersweep
Oct 17, 2002 4:51 AM
Yeah... and sitting for hours during a long flight can lead to fatal blood clots for some individuals.

Let's see a control study of other athletes engaged in heavy cardio activity and see where the blood flows in general.

Let's see how the increased cardio capacity POSITIVELY affects overall blood circulation while NOT cycling.

All this study truly seems to prove is that sitting on a saddle is not the optimal position for having blood flowing through the penis. It is a huge leap to suggest that this leads to "penile fibrosis" unless an individual is predisposed to fibrosis by other general medical conditions (like diabetes). I strongly doubt anyone spends enough time on a bike for this to be a serious condition... we are not talking about completely cutting off the blood supply.
and MoreMXL02
Oct 16, 2002 7:38 AM
Erectile dysfunction in cyclists. Is there any difference in penile blood flow during cycling in an upright versus a reclining position?

Sommer F, Schwarzer U, Klotz T, Caspers HP, Haupt G, Engelmann U.

Department of Urology, University Medical Centre of Cologne, Germany. Frank.Sommer@uni-koeln.de

OBJECTIVE: Perineal compression during bicycling appears to be responsible for some cases of erectile dysfunction. MATERIAL AND METHODS: In 46 healthy athletic men transcutaneous penile oxygen pressure (tpO(2)) at the glands of the penis was measured, using a transcutaneous measurement device. It has been shown that the tpO(2) levels measured at the glans correlate with the penile blood flow. Our measurements were performed before, during and after cycling in an upright and a reclining position in a crossover study. RESULTS: The mean transcutaneous pO(2) at the glans in a standing position before biking was 60.5+/-8.1 mm Hg. It decreased after sitting on the saddle in an upright position to 17.9+/-3.9 mm Hg. Continued cycling in a seated upright position showed pO(2) levels of 18.3+/-5.2 mm Hg, with a full return to normal pO(2) values after a 10-min recovery period in a standing position. Cycling in a reclining position resulted in pO(2) levels of 59.4+/-4.2 mm Hg, a similar level to that obtained before exercising. CONCLUSIONS: The results of the present study demonstrated that there is a deficiency in penile perfusion caused by perineal arterial compression. Cycling in a reclining position - in which no perineal compression was seen - caused no alteration in penile blood flow during exercising. Therefore, we suggest cycling in a reclining position to avoid health hazards - such as penile numbness and hypoxygenation of the corpora cavernosa, which can result in impotency.
Lucky for me it has never happened to my "altogether." (nm)onespeed
Oct 16, 2002 7:39 AM
Amateur cyclistsfiltersweep
Oct 17, 2002 4:40 AM
Sorry, but if you know anything about stats, this "study" is seriously flawed.

What happened to the 100 cyclists who did NOT respond? There may well be a bias inherent in WHO responded (those prone to problems), but we will never know.

These were "amateurs." What does that mean? Does it mean they had poor fit, poor posture, less than optimal saddles?

13% impotent? Compared to WHAT? 13% of the non-cycling male population might be impotent as well (ever see all those Viagra commercials?).

Why did FEWER respondants report numbness lasting more than a week than reported impotence?