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Sitting and prostate health

Every sixth man in the western world gets prostate cancer. About one of the six dies of it. Vast majority of men (over 90 %) have enlarged prostates at the age of 60. Large number of men use medication that prevents prostate enlargement. Practically all senior men have slower urination because the prostate has grown. The urethra goes through the prostate. When the prostate grows the passage gets smaller and the urinating slows down.

So far there has not been any convincing evidence, or rational explanation or theory, about why the prostate grows and kills a lot of men. In physiology the interactions are surely very complex. Many factors have various effects and their precise interaction usually remains a mystery even to the best of scholars.

Now there is a new promising theory about what irritates the prostate: traditional sitting. This is very understandable and logical. When sitting on traditional chairs the weight of the upper body, which can be considerable, presses the pelvis. Also we sit for longer periods of time, and men are also heavier than before.

The process goes like this

  1. When men are sitting, the sitting bones (ischial tuberosities) sink in the padding, and the padding presses soft tissues (skin, fat, muscles) between the sitting bones through the pelvic opening into the lower pelvic area.
  2. A pressure field builds up in the lower pelvic area and the pressure spreads out in internal organs which include much more liquid than the body in average (67 %). We know that the pressure spreads out evenly in liquid.
  3. The increased pressure disturbs normal metabolism which, in time, cause dysfunctions and illnesses. 

The rational and indirect proofs of the theory that sitting increases prostate problems

  1. Men who stand more and whose work is physical have 23 % less prostate cancer than office workers.
  2. About 49 % of all cancers of men in Europe concentrate in the region between the sacrum, pubic bone and sitting bones (in an area the capacity of which is about one litre) where men have the prostate, bladder, urethra, anus, rectum, and part of the colon. As much as 70 % of all those cancers occur in the prostate.
  3. Men who have prostate infection feel pain on all seats, but considerably less on a two-part saddle seat where the gap prevents pressure from building up inside the pelvis.
  4. There is a growing number of men, whose already enlarged prostates have shrunk back, even down to 10–11 g level, after they have used a two-part saddle chair with about 40 mm wide gap under the pelvic opening. A volunteer who had a test history of 1998–2013 had prostate sizes of 11 g (1998), 18 g (2002), 16 g (2009), and 10 g (2013). The last was verified in two separate measurements with manual and Doppler ultrasound methods. Also the urinary organs were proven to be quite healthy without any indication of malfunction. The prostate, however, showed signs of earlier overgrowth on one side. During 2010–2013 the person sat on a saddle chair with a wider gap (40 mm) than ordinary saddle chairs. Also the count of live semen in his sperm was particularly high (291 million /mm³ of sperm) while the average was 48 million among 19-year-old men in 2013.
  5. The prostate is very close to the skin, just round the edge of the pubic bone, and thus gets a lot of sitting pressure.

Many risk factors have been found, or suspected, to increase prostate cancer. Sitting is a very promising candidate to be the main risk. Before the studies show the right order of the risk factors, it is smart to try to avoid them all and thus decrease the probability of this very unpleasant illness.

Read stories of Salli users related to this theme: Carpenter,  Entrepreneur

The statements on the page are based on the following sources:
Michael Adams, Nikolai Bogduk, Kim Burton, Patricia Dolan: The Biomechanics of Back Pain
David A. Rubenstein, Wei Yin, Mary D. Frame: Biofluid Mechanics, an Introduction to Fluid Mechanics, Macrocirculation, and Microcirculation
Marcus J. Seibel, Simon P. Robins, John P. Bilezikian: Dynamics of Bone and Cartilage Metabolism, Principles and Clinical Applications

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★ Reviews

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17 reviews
Great investment

The idea of being able to adjust the width of this saddle chair intrigued me and after some research I decided to try it. I found the chair was initially a little hard and my bottom would get sore, but after a few days of use I no longer noticed it. I have tried out a few different width settings now and I've found one suitable for me, being female and short. I feel it was a valuable purchase!

Thanks for the great review Julia. Sounds like after a short adjustment period (very normal) you are well on your way to happy healthy sitting! It keeps getting better too - enjoy!
Great Product

Very easy to install and now my Salli Saddle looks as good as new.

Thanks Ritesh, that's great to hear.
Excellent Chair

I purchased my Salli Swingfit 4 years after graduating dentistry as I was having some upper and lower back issues and could feel that my posture was poor at work. My only regret is not having purchased the chair sooner to prevent these issues from arising in the first place! It is a very comfortable chair and of high quality. Since purchasing the chair I have also fallen pregnant and I think working pregnant would have been even more uncomfortable if I did not have this chair and I have been able to work up until almost full term without any issues. I highly recommend the Salli products and I have also been impressed with the customer service and with how quickly my chair arrived. Thanks Salli Team and David!

Awww thanks for the review and kind words! We have heard from several pregnant ladies that it has really helped them due to the sitting position. Glad you found us - better late than never!
Salli Frankenbomber
Salli saved my career

I have a bad back fracture line l4 l5 cervical spondylitis . I had a lot of trouble as you would assume and looked at my options. Used the bambach chair ,a very well built chair but extremely heavy and cumbersome. I got a salli the very basic version in 2012 and have said goodbye to lower back troubles. This new on I just got has the new wheels i a treat to use. i will be ordering the new wheels for the older chair as well . Highly recommend to anyone working dentist technicians .

Fantastic to hear Gaurav! Thanks for the amazing review. When we tell people Salli can change your life it is stories like yours that confirm it - and makes us feel fantastic about what we do.

Salli Chin