Yoga aids PSA levels

DEAR DR. ROACH: Five years ago, I added five to six minutes of easy yoga, mostly sitting exercises, to my daily exercise routine.

My PSA has gone down to the 0.9-1.1 range, from 4.3. This is for someone who has had two prostate biopsies through the years.

My doctor now says that the odds of me having prostate cancer are about 1,500 to 1. A few others who have started doing the exercises also have seen their PSA number drop.

ANSWER: I have two important comments about your story. The most significant is that there is pretty strong evidence that regular exercise, especially regular vigorous exercise (one study looked at men with at least three hours of vigorous exercise per week), decreases the risk of prostate cancer.

The magnitude of the effect varies depending on the study, from 31 per cent to almost 70 per cent. However, the effect you have seen in your PSA result is much better than usual: In a study on exercisers versus non-exercisers, the PSA dropped by 4 per cent in the exercise group (who had other lifestyle interventions as well), compared with an increase of 6 per cent in the control group. However, exercising right before getting your PSA drawn can lead to a spurious elevation in the result. This just has to do with the activity releasing premade PSA: Sexual activity can do this as well.

I’m also concerned that your doctor may have overstated the case somewhat. For men (average age of 65) with a low PSA, the rate of cancer is roughly 1 per 500 men per year. It’s certainly lower than those with high PSA, but it’s still possible to develop prostate cancer with a low PSA.

I am a big believer in the many beneficial effects of exercise, and reducing cancer risk is one more reason to exercise. Unfortunately, cancer still can happen, even to people who do everything possible to reduce risk.

DR. ROACH WRITES: A recent column on tinnitus generated some interest among readers. Several readers wrote that tinnitus associated with hearing loss can be made better with hearing aids.

I was asked about acupuncture and magnetic therapy, neither of which has strong evidence to support that it is better than placebo (more research is ongoing, with some promise).

Another person noted that a family member’s tinnitus went away after 100 pounds of weight loss: In that case, I suspect that the overweight person may have had elevated intracranial pressure (sometimes called “pseudotumor cerebri”), which is a rare cause of tinnitus.

Finally, some people noted that having background noise can “mask” the tinnitus.

As always, I appreciate the interest and helpful comments. You can reach me by email or on my Facebook page, facebook.com/keithroachmd.

Readers may email questions to ToYourGoodHealth@med.cornell.edu.