Exercise & Fitness Archive

Research suggests benefits for a range of cardiovascular conditions.

Q . Can you explain exactly what "ejection fraction" means? And is there any way to increase it?

A. Ejection fraction refers to the volume of blood that's pumped out of the heart's left ventricle each time it contracts. Contrary to what many people believe, a normal ejection fraction is not 100%. Even a healthy heart pumps out only about half to two-thirds of the volume of blood in the chamber in one heartbeat. So a normal ejection fraction lies somewhere in the range of 55% to 65%.

New findings may help allay fears about sports-related heart death.

Unless you have symptoms of a heart problem, taking a cautionary look under the hood is unlikely to help—and could even be harmful.

Q. Should I stretch before or after my workout to help prevent muscle injuries and soreness? I've gotten conflicting advice on this.

A. We all remember the importance placed on stretching in our high school physical education classes. However, recent expert opinion has moved away from static stretching before activity and toward a gradual and active warm-up period before exercise. Stretching a healthy muscle before exercise does not prevent injury or soreness.

Physical therapy is helpful for wear-and-tear knee osteoarthritis, especially if you start doing it early. But injecting a painful knee with an anti-inflammatory steroid medication before starting physical therapy offers no additional benefit, according to a clinical trial in JAMA Internal Medicine.

Studies have shown that physical therapy modestly reduces pain and improves daily functioning in people with knee osteoarthritis. That could mean being able to walk farther with less pain or to continue leisure activities such as gardening. Before you start physical therapy, your doctor may offer to inject the knee with a cocktail of anti-inflammatory steroid medication and an anesthetic. Hypothetically, this could make it easier for you to stick with exercise and therefore lead to better results.

Q. I have sciatica. I also have vertebral fractures caused by osteoporosis. I'd like to get physical therapy for my sciatica but am worried about damaging my spine further. What do you advise?

A. I am glad that you are interested in pursuing physical therapy to treat the sciatica. It's the best treatment for it. The physical therapist is likely to show you how to do gentle stretching exercises for your upper legs, buttocks, and back, as well as how to use your back, core, and legs more effectively to avoid worsening the strain on your sciatic nerve. She will also train you to do exercises to strengthen your back and core. None of these maneuvers will damage the bones in your back. But it's important for you to tell the therapist that you do have osteoporosis and vertebral fractures. She will keep that in mind as she works with you.

Men who want to live longer would be wise to remain physically active as long as possible, according to a long-term study of aging in older men reported in the British Journal of Sports Medicine.

In 1972–73, the Oslo Study recruited nearly 15,000 Norwegian men ages 40 to 49. In 2000, the surviving participants filled out a survey about their daily physical activities. This included everything from couch-potato time in front of the TV to vigorous athletic workouts several times a week.

High levels of these fatty particles in the blood means you may need to step up healthy lifestyle changes.

Here's how to get the most out of physical therapy and cardiac rehab.