ALLERGY, RESPIRATORY
Herbal Remedy Could Halt Peanut Allergy
Know Your Asthma Triggers
Overweight Moms More Likely to Have Asthmatic Kids
ALTERNATIVE MEDICINE
Higher Vitamin D Intake Could Cut Cancer Risk
Soybean Chemicals May Reduce Effects of Menopause
Uncover Why Turmeric Helps You Heal
ANIMAL CARE
'Comfort Dogs' Come to Emotional Rescue
Beware of Dog Bites
Safe Toys for Dogs
BONES & JOINTS
Fractures in Older Adults Up Death Risk
Brazilian Mint Tea Naturally Good for Pain Relief
Scientists Discover How Osteoarthritis Destroys Cartilage
CANCER
To Quit Smoking, Try Logging On
Vitamin D Good for Breast Cancer Patients
Vitamin C Shows Promise as Cancer Treatment
CAREGIVING
Rapid Infant Weight Gain Linked to Childhood Obesity
Study Links Pesticides to Birth Defects
Timing May Matter in Organ Donation Decisions
CIRCULATORY SYSTEM
Secondhand Smoke Quickly Affects Blood Vessels
Walk 100 Steps a Minute for 'Moderate' Exercise
Salt Boosts Blood Pressure in High-Risk Patients
COSMETIC
Gum Chewing May Cut Craving for Snacks
Study Evaluates Laser Therapies for Hair Removal
Contact Lenses Boost Kids' Self-Image
DENTAL, ORAL
Mom's Vitamin D Levels Affect Baby's Dental Health
Rheumatoid Arthritis May Harm Gums
Sports Drinks May Be Tough on Teeth
DIABETES
Abnormal Heart Rhythm Boosts Death Risk for Diabetics
Exercise Protects Black Women From Type 2 Diabetes
Older Diabetics With Depression Face Higher Death Rate
DIET, NUTRITION
Imagine Food Aromas That Prevent Overeating
An Apple a Day May Help Keep Heart Disease Away
Many Kids Don't Need the Vitamins They're Taking
DISABILITIES
Review Finds Marijuana May Help MS Patients
Could Your Cell Phone Help Shield You From Alzheimer's?
ENVIRONMENTAL HEALTH
Exhaust From Railroad Diesel Linked to Lung Ailments
As Earth Warms, Lyme Disease Could Flourish
Topical Drugs May Pollute Waterways
EYE CARE, VISION
Brain Pressure More Likely to Cause Vision Loss in Men
Eye Disease, Cognitive Decline Linked in Study
Blood Sugar Control Helps Diabetics Preserve Sight
FITNESS
Daily Exercise at School Yields Rewards
Moderate Aerobic Exercise Lowers Diabetics' Liver Fat
Will the Wii Keep You Fit?
GASTROINTESTINAL PROBLEMS
HRT Use Raises Risk of Stomach Trouble
Gum Chewing May Speed Colon Surgery Recovery
Japanese Herbals May Ease Gastro Woes
GENERAL HEALTH
Heal Your LifeŽ Tips for Living Well
Week of Historic Senate Hearings on Integrative Medicine May Open New Doors
Dry Weather Boosts Odds of Flu Outbreaks
HEAD & NECK
Many Children Will Outgrow Headaches
Ski Helmets Encouraged for All
Zen May Thicken Brain, Thwart Pain
HEALTH & TECHNOLOGY
Magnet Therapy May Ease Hard-to-Treat Depression
'Cell Phone Elbow' -- A New Ill for the Wired Age
The Internet Is Becoming One-Stop Shopping for Health Help
HEARING
Noise Hurts Men's Hearing More, Study Shows
Summer Sounds Can Lead to Hearing Loss
HEART & CARDIOVASCULAR
A Little Alcohol May Help the Heart: Studies
Soy Protein Doesn't Lower Cholesterol
Fish Oil Supplements Help With Heart Failure
INFECTIOUS DISEASE
Bacterial Infections May Succumb to Honey
Swine Flu Is Now a Pandemic Says W.H.O.
Poor Restroom Cleaning Causes Cruise-Ship Sickness
INFERTILITY
Obesity May Affect Fertility in Young Womene
KID'S HEALTH
Keep Safety in Mind While Your Kids Are Cooling Off in the Water
Frequent Feedings May Be Making Babies Fat
Should Your Child Be Seeing a Chiropractor?
MEN'S HEALTH
Countdown to Hair Loss
Lots of Sex May Prevent Erectile Dysfunction
Soy Linked to Low Sperm Count
MENTAL HEALTH
Massage Fosters Healing in Bereaved Relatives
Meditation, Yoga Might Switch Off Stress Genes
Fear Response May Stem From Protein in Brain
PAIN
Tai Chi May Help Ease Fibromyalgia
Alleviating Rheumatoid Arthritis
Are We Exercising Pain Away? Not So Much.
PHYSICAL THERAPY
PREGNANCY
Woman in America Are Delaying Motherhood, Study Says
Pre-Pregnancy Weight Linked to Babies' Heart Problems
Before Conceiving, Take Folic Acid for One Full Year
SENIORS
Common Antioxidant Might Slow Parkinson's
For Older Walkers, Faster Is Better
The Juice From Beetroots May Boost Stamina
SEXUAL HEALTH
SLEEP DISORDERS
Daylight Savings: Not a Bright Time for All
Lose Weight, Sleep Apnea May Improve
Pay Attention to Signs That Say You're Too Fatigued to Drive
WOMEN'S HEALTH
Iodine in Prenatal Vitamins Varies Widely
Exercise, Weight Control May Keep Fibromyalgia at Bay
Exercise Boosts Bone Density in Breast-Feeding Moms
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Weak Muscles May Cause 'Runner's Knee'

(HealthDay News) -- Weak muscles may be the cause of the painful and debilitating condition known as "runner's knee," new research suggests.

People who develop the condition tend to have "weaker quads and hamstrings," study co-author Darin Padua, said in a news release. "As a result, they don't bend their knees as much when doing tasks, such as running or jumping. That means the contact area between the kneecap and the femur is smaller, so pressure is focused and pinpointed on a smaller area."

That, in turn, leads to runner's knee, also known as patellofemoral pain syndrome, said Padua, an associate professor of exercise and sport science at the University of North Carolina at Chapel Hill. Runner's knee, which affects an estimated one in four people who are physically active, can lead to osteoarthritis.

The research appears to be the first of its kind to study athletes both before and after they develop runner's knee, Padua said.

The researchers studied nearly 1,600 midshipmen from the U.S. Naval Academy. Of those, 40 people -- 24 women and 16 men -- developed runner's knee over several years.

The study authors noted that those with weaker hamstring and quadriceps muscles, a larger "navicular drop" (flattening of arches in the foot) and less flexible knees were several times more likely to develop the condition.

The findings appear in the November issue of the American Journal of Sports Medicine.

SOURCES: University of North Carolina at Chapel Hill, news release, Nov. 23, 2009 Published on: December 01, 2009