This may help to explain the relatively high injury rates for the uninvolved limb in athletes who have returned to sport following anterior cruciate ligament reconstruction.Īnterior cruciate ligament (ACL) tears are common among young athletes who compete in sports that involved frequent landing and jumping, such as basketball. The athletes in this study consistently applied higher and more rapid loads to their uninvolved limb over multiple land-and-jump cycles. Impact forces, loading rates, and propulsive forces were higher for the uninvolved limb, compared to the involved limb, over the five land-and-jump cycles analyzed. There was not a limb-by-cycle interaction effect or main effect of cycle for the impact forces, loading rates, or propulsive forces however, there was a main effect of limb for the impact forces (F(1, 8) = 14.64 p=0.005), loading rates (F(1, 8) = 5.60 p=0.046), and propulsive forces (F(1, 8) = 10.38 p=0.012). Two-way analysis of variance, for within-subjects factors of limb and cycle, was performed for the impact forces, loading rates, and propulsive forces from the first five land-and-jump cycles completed. Athletes performed a repetitive tuck jump task for 10 seconds, while ground reaction forces were recorded for their uninvolved and involved limbs via separate force platforms. All participants had undergone successful unilateral anterior cruciate ligament reconstruction, had completed post-operative rehabilitation, and were in the process of completing return-to-sport testing. Nine athletes (four males, five females) participated in this study. The purpose of this study was to examine bilateral landing and jumping kinetics during performance of a repetitive tuck jump task in athletes who had undergone anterior cruciate ligament reconstruction and completed rehabilitation. However, previous studies have only examined forces and loading rates for tasks involving an isolated land-and-jump.

their limb that underwent reconstruction), which may place their uninvolved limb at risk for injury.

Tucker.Athletes who have undergone anterior cruciate ligament reconstruction typically exhibit relatively high/rapid loading of their uninvolved limb during bilateral landing and jumping (vs.

In addition, keep in mind, as women age it's more and more difficult to improve bone density.” Note: the study did not include women with osteoporosis hopping may not be recommended in these cases, says Dr. “Women have to do the jumps daily to get the benefits. “Our study showed significant benefits over time,” says Dr. This new study shows a way to keep bones strong throughout life. To make matters worse, as we age we’re less likely to perform high-impact, bone-building activities. Five to seven years after menopause women may lose up to 20% or more bone density. Peak bone mass happens around age 25 and then declines. What it means: Although bone density increases most rapidly during adolescence, the process slows with age. Doesn't sound like a lot of gain? Consider this: the controls lost about 1.3% of their bone density over the same period. “Women jumped as high as they could from the floor,” says lead study researcher Larry Tucker, PhD. 5% by jumping 10 times a day, twice a day and taking short breaks (30 seconds) between each jump. The research: Sixty premenopausal women, ages 25 to 50, significantly increased their hip bone bone mineral density after four months by. The claim: Jumping 10 times a day twice a day provides greater bone-building benefits than running or jogging, reports a study in the American Journal of Health Promotion.

20 tuck jumps