Adarq.org
Performance Area => Peer Reviewed Studies Discussion => Topic started by: adarqui on March 19, 2010, 06:43:10 am
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Post studies regarding long jump, triple jump etc.
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x. Mineral mass, size, and estimated mechanical strength of triple jumpers'' lower limb Bone
This study was designed to examine the anticipated strong influence of extreme impact loading on the mineral mass, size, and gross structural properties of triple jumpers’ lower limb bones. We compared the bone data obtained with peripheral quantitative computed tomography (pQCT) and dual-energy X-ray absorptiometry (DXA) from 8 Finnish triple jumpers with corresponding data from gender-, age-, height-, and weight-matched nonathletic peers. The volumetric (trabecular) density was significantly higher in the jumpers than in controls (from an average 18% difference at the distal tibia to a 41% difference at the proximal tibia), whereas the cortical density did not differ between groups. The DXA-derived areal bone mineral density of the femoral neck and lumbar spine was 31% higher in the jumpers than in controls, compared with a 16% difference between groups at the less-loaded distal radius. The lower limb bones were comparable in size between groups except at the distal femur where a significant 4%–6% difference was observed in favor of the triple jumpers. Mean tibial cortical wall thickness and area were substantially greater in the triple jumpers; the mean group difference ranged from about 20% at the shaft sites, to over 50% at the distal tibia. Given the apparently stronger cortices in the triple jumpers, the section moduli (bone strength index) of their femoral necks and tibiae were 19%–31% higher compared with the control group. Our findings indicate the ability of extreme impact loading to considerably improve bone’s mechanical competence. Adaptation to loading seems to occur in a site-specific fashion by gross geometric changes, structural or architectural changes, or by their combination. The loading effect was best seen as enlarged bone cortices, probably after the trabecular density had reached its ceiling.
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I read this study fairly recently, it has some pretty awesome implications, like doing plyometrics to prevent osteoporosis for example could be one. We all know weightlifting improves bone mineral mass, but what about just sprinting running, and depth drops? Pretty cool.
When I first started training, I noticed I couldn't do a running 1 footed vertical because I felt like my shins would explode. I did drop jumps for like 2 weeks and the problem was fixed, so perhaps my bone density actually improved along with tendon stiffness, and other stuff... who knows.
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Bone density improving in two weeks? I don't think so.
But really, the advantage of plyos vs. strength training is that only the plyos overload/or load at whatever intensity - the lower legs. In the squats and deadlifts the lower leg isn't nearly as active as in a plyometric effort, even at medium intensity.
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Bone density improving in two weeks? I don't think so.
But really, the advantage of plyos vs. strength training is that only the plyos overload/or load at whatever intensity - the lower legs. In the squats and deadlifts the lower leg isn't nearly as active as in a plyometric effort, even at medium intensity.
i don't get why there has to be an 'advantage' though, plyos & strength training both offer different advantages, they go hand in hand.
but you're definitely right on the lower-leg aspect, that is very important though and often overlooked/neglected. explosive/bouncy ankles = more speed & more vert.
pc
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alright it could have been a little longer, but it was 1 split basically, and I could run and take a dunk, before that it was 4 long forceful, slow, strides. I did high 1 legged drops mostly, a lot harder than 2 footed. The gains were quick however... have you never felt the potentiation from 1 single plyo workout? SOmetimes three days after bounding, my ground contact times are just way quicker. Doesn't last forever though