Shock and Vibration is archived in Portico, which provides permanent archiving for electronic scholarly journals, as well as via the LOCKSS initiative. It operates a fully open access publishing model which allows open global access to its published content. This model is supported through Article Processing Charges. For more information on Article Processing charges in general, click here.
7. Antman EM, Anbe DT, Armstrong PW, et al. ACC/AHA guidelines for the management of patients with ST-elevation myocardial infarction: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Committee to Revise the 1999 Guidelines for the Management of Patients with Acute Myocardial Infarction). Circulation 2004;110:e82-e292[Erratum, Circulation 2005;111:2013-4, 2007;115(15):e411.]
To get your training started, you need a way to measure your jump. If you’re testing your vertical at gym or in a professional type setting, they may have a Vertec. The Vertec is one of the most common apparatus for measuring vertical jump ability. It is the vertical jump-testing device of choice for many college and professional teams, but they also have the budget for such a thing. If you’re wanting to test your vertical in a budget-friendly way, you can easily use a measuring tape, a marked wall, or chalk for marking a wall.
The defining characteristic of the depth jump is that the jump is preceded with the strong eccentric (negative) muscle action caused by dropping down from a raised surface, as opposed to a standard box jump where you start on the floor. This makes the depth jump a true plyometric movement, where the muscles are stretched suddenly (by the impact of the landing), producing a powerful shortening of the muscle fibers.
The amount of resistance a shock absorber develops depends on the speed of the suspension and the number and size of the orifices in the piston. All modern shock absorbers are velocity sensitive hydraulic damping devices - meaning the faster the suspension moves, the more resistance the shock absorber provides. Because of this feature, shock absorbers adjust to road conditions. As a result, shock absorbers reduce the rate of:
I sent a video of my soccer ball dunk to Todd, the #fivefivedunker, who informed me that I was leading with the wrong leg. I’d been taking my last big step with my left foot, which, as a righty, was like swinging a bat cross-handed. A few days later I encountered a blogger and 43-year-old dunker named Andy Nicholson who showed me, among many other things, that I wasn’t the only one with blood on my hands. Nicholson was one of dozens of YouTubers, young and old (mostly young), who were documenting online their attempts to dunk. “Yes!” he yelled over the phone when I told him about the open sores on my fingers. “Those are badges of honor!”
Vertical jump training and assisted vertical jump training (essentially with a negative load) can each increase vertical jump height through increases in countermovement depth, even while actually reducing peak force produced in the jump. This seems to happen because the tendon becomes more compliant after these types of training, which means they elongate more during the countermovement phase of the jump.
When performing a vertical jump, the athlete exerts force at the low back, hip, knee, and ankle joints. The spine flexes as the athlete squats downwards, and then is extended by the spinal erectors over the course of the jump. The hip extensors (gluteus maximus, hamstrings, and adductor magnus) work to move the trunk and the thigh apart, which pushes the torso up and backwards. Meanwhile, the knee extensors (quadriceps) contract to extend the knee, and the calf muscles contract to move the shin backwards, towards the vertical.
Technique Tip: Determining how far out in front of you to place your front foot may require some trial and error. At the bottom of the motion, your front knee should be somewhere above your heel to mid foot. If your knee is behind your heel, your foot is too far forward; if it’s out over your toes, step out further. One trick to find the right distance is to start in the bottom position and adjust your stance from there. Then stand up and have someone hand you the dumbbells.
But you know what? Because these help with your jumping, you will become an amazing rebounder, blocker, and, well, dunker! In 2016, according to MaxPreps, I was 14 in the country in average blocks per game (National Basketball (2016-17) Blocks Stat Leaders, I’m 14th ;P). I had two triple-doubles. No, not points, rebounds, and assists, but points, rebounds, and BLOCKS.
Among patients with cardiogenic shock, the rate of death was significantly higher in the group treated with dopamine than in the group treated with norepinephrine, although one might expect that cardiac output would be better maintained with dopamine26-28 than with norepinephrine. The exact cause of the increased mortality cannot be determined, but the early difference in the rate of death suggests that the higher heart rate with dopamine may have contributed to the occurrence of ischemic events. Whatever the mechanism may be, these data strongly challenge the current American College of Cardiology–American Heart Association guidelines, which recommend dopamine as the first-choice agent to increase arterial pressure among patients who have hypotension as a result of an acute myocardial infarction.7
IMPORTANT NOTE: Feb 2, 2019 - I am currently updating the site to have all the articles on the same format and also shooting new HD videos of the exercises in the library. For the duration of the this update I am selling Game Changers at an 80% discount (YES YOUR READ THAT RIGHT - 80% OFF the regular price). Instead of paying $47 you can pick up a copy of just $9. But hurry - this offer will be gone once I finish the updates.
Exactly which muscles are most important for improving the vertical jump is still relatively unclear, and may differ between individuals. Clearly, the spinal erectors, hip extensors, quadriceps, and calf muscles are all involved in the jumping movement, and the hip extensors and quadriceps are likely the prime movers, but which of the hip extensors is the primary muscle is very unclear. Importantly, since force production is required right up until take-off, the lower body muscles must produce force from moderate through to short muscle lengths, which differs from the barbell back squat exercise.
This is why using a slightly deeper countermovement often increases jump height, because the larger range of motion allows the muscles to exert force for a longer duration of time before take-off. Jump height *can* increase even though the force produced is almost always smaller. (Force is smaller when the countermovement is deeper partly because shortening through a longer range of motion leads to a faster contraction velocity, on account of the force-velocity relationship, and partly because the leverage of bodyweight on the lower body joints is larger with a deeper countermovement).
Keep your upper body straight and your arms relaxed at your side. Extend your left leg straight out behind you with a slight knee bend. Place your right leg in front of you with your knee bent at a 90-degree angle and your thigh parallel to the floor. This is your basic lunge position. From this position, slightly lower your entire body, and jump to the opposite lunge position with your right leg extended behind you and your left leg in front of you. Repeat 25 jumping lunges in a row for three sets with a 1-minute break between sets.
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Vertical jumps are used to both train and test for power output in athletes. Plyometrics are particularly effective in training for power output, and include vertical jumps of different types in their protocol. In one recent study, training with plyometrics (which included continuous vertical jumps) was shown to improve jump height and boost vertical jump performance to similar degrees in combination with very different resistance training protocols, indicating that the plyometric jumping contributed to the increased jump height more than resistance training. Research into plyometric jumps found vertical jumps to be among the highest in terms of muscle recruitment (as measured by electromyography), power output, and ground reaction force produced. Fatigue has been researched in athletes for its effect on vertical jump performance, and found to decrease it in basketball players, tennis players, cyclists, rugby players, and healthy adults of both genders.