在铁人三项赛中的三个学科中，跑步是迄今为止铁人三项运动员受伤最常见的触发因素，并且经常是延长训练时间的长时间的原因。结果，教练经常寻找保持运动员训练以保持健身的方法，并在可能的情况下继续进行活动的培训。
受伤的运动员必须取得微妙的平衡；他们需要allow their body the time and rest needed for healing同时仍将其置于建立力量和健身所需的压力下。
Antigravity Running Devices
A couple of devices on the market aim to help runners in this regard. The杠杆运动系统在跑步机上跑步时，将不同的弹性带附加到紧身短裤上。它通过创建支撑力来起作用，从跑步机甲板垂直拉起跑步者。这使运动员可以消除多达45磅的体重。
Unlike the LEVER, a temporary device attached to any treadmill,另一个系统是Alterg。这是一个围绕跑步机建造的完全独立的单元。在Alterg中跑步需要穿上一条裙子，该裙子被拉到一个装有运动员腰部的大型气球中，封闭了整个跑步甲板。泵入气球的气压将跑步者从跑步机的甲板上抬起，减轻了体重。
这些设备旨在允许运动员继续运行ning with injury by running at a lower effective body weight. The question for coaches to consider before integrating either of these devices into an athlete’s program is, do they work? Ultimately, does the use of either of these devices allow athletes to exercise in a manner that promotes both injury rehabilitation and improved fitness?
Antigravity Tool Research
一项非常小的三主体研究使用杠杆设备似乎可以通过为跑步者提供宣传的体重减轻来减少地面力。从本质上讲，此时，直到可以确认更多数据为止。
一项不错的研究表明，他们看到在体重减轻的Alterg上运行时与较低的跑步重量相关的地面力。
Other studies have shown that with the reductions in ground forces, there are related reductions in contact forces on the bones of the lower limbs and decreased contraction forces of the leg muscles up to the glutei. Once again, this makes perfect sense; if you are running with less weight, you need to exert less muscular force to propel yourself forward and sustain less impact forces to your skeleton upon landing.
So the first part of the question has some science to back up the theory. Running with one of these anti-gravity devices will allow you to run while exerting a significantly lower physical toll on your body, thus allowing an injured runner to potentially continue to run.
但是问题的后半部分呢？以这种方式运行对健身和培训有益吗？几项研究已经检查了有关Alterg的这个问题，尽管迄今为止没有杠杆。
The most important finding related to fitness and training quality when running in an AlterG is that once you exceed a 20% weight reduction, you start to see a significant decrease in the metabolic needs for running and an increase in the time to exhaustion. Again, this isn’t hard to understand. If you are exerting yourself less because of a lower body weight, you will be metabolically less active and have a longer duration of activity before exhaustion.
Put another way by different authors, when running up to 9mph, a 25% reduction in body weight requires a 3 miles per hour increase in speed to run at the identical VO2 when running at total body weight. Several authors have found that, like increasing running speed, another way to improve training benefits while using weight reduction is to increase the treadmill’s incline, which is possible with both the AlterG and the LEVER.
Are Antigravity Devices Functional Training?
因此，在使用这些设备时，似乎有可能获得几乎定期的培训福利，但是我认为可以问的是，受伤的跑步者是否可以进行这些修改？如果您毕竟以某种方式受伤，那么您将能够将运行速度提高3英里或运行大量倾斜度的可能性有多大？这并不意味着不能做到这一点，只是必须考虑这一点。另外，如果您以20％的重量在这些设备上运行，而您的代谢需求几乎等同于跑步而无需减轻重量，那么您是否完全需要减轻体重？
研究这些设备的一种较低的替代品是deep water running。Some decent studies have looked at the benefits of this approach and shown that if done correctly, this activity can confer some real training benefits while exposing the body to essentially zero ground forces and allowing for maximal recovery. In the end, water running is a very viable strategy for the injured runner as it will allow for higher intensity without any stress on the skeleton, tendons or muscles that might be injured.
Both the AlterG and the LEVER Movement device offer anti-gravity options for injured runners to rehabilitate themselves in a manner that allows them to continue running while decreasing stress to their injured selves. The efficacy of that training will be significantly diminished unless they can increase their pace or the incline angle they’re running. Given the injury, these may not be possible. When factoring in the cost and inconvenience of both modalities, deep water running begins to look increasingly more attractive and a much more viable alternative.
努力训练，健康训练。
