We Lose Power With Age Because Our Muscles Get Weaker- Not Slower – BionicOldGuy

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It is well identified within the exercise science literature that older adults have much less potential to supply highly effective actions, like a standing vertical leap from a bent-knee place. Power is pressure occasions pace, so you can lose energy from a lack of power (thus much less potential to supply pressure) or out of your muscle tissue getting slower (unable to contract as quick), or a mix of each. It has been controversial which of those is the offender. An fascinating new research did an experiment that appeared to put the blame extra on lack of power. The authors recruited youthful topics (age starting from 20-30), and older topics (age starting from 65-86). They first examined the topics’ static leg power in a knee extension machine. It was discovered that older topics had decrease static power on common. So after they are attempting to do a leap, which requires accelerating their body weight, they are having to maneuver the next proportion of their most leg power. Muscles can contract quicker towards much less resistance, which is why you may throw a baseball farther than a shotput. Next, they got here up with a solution to make topics successfully lighter or heavier as they did the leap. To make them heavier they only wore a weighted vest. To make them lighter, they wore a vest connected to a cable that went over a pulley, with weight on the opposite side, so the cable was pulling them up. Now they had the topics do the leap towards regular weight, weight lowered by 15%, and weight elevated by 15%. From the outcomes they have been capable of present the older topics have been capable of produce the identical take off velocity because the youthful topics, so long as they have been leaping towards the identical proportion of their max power because the youthful topics. The authors famous: “The most important remark of this research was that the decrease energy producing capability of older than younger individuals was primarily resulting from a lack of pressure producing capability, moderately than a slowing of the contractile properties of the muscle“.

The authors also measured efficiency in a motion that is a typical exercise of each day living known as the “timed up and go” (TUG) take a look at: The topics had to rise up out of a chair, stroll a brief distance round a cone, then sit again down and the sequence was timed. It was discovered that all topics, younger and previous, took about the identical period of time to do that motion, so long as their potential to generate energy, as measured within the leap take a look at, was above a sure vital worth in comparison with their body weight (this worth turned out to be 23.7 watts per kilogram of body weight). But for topics whose potential to generate energy fell beneath this vital worth, efficiency within the TUG take a look at declined considerably.

All of this ought to be motivation to maintain doing power training as we age. Movements that are actions of each day living, like getting out of a chair or going up and down stairs, will in any other case become more and more tough and slower, as proven within the TUG take a look at outcomes above. This new research implies that it is extra essential to keep up power, and energy will take care of itself, so leg presses is perhaps extra essential than field jumps. But I prefer to cowl my bases by engaged on each.


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