Why does inhaling helium make your voice go high-pitched? | Notes and Queries | caztuning.info
Improving Search Results Quality by Customizing Summary Lengths. Michael Kaisser . There is also a tension between showing short snippets that a sentence wasn't much more information beyond the exact . crossword puzzle answers). General trends but not definitive relationships between query type (as. with increasing sarcomere length. length as no additional cross-bridges can . Length-tension relationship of sarcomeres presented in a graphical form. Further muscular contraction is halted by the butting of myosin filaments against the.
So this is our myosin. And actually, I'm going to make some copies of it now, just to make sure that I don't have to keep drawing it out for you. But something like that. And we'll move it to be just below so that you can actually see, when I draw a few of them, how they differ from one another. So I'm going to put them, as best I can, right below one another. And we'll do a total of, let's say, five. And I think, by the time we get to the fifth one, you'll get an idea of what this overall graph will look like.
So these are our five myosins. And to start out at the top, I'm going to show a very crowded situation. So this will be what happens when really nothing is spread out. It's very, very crowded. And you recall that you have actin, this box, or this half box that I'm drawing, is our actin. And then you have two of them, right? And they have their own polarity, we said.
And they kind of go like that. And so, in this first scenario, this very, very first one that I'm drawing, this is our scenario one. We have a lot of crowding issues. That's kind of the major issue, right? Because you can see that our titin, which is in green, is really not allowing any space. Or there is no space, really. And so, these ends, remember these are our z-discs right here. This is Z and this is Z over here. Our z-discs are right up against our myosin.
In fact, there's almost no space in here. This is all crowded on both sides. There's no space for the myosins to actually pull the z-disc any closer.
Length tension relationship | S&C Research
So because there's no space for them to work, they really can't work. And really, if you give them ATP and say, go to work. They're going to turn around and say, well, we've got no work to do, because the z-disc is already here.
So in terms of force of contraction for this scenario one, I would say, you're going to get almost no contraction.
So when the length is very low, so let's say this is low. Maybe low is not a good word for length. Let's say this is, I'll use the word short.
The sarcomere is short. And here the sarcomere is long.
So when it's short, meaning this distance is actually very short, then we would say the amount of tension is going to be actually zero. Because you really can't get any tension started unless you have a little bit of space between the z-disc and the myosin. So now in scenario two, let's say this is scenario two. And this is my one circle over here. In scenario two, what happens? Well, here you have a little bit more space, right?
So let's draw that. Let's draw a little bit more space. Let's say you've got something like that. And I'm going to draw the other actin on this side, kind of equally long, of course.
I didn't draw that correctly.
Length tension relationship
Because if it's sliding out, you're going to have an extra bit of actin, right? And it comes up and over like that. In the long muscle length group, the angle of peak torque did not change after training. In another study design, Guex et al. The subjects in both groups trained using knee flexion muscle actions, but one group performed the exercise lying down, with the hip in 0 degrees of flexion full extensionwhile the other group performed the exercise seated, with the hip in 80 degrees of flexion.
However, a minority of trials have also reported no increases Kawakami et al. This suggests that increases in muscle fascicle length are partly responsible for the change in the angle of peak torque after strength training, although other factors are likely involved. The effects of muscle length during strength training on angle of peak torque are unclear, but longer muscle lengths may lead to greater shifts in the angle of peak torque.
Muscle fascicle length does tend to increase after strength training, particularly after eccentric training.
- Sarcomere length-tension relationship
- Length-tension relationship
The relationship between the change in the angle of peak torque after strength training and the increase in muscle fascicle length is unclear, but there does appear to be a moderately-strong relationship, at least after eccentric training.
Effects of dynamic resistance training on fascicle lengthand isometric strength. Journal of Sports Sciences, 24 05 Effects of isometric training on the knee extensor moment-angle relationship and vastus lateralis muscle architecture.
European journal of applied physiology, 11 Muscle architecture adaptations to knee extensor eccentric training: Effect of testosterone administration and weight training on muscle architecture. Training-specific muscle architecture adaptation after 5-wk training in athletes. Influence of concentric and eccentric resistance training on architectural adaptation in human quadriceps muscles.
Length-tension relationship :: Sliding filament theory
Journal of Applied Physiology, 5 Damage to the human quadriceps muscle from eccentric exercise and the training effect. Journal of sports sciences, 22 Altering the length-tension relationship with eccentric exercise.
Sports Medicine, 37 9 Effects of eccentric exercise on optimum length of the knee flexors and extensors during the preseason in professional soccer players. Physical Therapy in Sport, 11 2 Is the force-length relationship a useful indicator of contractile element damage following eccentric exercise?. Journal of biomechanics, 38 9 Intensity of eccentric exercise, shift of optimum angle, and the magnitude of repeated-bout effect.
Journal of applied physiology, 3 The effects of eccentric hamstring strength training on dynamic jumping performance and isokinetic strength parameters: Physical Therapy in Sport, 6 2 Fatigue affects peak joint torque angle in hamstrings but not in quadriceps. Divers use mixtures containing helium heliox and trimix to dive to depths much over 50 metres, and electronic convertors are needed to convert their squeaky speech into something comprehensible.
As a postgraduate student, I very ill advisedly tried breathing the heavy, rather inert gas sulphur hexafluoride whose speed of sound is nearly three times slower than in air. It had the opposite effect, and I become an instant basso profundo; I survived, and a few breaths later my voice returned to normal, but as they say, please don't try this at home! In a sound wave the product of wavelength and frequency is a constant and is equal to the sound speed. I'm afraid this isn't a very rigorous answer but, using this relationship, we know the local sound speed is increased and given that the wavelengths of the noises produced are more or less unchanged presumably since the dominant wavelengths produced in speech depend mainly on the geometry and the dimensions of the throat during a particular articulation the frequency or pitch will therefore rise.
On a tangent to this, natural changes in the composition of air as it is exhaled, due to increased carbon dioxide lower sound speed than oxygen and nitrogen and reduced oxygen, should result in a perceptable downward shift in frequency.
This might be noticeable for example when blowing a very long note with a woodwind instrument - that is, if it isn't sub-consciously corrected for. I've never tried it myself. R Telling, Weymouth Dorset Helium is much less dense than air, so our vocal cords encounter far less resistance in this medium, making the vibrations much more frequent.