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Chapter : Post isometric relaxation technique

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amigo
5 Mar 2022
School
Kerala University of Health Sciences - KUHS
Department
Physiology
Course
KUHS
Professor

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Document Summary

Flexibility can be chieved by a variety of stretching technique, yet little research has been performed on the most effective method. The objective of the study is to investigate the effectiveness of post isometric relaxation technique in reducing the hamstring tightness. And also evaluating the post isometric relaxation in improving the hamstring flexibility. Both post isometric relaxation technique and passive stretching have been proven to be effective technique to improve hamstring flexibility, the study concluded that the post isometric relaxation technique is more effective. Hamstring muscle most commonly involved in muscular injury of the pelvis, hip and thigh. Hamstring group of muscle consist of semitendinosus and bicep and femoris, the collective term hamstring refers to four muscles located in the posterior compartment of thigh, semitendinosus, semimembranosus, long head of biceps femoris and short head of bicep femoris. Hamstring tightens effect the walking, running and also other sports activities as the flexion of knee and extension of the hips are affected.

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Related Questions

http://www.webassign.net/plmechalg/images/4-post-02.GIF

You will solve a general Atwood Machine problem usingconservation of energy techniques. The system starts at rest withheights h1 and h2 as shown in the figure below. It is then releasedand, once in motion, m2 falls to the ground. The string does notstretch.

(a) What is the total initial mechanical energy of the two masses?(Use m1, m2, h1, h2, and g as appropriate.)
Ei = msgh2 +m1gh1

(b) What is the total final mechanical energy of the two masses?(Use m1, m2, h1, h2, vf, and g as appropriate.)
Ef = ?

(c) Use your answers to parts (a) and (b) to eliminate h1. Solvefor vf. (Use m1, m2, h2, and g as appropriate.)
vf = ?

(d) Suppose h2 = 11.6 m, m1 = 9 kg and m2 = 12.5 kg, what is thevelocity at which m2 hits the ground?


1. Geometrical Optics: A candle is at the center of curvature of aconcave mirror with focal length of fm= 10 cm. A divergingent lenshas a focal length of f1= 20 cm and is 60 cm to the right of thecandle. The lens forms two images of the candle. The first isformed by light passing directly through the lens. The second imageis formed from the light that goes from the candle to the mirror,isreflected, and then passes through the lens.

A. Use ray tracing techniques on the diagram above to determinethe approximate position ofeach image.

B. Determine the location of each of the images with respect tothe mirror.

C. Are they real or virtual? (give your answers for each of theimages).

Image1: REAL or VIRTUAL

Image2: REAL or VIRTUALD.

Are they upright or inverted?

Image1: UPRIGHT or INVERTED

Image2: UPRIGHT or INVERTEDE.

If the candle height is 5 cm what will be the height of theimages

Part 2 is here :

http://www.cramster.com/answers-nov-10/physics/rotating-pendulum-part-2-rotating-pendulum-part-ii-note-part-httpww_1015121.aspx

This is the same rotating pendulum of the previous two problems.Now it is time to analyze the different types of motion andequilibrium (according to the initial conditions).
Note: The “effective potential” method is a powerful tool to analyzeand solve problems where the Hamiltonian is conserved. A similartechnique is used for central potentials, including the Keplerproblem of celestial mechanics (two-body gravitationalproblem)—will see that later.
(a) Let us call Eeff ≡ H the “effective energy.” To make it look likea real energy, define Eeff = T2 + Veff , where Veff should include therelevant non-quadratic piece of kinetic energy (which effectivelybehaves, with an appropriate sign, as a potential energycontribution). In short, the effective potential is defined so thatthe effective kinetic energy left in the Hamiltonian is justquadratic.
Your task: Find the corresponding effective potential Veff (θ), i.e.,write it down explicitly as a function of θ.
Hint: Using the resolution T = T0 + T1 + T2 , it should follow thatVeff = V − T0 (using
Euler’s theorem for homogeneous functions).
(b) Analyze all possible shapes of the graph of the effectivepotential Veff (θ) (versus θ). For this purpose, simply use calculusand the techniques for energy graphs that we studied withone-dimensional systems. Specifically, you should plot Veff (θ) andfind the extrema.
Hint: There should be two different regimes (or two “families” ofshapes).
(c) At what rotation rate ωc does the stationary point at θ = 0become unstable?
(d) For ω > ωc , what is the stable equilibrium value ofθ?
Explain the physical meaning of this stable “dynamic equilibrium”value. Also explain in simple terms why θ = 0 is a stable “dynamicequilibrium” position for ω < ωc .
(e) What is the frequency Ω of small oscillations about the“dynamic equilibrium” points (for each of the two regimesdiscovered above)? Compute this frequency in two differentways:
(i) using the effective potential; and (ii) linearizing the equationof motion.