Height Creep To Research On The Effects Of Bending Relaxation Properties

Purposes: The purpose of the study was to investigate the effect of the spinalshrinkage on the characteristic of flexion relaxation phenomenon in erector spinaemuscle. In the process of experiment test muscles is elector spinae (ES), rectusabdominis (RA), external oblique (EO) and biceps femoris (BF)。The second isaccording to the muscles of the intensity of the relationship between muscle, discussestest the four muscles in the process of flexion in coordination.Methods: 12 male university students volunteered for this study. Theexperimental process test for main muscle elector spinae (ES) vertical spinalmuscular, rectus abdominis (RA) abdominal muscle, external oblique (EO) abdomenbiceps femoris and the oblique muscle (BF) shares biceps four muscles. The spinalshrinkage was made with a load of 20% body weight on shoulder in 10 min. Eachperformed three trials of lumbar flexion-extension with the cycle of 5s flexion, and 5sextension in standing before and after shrinkage. EMG signals acquisition and digitalcamera synchronously, experimental data in the weight three times before and aftershrinkage.Results: Human body in 10 minutes with static load their shoulders weight 20%of the conditions, the average height creep of 5.9 mm. Bending process, in the fleshreport close (EMG-off), before and after loading, the trunk inclination Angle theintimacy competency scale from 51.7°into 55.2 absolute value°(p = 0.039) at thesame time and the relative value of Angle from 83.2% to 90.1% (p = 0.030), flexor waist Angle from 69.0°Angle absolute value to 80.5°(p = 0.020) at the same timeand the relative value of Angle from 71.1% to 81.9% (p = 0.030). In the flesh reportopen (EMG-on), before and after loading, the trunk inclination Angle the intimacycompetency scale from 54.6°into 58.3 absolute value°(p = 0.015) at the same timeand the relative value of Angle from 87.9% to 95.0% (p = 0.003), flexor waist Anglefrom 76.1°Angle absolute value to 86.5°(p = 0.012) at the same time and therelative value of Angle from 78.7% to 88.0% (p = 0.030).Conclusion and suggestion: It was concluded that shrinkage developed inintervertebral discauses the erector spinae muscles to become active longer duringanterior flexion as well as extension period. It is not clear in this time that theshrinkage will cause the change of FRP. However, one explanation may be relative toneural reflex. 16 samples shaft spinal muscular EMG signals are detected (FRP)bending relax phenomenon, signal detection rate of 100%. The absolute value of thebiggest Angle, the weight of the body of dip Angleαbefore and after not significantly(P > 0.05) down, waist Angleβdoes not exist significant differences (P > 0.05).Muscle electricity shut (EMG-off) in Angle, the load of the body of before and afterthe intimacy competency scale absolute value inclination significantly (P < 0.05)down, waist Angle absolute value significantly (P < 0.05); Dip the relative value ofthe intimacy competency scale there exist significant difference (P < 0.05), bowedAngle relative value waist exists significant difference (P < 0.05). Muscle electricityopen (EMG-on) in Angle, the load of the body of before and after the intimacycompetency scale absolute value inclination significantly (P < 0.05) down, waist Angle absolute value significantly (P < 0.05); Dip the relative value of the intimacycompetency scale exist very significant difference (P < 0.01), bowed Angle relativevalue waist exists significant difference (P < 0.05). In the muscle coordination, rectusabdominis (RA) abdominal muscle, external oblique (EO) abdomen biceps femorisand the oblique muscle (BF) shares biceps three muscles data acquisition is notcomplete, biceps femoris (BF) shares biceps muscle electricity have been greater thanthe maximum value of 5% that have been in an open position that shares biceps inhuman waist in the process of bending don’t work. External oblique (EO) abdomenthe oblique muscle two sets of data show the open time is earlier than elector spinae(ES) vertical spinal muscular. More studies are necessary to understand clearly thechange of FRP after shrinkage in future.