جستجوی مقالات مرتبط با کلیدواژه "کشش دینامیک" در نشریات گروه "پزشکی"

Background and Aims:

 Shoulder impingement syndrome (SIS) can affect the proprioception and disturb the normal neuromuscular reactions that the protect the shoulder joint. There are various therapeutic strategies including stretching exercises to prevent the negative effects of SIS. This study aims to investigate the effects of static, slow and fast dynamic stretching on shoulder joint proprioception in male volleyball players with SIS.

Methods:

 Participants were 18 professional male volleyball players (Age: 26.52±1.5 years, weight: 89.72±7.02 kg, height: 196.78±6.32 cm) in Kerman, Iran suffering from SIS who were selected using purposeful and convenience sampling methods. All subjects were randomly performed one type of stretching exercises for three consecutive days at the same hour and their proprioception were measured by the Leighton flexometer and target angle reconstruction with external and internal shoulder rotations before and after stretching. The data were analyzed using repeated measures ANOVA.

Results:

 The static stretching signifcantly reduced the shoulder joint proprioception (P=0.001), while the dynamic stretching at different speeds had a significant positive effect on shoulder joint proprioception (P=0.001). There was no significant difference between the two types of slow and fast dynamic stretching (P=0.8).

Conclusion :

It seems that dynamic stretching at different speeds has a better effect on shoulder joint proprioception than static stretching in male volleyball players with SIS.

One of the most important factors in the proper functioning of the military is the accurate assessment of feedback. Among these, the proper knee joint proprioception is one of the most important factors in this regard. This study was performed to evaluate knee joint proprioception changes in military forces following a period of a static and dynamic stretching of hamstrings, quadriceps and gastrocnemius muscles.

The study was semi-experimental. The population of the study included the men AJA air defense base of Khatam al-Anbia (PBUH), among which, 60 individuals were randomly divided into three groups of 20; Static (height: 173.27, Weight: 78.14), Dynamic (Height: 175.08, Weight: 76.92), and Control (Height: 176.12, Weight: 80.09). The subjects in both groups of static and dynamic stretching performed their group-specific stretching programs. The goniometric method of digital images was used to measure the knee joint proprioception using AutoCAD software. One-way variance analysis test and paired t-test were used for results. The significance level in the present paper was considered to be 95% (α≤0.05) (SPSS 22).

The results of the knee joint proprioception variables showed a significant difference with the control group (slight increase), between the static groups (decrease, p=0.05) and the dynamics (decrease, p=0.004). There was also a significant difference in the measured variables in the in-group comparison in the static group (decrease, p=0323) and dynamics (decrease, p=0.002). (Reducing the absolute error values of the target angle reconstruction and, consequently, improving the knee joint propensity sensitivity).

Static and dynamic stretching exercises in the lower extremity can possibly affect muscle spikes, increase muscle temperature, trigger the activation phenomenon, repeat the movement in a specific pattern, and ultimately the phenomenon of post-traptional sensory drainage, increase the sensitivity of muscle receptors and ultimately improve the sense of knee joint condition. Since any proprioception sense of depression can lead to mechanical instability and ultimately cause the joint to be prone to mild blows and ultimately damage, stretching exercises may also change the muscle spindle properties and increase the knee proprioception. Also, dynamic stretching improves the ability to perform better in the knee joint proprioception variable relative to static stretchinglearning of nursing students as well as accepting responsibility professionals in medical sciences.

The previous studies on the effect of statics and dynamics stretching on forthcoming performance have reported various results. The purpose of the present study was to examine the effects of static and dynamic stretching types of muscles on local dynamic stability in angular displacement of the lower extremity joints in active males during cycling using innovative nonlinear analysis methods.
A total of 15 male university students of physical education and sport sciences at Kharazmi University voluntarily participated in the current study. Participants referred to the laboratory twice on two days seperated by a 48-hour interval, and the lower extremity kinematics data was collected from 30 pedaling cycles on the stationary cycle in 70 RPM in conditions of of without stretching, and 2, 5, and 10 minutes after stretching by means of motion analysis camera in 50 Hz frequency. The angular displacement of hip, knee, and ankle joints were extracted by constructing time series and Lyapunov Exponent (LyE) calculation.
The results of repeated measure ANOVA did not show any significant differences in angular displacement LyE in hip, knee, and ankle joints 2, 5, and 10 minutes post stretching (P>0.05).
Considering the results, both static and dynamic stretching types can be used in warm up programs before pedaling on stationary cycle for the pruposes of training or rehabilitation.