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Posture assessments. A PA200LE Body Monitoring and Analysis System (The Big Sports Co. Ltd., Japan) was utilized to assess the neck inclination (NI), pelvic inclination (PI), forward neck (FN), forward upper part of body (FUPB), forward lower part of the body (FLPB), neck torsion (NT), shoulder torsion (ST), waist torsion (WT), shoulder level (SL), waist level (WL), lateral neck inclination (LNI), lateral upper part of body inclination (LUPBI) and lateral lower part of body inclination (LLPBI). In a private room, the participant stood on the plantar pressure plate, with the camera located 2.4 m in front of the plate, and the red cross bean of the camera was calibrated to be coincided with the white cross on the plantar pressure plate before the commencement of assessment. During the postural assessments, the participants wore close-fitting attire, the markers for photo-image analysis were affixed to the anatomic landmarks on the body. The landmarks included the sternal notch, the spinous process of the seventh cervical vertebra, the greater tubercle of the left and right humerus, the navel, the left and right posterior superior iliac spine, the left and right anterior superior iliac spine, the left and right greater trochanter of femur, the lateral condyle of tibia of the left and right legs, the left and right patella, and the fifth trochanter of the left and right foot. The participants stood on the plantar pressure plate with their feet 10 cm distance apart and the fifth metatarsal tuberosity of their feet aligned with the white line in the sagittal direction of the plantar pressure plate, looking forward, and their hands dropping naturally on both sides of the body. While keeping the left and right markers of the fifth metatarsal on the platform line, the participant was instructed to make four 90-degree rotations and obtained four photos of the front, sides and back views. A total of three measurements were made for each participant, and the average values of three measurements was used in further analysis.
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The football players in our current study showed a significantly higher NSTKA as compared with the CG. Grabara (2012) studied the effect of football on adolescent spinal curvature and reported that, compared with the control group, football players had a significantly higher LLA, but there was no significant difference in TKA. In the study of Grabara (2012) there were significant differences in body weight and BMI between the football group and the control. The influence of body weight and BMI may be the reason why the results of Grabara (2012) are different from ours. Watson & Mac Donncha (2000) studied the relationship between the cumulative sport training hours and the sagittal curvature of the immature spine and reported that, the TKA and LLA became larger when they were engaged in football for 282 h per year, compared with the blank control. In our study, an inclusion criterion of the participants in the football group was that the practicing time was no less than 4 h per week, and the total exercise time of no less than 192 h a year. However, the intensity of amateur participants could be much less than that of professional athletes. The lower exercise intensity and exercise time may be the reason why the LLA did not show a significant difference between the football and the control group in this study.
The table tennis group in our study showed a smaller USTKA and DLTKA, compared with the CG. Table tennis exercise requires athletes to lean forward slightly. In order to maintain this posture, it is necessary to contract the posterior bracelet muscles, whose function is to limit forward flexion and keep the body upright. Long-term table tennis practice may strengthen the posterior bracelet muscles. The enhancement of the posterior chain muscle group may be the reason for the decrease of compensation of TKA in upright sitting and desk learning position in the table tennis group. Table tennis is one of the fastest sports (Kondrič, Zagatto & Sekulić, 2013), mainly because the distance between athletes is short and the ball speed is fast, so the reaction time of athletes is generally short. In order to choose the optimal angle and position when hitting the ball, the players usually adopt the preparation posture. Bańkosz & Barczyk-Pawelec (2020) studied the posture difference between table tennis players in normal standing and the preparation posture, and showed that when in the preparing posture, the inclination angle of trunk increased. Our research results also showed that the right shoulder and anterior superior iliac spine of the table tennis group was higher, which may be due to the fact that most teenagers were right handed (Scharoun & Bryden, 2014). When in a preparation posture, they would tilt their torso to the left and elevate their right shoulder. Long-term practice with that posture would lead to a higher level of the right shoulder in the table tennis group. Our study showed that asymmetrical movement was more likely to make the body deviate from frontal plane and horizontal plane.
Features and characteristics measured by the MMPI or MMPI-A in the assessment of adolescents serve to describe the teenagers at the moment of testing. Adolescents' test scores often do not provide the types of data necessary to make accurate long-term predictions concerning personality functioning.13
The current analysis suggests that amateur sport practice may have a role in addressing psychological and personality problems that are associated with or exacerbated by the disruption of everyday life due to natural catastrophic events. When based on expectations about one's own time and leisure, choosing to practice sports appears to reveal deep psychological patterns that affect social interaction and personal self-estimation. The comparisons in this study provide evidence that adolescents exposed to sports show a better response to extreme situations such as earthquakes when compared with adolescents not exposed to sports. 2ff7e9595c
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