The purpose of this study was to examine biomechanical performance of the foot-up serve (FUS) in female tennis players at different skill levels. FUS analysis was completed in the biomechanical laboratory by 32 female college tennis players at three different levels. During FUS, 3D-biomechanical data from tennis players' lower limbs were collected. One-way ANOVA was used to examine differences in kinematic and kinetic data between groups Range of motion (ROM) of bilateral lower-limb joints revealed significant differences in kinematics performance during both the preparation and landing cushion phases ( < 0.05). During preparation, Level 3 was significantly longer than Level 2 (P-a = 0.042, P-b = 0.001, and P-c = 0.006). During the flight phase, significant differences between levels 1 and 3 (P-a:0.002) and levels 1 and 2 (P-c:0.000) were discovered (P-a:0.002 and P-c:0.000). There were significant height differences between levels 1 and 2 as well as between levels 1 and 3. (P-a = 0.001, P-c = 0.000). During serve preparation (P-c = 0.001) and landing, GRF's peak was significantly higher than level 3. (P-c:0.007). Significant differences were found between groups in the LLS preparation stage, with level 3 significantly higher than levels 1 and 2. (P-a = 0.000, P-b = 0.001, and P-c = 0.000); during landing, level 2 LLS was significantly higher than levels 1 and 3. (P-a = 0.000, P-b = 0.000, and P-c = 0.035). The range of motion of joints and the stiffness of the lower limbs have a significant impact on a tennis player's FUS performance. A larger of joint mobility and lower-limb stiffness promote better performance during the FUS preparation stage.
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http://dx.doi.org/10.3389/fphys.2023.1125240 | DOI Listing |
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Foot and Ankle Surgery Center, Beijing Tongren Hospital, Capital Medical University, Beijing, 100176, China.
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Department of Orthopaedic Surgery, Henry Ford Hospital, Henry Ford Health, 2799 W. Grand Blvd CFP-6, Detroit, MI, 48202, USA.
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View Article and Find Full Text PDFJ Am Med Dir Assoc
December 2024
School of Nursing, Peking University, Beijing, China. Electronic address:
Objectives: Malnutrition is generally studied to be involved in outlining hazard frailty trajectories, resulting in adverse outcomes. In view of frailty's multidimensional nature, we aimed to assess the contribution of nutritional items in existing frailty tools to adverse outcomes, and develop and validate a nutritional frailty phenotype based on machine learning.
Design: A population-based prospective cohort study.
World Neurosurg
December 2024
Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan Province, P.R. China. Electronic address:
Introduction: Spinal arachnoiditis (SA) involves chronic inflammation of the spinal arachnoid membrane, often due to surgery, trauma, infections, or autoimmune issues. It leads to ongoing pain and sensory disturbances in the back and lower limbs, along with possible bladder and bowel issues. Treatments focus on symptom relief and improving life quality.
View Article and Find Full Text PDFJ Med Case Rep
December 2024
Department of Neurosurgery, The First Affiliated Hospital of Henan University of Science and Technology, 24 JingHua Road, Luoyang, 471000, Henan, China.
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