Chen Hairong, Shao Enze, Sun Dong, Xuan Rongrong, Baker Julien S, Gu Yaodong
Faculty of Sports Science, Ningbo University, Ningbo, China.
The Affiliated Hospital of Medical School, Ningbo University, Ningbo, China.
Front Physiol. 2022 Aug 19;13:907016. doi: 10.3389/fphys.2022.907016. eCollection 2022.
Running shoes with carbon plates have been identified to have positive effects on improving running performance from a biomechanical perspective. However, the specific difference between the effects of carbon plates with different longitudinal bending stiffness (LBS)on biomechanical characteristics and muscular mechanics of lower limbs in adolescent runners remains unclear. This study aimed to identify the difference in biomechanical characteristics and muscular mechanics in lower limbs during running stance phases between wearing shoes with low longitudinal bending stiffness (Llbs) and high longitudinal bending stiffness (Hlbs) carbon plates in adolescent runners. 10 male adolescent runners with a habit of daily running exercise (age: 13.5 ± 0.6 years; height: 166.3 ± 1.9 cm; bodyweight: 50.8 ± 3.1 kg; foot length: 25.4 ± 0.2 cm) were recruited and asked to conduct two times of tests by wearing shoes with Llbs and Hlbs carbon plates in a randomized order. Paired -test and statistical parametric mapping (SPM) analysis were used to identify the difference in biomechanical characteristics and muscular mechanics in lower limbs during running stance phases. Under the condition of wearing shoes with Hlbs, the time of foot contact significantly increased, whereas the range of motion (ROM) of hip and metatarsophalangeal (MTP) in the sagittal plane significantly reduced as well as the peak moment of ankle joint in the sagittal plane. The activations of vastus medialis, vastus lateralis, flexor digitorum brevis (flex dig brevis), and flexor hallucis longus (flex hall long) significantly increased under the condition of wearing shoes with Hlbs. According to the results of the SPM analysis, the joint angles (hip, ankle, and MTP), the net joint moments (knee, ankle, and MTP), and the muscle forces (gluteus maximus and tibialis anterior) were significant difference during the running stance phase between conditions of wearing shoes with Hlbs and Llbs. Running shoes with Llb carbon plates are appropriate for adolescent runners due to the advantages of biomechanical characteristics and muscular mechanics.
从生物力学角度来看，带有碳板的跑鞋已被证实对提高跑步成绩有积极作用。然而，不同纵向弯曲刚度（LBS）的碳板对青少年跑步者下肢生物力学特征和肌肉力学的影响之间的具体差异仍不明确。本研究旨在确定青少年跑步者在穿着低纵向弯曲刚度（Llbs）和高纵向弯曲刚度（Hlbs）碳板跑鞋时，跑步站立阶段下肢生物力学特征和肌肉力学的差异。招募了10名有日常跑步锻炼习惯的男性青少年跑步者（年龄：13.5±0.6岁；身高：166.3±1.9厘米；体重：50.8±3.1千克；脚长：25.4±0.2厘米），并要求他们以随机顺序穿着Llbs和Hlbs碳板跑鞋进行两次测试。采用配对检验和统计参数映射（SPM）分析来确定跑步站立阶段下肢生物力学特征和肌肉力学的差异。在穿着Hlbs跑鞋的情况下，足部接触时间显著增加，而矢状面髋关节和跖趾关节（MTP）的活动范围（ROM）以及矢状面踝关节的峰值力矩显著减小。在穿着Hlbs跑鞋的情况下，股内侧肌、股外侧肌、趾短屈肌（flex dig brevis）和拇长屈肌（flex hall long）的激活显著增加。根据SPM分析结果，在穿着Hlbs和Llbs跑鞋的情况下，跑步站立阶段的关节角度（髋关节、踝关节和MTP）、净关节力矩（膝关节、踝关节和MTP）以及肌肉力量（臀大肌和胫骨前肌）存在显著差异。由于生物力学特征和肌肉力学方面的优势，Llb碳板跑鞋适合青少年跑步者。
