La Trobe Rural Health School, La Trobe University, Bendigo, Australia.
La Trobe Rural Health School, La Trobe University, Bendigo, Australia.
J Bodyw Mov Ther. 2020 Oct;24(4):490-495. doi: 10.1016/j.jbmt.2020.05.006. Epub 2020 May 12.
It is unclear how cycling and running would differ in terms of changes in cartilage thickness. Also, given squats are a popular type of exercise used to strengthen lower limbs, it is critical to assess if loads used during resisted training could lead to changes in cartilage cushioning properties. Therefore, the purpose of this study was to compare the effects of exercise mode in knee cartilage thickness.
This study utilized a randomized cross-over design with repeated measures. All sessions were completed between 48hrs and seven days, at the same time of the day. Fourteen (seven males and seven females) apparently healthy participants without musculoskeletal or neurological diseases volunteered for the study. Participants were assessed after squats and functional exercises (n = 18 knees) or after running and cycling (n = 10 knees). All ultrasound images were collected at participants' arrival in the laboratory (Baseline), after warm-up (Pre-exercise), after the completion of each exercise protocol (Post-exercise), and at five (5-min) and 10 minutes (10-min) after exercise.
Cartilage thickness did not change after squats performed with 60% of 1-RM or after a set of three functional exercises (i.e. sit-to-stand, lunges, and step-ups; p = 0.68). However, longer duration exercises (i.e. cycling and running) led to increases in cartilage thickness after 5-min from the completion of the exercise (p = 0.02).
Knee cartilage may have capacity to sustain short-term cyclical loads applied during exercise (i.e. squats and functional exercises) but not to moderate duration exercises (i.e. cycling and running).
目前尚不清楚骑自行车和跑步在软骨厚度变化方面会有何不同。此外，由于深蹲是一种常用于增强下肢力量的流行运动类型，因此评估抵抗训练中使用的负荷是否会导致软骨缓冲特性的变化至关重要。因此，本研究的目的是比较运动方式对膝关节软骨厚度的影响。
本研究采用随机交叉设计和重复测量。所有的运动方案都在 48 小时到七天之间的同一时间完成。14 名（7 名男性和 7 名女性）无运动系统或神经系统疾病的健康参与者自愿参加了这项研究。参与者在深蹲和功能练习后（n=18 个膝关节）或跑步和骑车后（n=10 个膝关节）接受了评估。所有的超声图像都是在参与者到达实验室时（基线）、热身（运动前）、完成每项运动方案后（运动后）以及运动后 5 分钟（5 分钟）和 10 分钟（10 分钟）收集的。
用 1-RM 的 60%进行深蹲或完成三组功能练习（即坐立-站立、弓步和跨步）后，软骨厚度没有变化（p=0.68）。然而，长时间的运动（即跑步和骑车）会导致运动后 5 分钟软骨厚度增加（p=0.02）。
膝关节软骨可能有能力承受运动中短时间周期性负荷（即深蹲和功能练习），但不能承受中等持续时间的负荷（即跑步和骑车）。
