College of Health Sciences, University of Memphis, Memphis, TN, USA.
Department of Kinesiology, East Carolina University, Greenville, NC, USA.
Scand J Med Sci Sports. 2021 Feb;31(2):380-387. doi: 10.1111/sms.13857. Epub 2020 Nov 7.
Recently, we proposed the hypothesis that weekly running volume and preferred running pace may play a role in preserving ankle joint kinetics in middle-age runners as ankle joint kinetics were generally similar in young and middle-aged runners with similar running volume and preferred pace. To further address this hypothesis, we compared lower extremity joint kinetics between high and low training volume runners in both young and middle-aged groups. Joint kinetics calculated from 3D kinematic and ground reaction force data during over-ground running at 2.7 m·s from young and middle-aged runners who ran low or high weekly volume were analyzed. A two-factor analysis of variance was used to compare joint kinetics between age and running volume groups. Positive hip work was greater in middle-aged compared to young runners (P = .005). Plantarflexor torque (P = .009) and positive ankle work (P = .042) were greater in young compared to middle-aged runners. Positive ankle work was also greater in the high compared to the low volume group (P = .021). Finally, age by volume interactions were found for knee extensor torque (P = .024), negative knee work (P = .018), and positive knee work (P = .019) but not for ankle and hip joint kinetics. These findings suggest less distal-to-proximal difference in positive joint work with high running volume in both young and middle-aged runners as a result of greater power generation at the ankle. Given the age main effects, our findings are also the first to suggest the age-related distal-to-proximal shift in joint kinetics appears in middle-aged runners.
最近，我们提出了一个假设，即每周跑步量和偏好的跑步速度可能在保持中年跑步者踝关节动力学方面发挥作用，因为在具有相似跑步量和偏好速度的年轻和中年跑步者中，踝关节动力学通常相似。为了进一步验证这一假设，我们比较了年轻和中年组中高训练量和低训练量跑步者的下肢关节动力学。分析了来自在 2.7 m·s-1 的地面上以 2.7 m·s-1 的速度进行的 3D 运动学和地面反作用力数据计算的下肢关节动力学。使用两因素方差分析比较年龄和跑步量组之间的关节动力学。与年轻跑步者相比，中年跑步者的髋关节正功更大（P =.005）。与中年跑步者相比，年轻跑步者的跖屈肌扭矩（P =.009）和踝关节正功（P =.042）更大。与低训练量组相比，高训练量组的踝关节正功也更大（P =.021）。最后，发现膝关节伸肌扭矩（P =.024）、膝关节负功（P =.018）和膝关节正功（P =.019）的年龄与体积相互作用，但踝关节和髋关节动力学没有相互作用。这些发现表明，由于踝关节处的功率产生更大，高跑步量的年轻和中年跑步者的正向关节功的远近差异较小。考虑到年龄的主要影响，我们的发现也是首次表明，与年龄相关的关节动力学从远端到近端的转移出现在中年跑步者中。
