Biomechanics and Motor Control Laboratory, School of Physical Education and Sport of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil; Rehabilitation and Functional Performance Graduate Program, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
Biomechanics and Motor Control Laboratory, School of Physical Education and Sport of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil; Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
Gait Posture. 2020 Mar;77:52-58. doi: 10.1016/j.gaitpost.2020.01.017. Epub 2020 Jan 21.
Muscle fatigue is characterized by a decrease in muscle performance, accompanied by an increase in perceived exertion to produce a desired amount of force. The duration of the fatigue effects is not completely clear regarding postural sway and force production in athletes.
What is the effect of a specific fatigue protocol in postural sway and force production in female handball athletes and the recovery time necessary for these variables?
Twenty female handball athletes participated in this study. Specific handball actions composed the fatigue protocol in the format of a circuit with the gradual increment of laps. They stood upright in one-leg posture on a force plate. For the maximum propulsion force (F), they performed a countermovement jump on the force plate. The center of pressure (COP) and the F were obtained at baseline, immediately after the exhaustion due to the fatigue protocol and every minute during the first 10 min of the recovery phase.
The F decreased ∼9.5% after the fatigue protocol, whereas de COP area increased 224%. During the recovery phase, the F and the COP area returned to baseline values after five minutes.
The first five minutes immediately after the fatigue protocol represent the time interval where the fatigue effects are still present. Future studies willing to investigate the effects of fatigue in athletes should perform the analysis within this short time-window.
肌肉疲劳的特征是肌肉性能下降，同时产生所需力量的感觉用力增加。关于运动员姿势摆动和力量产生的疲劳效应持续时间尚不完全清楚。
特定的疲劳方案对女性手球运动员的姿势摆动和力量产生有什么影响，以及这些变量恢复所需的时间是多少？
20 名女性手球运动员参加了这项研究。疲劳方案由一系列手球动作组成，以循环的形式进行，逐渐增加圈数。他们单脚站立在测力板上。为了获得最大推进力（F），他们在测力板上进行了反向跳跃。在基线、由于疲劳方案导致的疲劳后立即以及恢复阶段的前 10 分钟内的每一分钟，获得了中心压力（COP）和 F。
疲劳方案后，F 下降了约 9.5%，而 COP 面积增加了 224%。在恢复阶段，F 和 COP 面积在五分钟后恢复到基线值。
疲劳方案后最初的五分钟代表疲劳效应仍然存在的时间间隔。未来有意愿研究运动员疲劳影响的研究应在此短时间窗口内进行分析。
