Ebben William P, Flanagan Eamonn P, Jensen Randall L
Department of Physical Therapy, Program in Exercise Science, Strength and Conditioning Research Laboratory, Marquette University, Milwaukee, Wisconsin, USA.
J Strength Cond Res. 2008 Nov;22(6):1850-4. doi: 10.1519/JSC.0b013e3181875117.
The study assessed the effect of current activation potentiation by evaluating jaw clenching and its effect on the rate of force development (RFD), time to peak force (TTPF), and peak force (PF) during the countermovement jump. Fourteen subjects performed the countermovement jump on a force platform while maximally clenching their jaw on a dental vinyl mouthguard (JAW) as well as without clenching their jaw by jumping with an open mouth (NON-JAW). Results reveal that the RFD was 19.5% greater in the JAW compared with the NON-JAW condition (p < 0.05). The TTPF was 20.15% less in the JAW compared with the NON-JAW condition (p < 0.05). There were no significant differences (p = 0.60) in PF between the JAW and NON-JAW conditions. These findings indicate that concurrent activation potentiation is manifested through jaw clenching during the countermovement jump. As a result, athletes may employ this strategy of maximally clenching their jaws to gain an ergogenic advantage during the countermovement jump.
该研究通过评估咬牙紧咬及其对反向纵跳过程中力发展速率（RFD）、达到峰值力的时间（TTPF）和峰值力（PF）的影响，来评估当前激活增强的效果。14名受试者在测力平台上进行反向纵跳，同时在牙科乙烯基护齿器上最大程度地咬紧牙关（咬牙紧咬组），以及通过张嘴跳跃不咬紧牙关（非咬牙紧咬组）。结果显示，与非咬牙紧咬组相比，咬牙紧咬组的力发展速率高19.5%（p<0.05）。与非咬牙紧咬组相比，咬牙紧咬组达到峰值力的时间少20.15%（p<0.05）。咬牙紧咬组和非咬牙紧咬组之间的峰值力无显著差异（p=0.60）。这些发现表明，在反向纵跳过程中，同时激活增强通过咬牙紧咬得以体现。因此，运动员可能会采用这种最大程度咬紧牙关的策略，在反向纵跳过程中获得运动能力提升的优势。
