중량부하방법에 따른 펙덱 운동 후 벤치프레스 운동시 주동근의 iEMG, MEF 및 근력 비교

The Effect of Adaptation of Exercise Intensity on Agonist iEMG, MEF, and Muscular Strength on the Supine Bench Press after Pec Deck

[서론] 본 연구의 목적은 중량부하방법에 따른 펙덱 all-out 선행운동(사전 탈진)을 실시한 후 벤치프레스 운동을 실시하였을 때 나타나는 근전도 반응(iEMG, MEF)과 근력발현의 차이를 검증하는데 있다. [방법] 본 연구의 대상은 저항운동 경험이 6개월 정도인 7명의 남자대학생을 선정하여 1RM을 측정한 다음 본 연구에서 제시된 중량부하강도에 따른 근전도 반응, 펙덱 선행운동 후 10RM 벤치프레스 운동 시 주동근에 나타나는 근전도 반응과 근력발현의 정도를 측정하여 종속 t-test와 급내설계 one-way ANOVA 및 사후비교(contrast)로 분석하였다. [결과] 대흉근의 iEMG는 [펙덱 50%10RM X 벤치프레스 10RM ] 조건이 벤치프레스 10RM ] 조건보다 통계적으로 높았다(p< .05). 상완삼두근의 외측두의 iEMG는 [벤치프레스 10RM ] 조건이 [펙덱 10RM X 벤치프레스 10RM ] 조건과 [펙덱 50%10RM X 벤치프레스 10RM ] 조건보다 통계적으로 낮게 나타났다(p< .05, p< .000). 대흉근의 MEF는 [벤치프레스 10RM 실시] 조건이 [펙덱 10RM X 벤치프레스 10RM ] 조건과 [펙덱 50%10RM X 벤치프레스 10RM] 조건보다 통계적으로 낮았고(p< .05, p< .000), 상완삼두근 장두의 MEF는 [펙덱 50%10RM X 벤치프레스 10RM ] 조건이 [벤치프레스 10RM ] 조건보다 통계적으로 높았다(p< .05). 벤치프레스 10RM 실행 횟수는 [펙덱 50%10RM X 벤치프레스 10RM 실시] 조건이 [펙덱 10RM X 벤치프레스 10RM ] 조건보다 통계적으로 낮게 나타났다(p< .05). [결론] 이상의 결과를 종합해 볼 때, 벤치프레스 운동시 대흉근의 근피로도가 높을 때는 상완삼두근의 iEMG가 높아지는 보상효과가 있는 것으로 사료된다.

[INTRODUCTION] The purpose of this study was to examine the effects of exercise intensity on agonist muscle activation, muscle fatigue, and muscular strength on the bench press. [METHOD] Seven healthy college age students participated in this study. All subjects were tested for their one repetition maximum(RM) strength on the supine bench press. Surface electrodes were at-tached on the belly of the pectoralis major and the bellies of the triceps brachii; long, medial, and lateral head. Normalized iEMG and MEF were collected and compared to three sites on the triceps brachii and measured iEMG and MEF according to the intensity resistance training loading method. One-way ANOVA repeated meas-urement and t-test were used to identify significant differences between single and multi-joint exercises on the different intensity variables. An alpha level of .05 was used to determine the significance level. [RESULT] 1.the result of the 10RM after pectoralis major single joint all-out pre exercise on the exercise load method showed [bench press 10RM after pec dec 50% 10RM all-out exercise] was higher than [bench press 10RM without pre exercise] in the iEMG of pectoralis major(p<.05). The [bench press 10RM without pre exercise] was lower than [bench press 10RM after pec deck 10RM all out exercise] and [bench press 10RM after pec deck 50% 10RM all out exercise] in the iEMG of the lateral head of the triceps brachii(p<.05, p<.001). The MEF of the pectoralis ma-jor on bench press 10RM after pre fatigue exercise showed [bench press 10RM without pre exercise] which was lower than [bench press 10RM after pec deck 10RM all out exercise] and [bench press 10RM after pec deck 50% 10RM all out exercise] (p<.05, p<.001). The long head of the triceps brachii showed [bench press 10RM after pec deck 50% 10RM all out exercise] which was higher than [bench press 10RM without pre exercise] in the EMF(p<.05). 2. the practice number of bench press 10RM after single joint all-out pre exercise on exercise load method showed [bench press 10RM after pec dec 50% 10RM all out exercise] which was lower than [bench press 10RM after pec deck 10RM all out exercise] (p<.05). [CONCLUSION] When the muscle fatigue(MEF) of pectoralis major was high, the muscle activity(iEMG) of triceps brachii became high.