التفاصيل البيبلوغرافية
| العنوان: |
KINEMATICS AND MUSCLE ACTIVATION AROUND THE STICKING REGION IN FREE-WEIGHT BARBELL BACK SQUATS. |
| العنوان البديل: |
KINEMATIKA IN MIŠIČNA AKTIVACIJA OKROG OBMOČJA PREVELIKEGA ODPORA PRI POČEPIH Z BREMENOM ZADAJ MED DVIGOVANJEM UTEŽI. (Slovenian) |
| المؤلفون: |
van den Tillaar, Roland |
| المصدر: |
Kinesiologia Slovenica; 2015, Vol. 21 Issue 1, p15-25, 11p, 2 Charts, 4 Graphs |
| مصطلحات موضوعية: |
ELECTROMYOGRAPHY, HIP joint, RANGE of motion of joints, KINEMATICS, KNEE, QUADRICEPS muscle, BODY movement, GLUTEAL muscles, SKELETAL muscle, RECTUS femoris muscles, RESISTANCE training, PLANTARFLEXION |
| الملخص (بالإنجليزية): |
The purpose of this study was to investigate 3D kinematics and muscle activation around the sticking region (the weakest region) in full back squats. Eleven resistance-training males (age 23.5 ± 2.6 years, body mass 86.8 ± 21 kg, body height 1.81 ± 0.08 m) performed 6-RM full squats and the last repetition was taken for further analyses of 3D kinematics and EMG activity around the sticking region. The main findings were that all participants exhibited a sticking region during the last repetition of the 6-RM squatting. The rectus femoris activity decreased in each region from the pre-sticking to the sticking region, the lateral vastus only decreased from the sticking to the post-sticking region, while a significant increase in EMG activity was found for the glutei muscles from the pre-sticking to the sticking region. In addition, the timing of the peak and minimal angular velocities of the hip extension, knee extension and plantar flexion movements were concomitant with the two peak velocities and minimal velocity of the barbell. It is suggested that the timing and activity between the knee extensors (lateral vastus, rectus femoris) and the gluteus maximus are responsible for the existence of the sticking region together with the large joint moment arms in this region. [ABSTRACT FROM AUTHOR] |
| Abstract (Slovenian): |
Namen te raziskave je bil raziskati 3D kinematiko in mišično aktivacijo v območju prevelikega odpora (najšibkejše območje) pri počepih z bremenom zadaj med dvigovanjem uteži. Enajst moških, ki se ukvarjajo z vadbo z uporom (starost: 23,5 ± 2,6 let, telesna masa: 86,8 ± 21 kg, telesna višina: 1,81 ± 0,08 m) je izvedlo počepe 6-RM, zadnja ponovitev pa je bila upoštevana v nadaljnji analizi 3D kinematike in EMG aktivnosti v območju prevelikega odpora. Glavne ugotovitve so bile, da so vsi merjenci doživeli območje prevelikega odpora pri zadnji ponovitvi počepov 6-RM. Aktivnost mišice rectus femoris se je zmanjšala v vsakem območju pred in po območju prevelikega odpora, aktivnost mišice lateral vastus se je znižala samo od območja prevelikega odpora do območja, ki mu sledi, medtem ko je bilo pomembno zvišanje aktivnosti EMG pri mišicah iz skupine gluteus zabeleženo v območju pred in do območja prevelikega odpora. Poleg tega sta največja in najmanjša kotna hitrost iztegovanja kolka in kolena ter upogibanja stopala sovpadli z dvema največjima hitrostima in najmanjšo hitrostjo uteži. Vse kaže, da sta časovna uskladitev in aktivnost mišic iztegovalk kolena (lateral vastus, rectus femoris) in mišice gluteus maximus odgovorni za pojav območja največjega odpora, skupaj z velikimi ročicami momenta v sklepih v tem območju. [ABSTRACT FROM AUTHOR] |
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