التفاصيل البيبلوغرافية
| العنوان: |
Effects of resistance training in humans on neck muscle performance, and electromyogram power spectrum changes. |
| المؤلفون: |
Portero, Pierre, Bigard, André-Xavier, Gamet, Didier, Flageat, Jean-René, Guézennec, Charles-Yannick |
| المصدر: |
European Journal of Applied Physiology; Jun2001, Vol. 84 Issue 6, p540-546, 7p |
| مصطلحات موضوعية: |
ISOMETRIC exercise, NECK, MUSCLES, ELECTROMYOGRAPHY, FATIGUE (Physiology), POWER spectra |
| مستخلص: |
The purpose of this study was to quantify the neuromuscular cervical adaptations to an 8 week strength training programme. Seven healthy men, with no pathological conditions of the neck, performed a lateral flexion isometric resistance-training programme three times a week. The training sessions consisted of one set of ten contractions, each of 6 s duration, at 60% of the predetermined maximal voluntary isometric torque (MVTim) (warm-up) and two sets of eight contractions, each of 6 s duration, at 80% MVTim. The training effects were evaluated in three ways: muscle size, strength and fatigability. The cross-sectional areas (CSA) of the trapezius (TRP) and sternocleidomastoideus (SCM) muscles were determined using a computerised tomographic scanner. Results showed an increase in the CSA of TRP and SCM muscles after training, 8.8% at C5 level and 6.4% at C7 level for SCM muscle and 12.2% at C7 level for TRP muscle. Strength increased significantly under both isometric and isokinetic conditions (35% and 20%, respectively). Muscle fatigability in lateral flexion was quantified during a sustained isometric contraction at 50% of MVTim. The shift of the mean power frequency of the electromyogram power spectrum density function of SCM muscle toward lower frequencies was less after training (14.6% compared to 6.8%). These results indicate the beneficial effect of a strength-training programme which increases neck muscle size and strength during lateral flexion, and decreases the fatigability of the superficial muscles of the neck. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
