التفاصيل البيبلوغرافية
| العنوان: |
SIMILAR NEUROMUSCULAR FATIGUE BUT DIFFERENT NEURAL RESPONSES WITH ACUTE HYPERTROPHY EXERCISE IN MALES AND FEMALES. |
| المؤلفون: |
Latella, Christopher, Hendy, Ashlee, VanderWesthuizen, Dan, Wei-Peng Teo |
| المصدر: |
Journal of Australian Strength & Conditioning; 2017, Vol. 25 Issue 6, p36-36, 1p |
| مصطلحات موضوعية: |
HYPERTROPHY, EXERCISE physiology, RESISTANCE training, RECTUS femoris muscles, TRANSCRANIAL magnetic stimulation |
| مستخلص: |
INTRODUCTION: Resistance training forms an integral part of strength and conditioning practice, facilitating adaptations in neuromuscular performance. In particular, hypertrophic training (HYT) is employed in the early stages of a macro-cycle; to increase muscular size and in preparation for higher intensity strength and power programming. Although early strength increases are largely governed by neural adaptations it remains unclear how the central nervous system (CNS) responds to a single session of HYT exercise. Furthermore, the sex differences in response to applied resistance training remain poorly understood. Therefore, we compared the neural and neuromuscular responses during fatigue and recovery of males and females following a single session of HYT. METHODS: 22 participants (12 male, 10 female) completed one session of HYT consisting of (3x12 repetition maximum [RM]) unilateral leg extensions with 60 sec recovery between sets. Single- and paired-pulse transcranial magnetic stimulation (TMS) was used to measure CNS excitability (EXC), inhibition (INH), and voluntary activation (VA). Maximal muscle compound wave (MMAX) of the rectus femoris (RF) and maximal voluntary isometric contraction (MVIC) of the leg extensors assessed neuromuscular function. Acute fatigue and recovery were tracked immediately post training, at 30min, 1, 2 and up to 6hrs post-training. RESULTS: The results showed MVIC was decreased from baseline but not different between groups (P=0.585) at post-training and 30min, with a similar reduction in MMAX at 30 min between males and females (P=0.917). However, CNS measures showed a greater reduction in the INH for males (P=0.023) and an increased EXC for females (P=0.011) immediately post-training. No changes were observed for VA (P>0.05). DISCUSSION: Although neuromuscular fatigue and recovery were similar between males and females, the modulation of the CNS during this period appears to be sex specific. The integrity of VA in conjunction with a net increase in CNS output (increased excitability, decreased inhibition) provide evidence for a central compensatory mechanism in an attempt to attenuate neuromuscular fatigue. Furthermore, the return of neuromuscular and neural measures toward baseline following a single-joint HYT exercise occur rapidly, indicating a shortened time course of fatigue and recovery than previously suggested in strength and conditioning literature. PRACTICAL APPLICATIONS: Neuromuscular fatigue and recovery from dynamic HYT occurs similarly between males and females. However, the CNS differences offer novel information regarding the underlying mechanisms of central compensation during neuromuscular fatigue and should be considered in future research investigations. From an applied perspective, the neuromuscular findings suggest that both males and females undertaking dynamic HYT should be programmed in a similar fashion. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
