Muscle fatigue and metabolic responses following three different antagonist pre-load resistance exercises

作者：Carregaro Rodrigo^*; Cunha Rafael; Oliveira Carlos Gomes; Brown Lee E; Bottaro Martim

来源：Journal of Electromyography and Kinesiology, 2013, 23(5): 1090-1096.

DOI：10.1016/j.jelekin.2013.04.010

• Electromyography
• Isokinetic
• Knee joint
• Resistance exercise

Purpose: Preload of antagonist muscles can be achieved by reciprocal actions (RAs) or by opposing muscle actions. However, evidence concerning neuromuscular and fatigue responses are scarce. %26lt;br%26gt;Objective: To compare the effects of different knee flexor (KF) preload methods on knee extension (KE) vastus medialis muscle fatigue, based on EMG-spectral index (FI), load range (LR), total work (TW), blood lactate (LAC) and biceps femoris co-activation (BFc) during resistance exercise. %26lt;br%26gt;Methods: Twenty-four healthy men (23.5 +/- 3.6 yrs) performed three antagonist pre-load isokinetic exercises (4 sets, 10 repetitions, 60 degrees s(-1), 1 min rest between sets): RA (KF contraction immediately followed by KE); Superset (SS; one KF set immediately followed by one KE set); Multiple Set (MS; four KF sets followed by four KE sets). %26lt;br%26gt;Results: Total work was significantly greater in RA. There was no significant decrease in LR between sets in RA. The BFc did not differ between protocols (p = 0.063). However, RA presented greater biceps femor-iscoactivation. The FI was greater during SS compared to RA and MS (p %26lt; 0.05). The SS had greater LAC when compared to MS and RA (p = 0.005 and p = 0.007, respectively). %26lt;br%26gt;Conclusion: It is suggested that the RA protocol is more neuromuscular and metabolic efficient during the performance of knee extension resistance exercise.

• 出版日期2013-10