| Previous research relating to Alpha-GPC supplementation and physical performance has been limited to researching Alpha-GPC as a single ingredient supplement. Further research is needed to investigate the effect of Alpha-GPC in combination with other ergogenic ingredients on physical performance. Purpose: The purpose of this study was to investigate the acute effect of Myosync(TM) on physical performance in Division II football players. Methods: Fourteen male Division II football players (20.4 +/- 1.0 years; 191.4 +/- 5.5 cm; 106.9 +/- 16.4 kg) participated in a randomized double blind crossover experiment separated by at least seven days. Subjects were given Myosync(TM) (2 Capsules, 1,076 mg) or a placebo control (2 capsules of fiber) 60 minutes prior to any physical testing measures. Testing consisted of, maximum vertical jumps, maximum voluntary isometric contractions (MVIC), maximal voluntary concentric contractions (MVCC), and fatiguing contractions for the knee extensor muscles. Subjects performed three maximum vertical jumps with one-minute rest between jumps. Three MVICs were performed with the knee extensor muscles while seated on a dynamometer at 90° of hip flexion and knee flexion, with 2-minute rest between trials. Seven sets of two MVCCs at various loads (1 Nm; 10%, 20%, 30%, 40%, 50% and 60% MVIC torque) were completed with 30-seconds of rest between each set. During the fatiguing tasks, 120 MVCCs (4 set x 30 reps) were performed with a load equivalent to 20% MVIC through 60 degree range of motion. Recovery measures were taken 10 minutes post completion of fatiguing task and consisted of one MVIC and MVCCs using the same loads as pre-fatiguing task. Results: There was no difference in maximum vertical jump height between control and supplemental sessions (70.8 +/- 6.6 vs 70.9 +/- 6.2 cm, P = 0.90). MVIC was similar between control and supplemental sessions at baseline (297.8+/- 48.4 vs. 296.7 +/- 70.5 Nm, respectively, P = 0.34). Rate of torque development (highest slope of torque during the first 400 ms during MVIC was significantly higher throughout the fatiguing task during the supplemental session (P = 0.02). Impulse for all MVIC significantly increased at 200 ms throughout the fatiguing task during the supplemental session (P < 0.001). No significant differences seen between peak power during isotonic contractions as well as fatigability between sessions. Conclusion: Maximal strength, power and vertical jump did not improve with Myosync(TM), however, the significant increases in rate of torque development and impulse could be beneficial for a variety of athletes. |
