Effects of Dynamic Stretching on Strength, Muscle Imbalance, and Muscle Activation.

• Autores: Pablo B. Costa, Joel T. Cramer, Trent J. Herda, Ashley A. Herda
• Localización: Medicine & Science in Sports & exercise: Official Journal of the American College of Sports Medicine, ISSN 0195-9131, Vol. 46, Nº. 3, 2014, págs. 586-593
• Idioma: inglés
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• Dialnet Métricas: 1 Cita
• Resumen

  • AB Purpose: This study aimed to examine the acute effects of dynamic stretching on concentric leg extensor and flexor peak torque, eccentric leg flexor peak torque, and the conventional and functional hamstring-quadriceps (H:Q) ratios. Methods: Twenty-one women (mean +/- SD age = 20.6 +/- 2.0 yr, body mass = 64.5 +/- 9.3 kg, height = 164.7 +/- 6.5 cm) performed maximal voluntary isokinetic leg extension, flexion, and eccentric hamstring muscle actions at the angular velocities of 60[degrees][middle dot]s-1 and 180[degrees][middle dot]s-1 before and after a bout of dynamic hamstring and quadriceps stretching as well as a control condition. Results: Leg flexion peak torque decreased under both control (mean +/- SE for 60[degrees][middle dot]s-1 = 75.8 +/- 4.0 to 72.4 +/- 3.7 N[middle dot]m, 180[degrees][middle dot]s-1 = 62.1 +/- 3.2 to 59.1 +/- 3.1 N[middle dot]m) and stretching (60[degrees][middle dot]s-1 = 73.1 +/- 3.9 to 65.8 +/- 3.3 N[middle dot]m, 180[degrees][middle dot]s-1 = 61.2 +/- 3.3 to 54.7 +/- 2.6 N[middle dot]m) conditions, whereas eccentric hamstring peak torque decreased only after the stretching (60[degrees][middle dot]s-1 = 87.3 +/- 5.1 to 73.3 +/- 3.6 N[middle dot]m, 180[degrees][middle dot]s-1 = 89.2 +/- 4.4 to 77.0 +/- 3.4 N[middle dot]m) intervention (P <= 0.05). Stretching also caused a decrease in conventional H:Q (60[degrees][middle dot]s-1 = 0.58 +/- 0.02 to 0.54 +/- 0.02, 180[degrees][middle dot]s-1 = 0.67 +/- 0.02 to 0.61 +/- 0.03) and functional H:Q ratios (60[degrees][middle dot]s-1 = 0.69 +/- 0.03 to 0.60 +/- 0.03, 180[degrees][middle dot]s-1 = 1.00 +/- 0.06 to 0.60 +/- 0.03) (P <= 0.05). Conclusions: Because dynamic stretching reduced concentric and eccentric hamstring strength as well as the conventional and functional H:Q ratios, fitness and allied-health professionals may need to be cautious when recommending dynamic rather than static stretching to maintain muscle force