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

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 center dot s(-1) and 180 degrees center 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 center dot s(-1) = 75.8 +/- 4.0 to 72.4 +/- 3.7 N center dot m, 180 degrees center dot s(-1) = 62.1 +/- 3.2 to 59.1 +/- 3.1 N center dot m) and stretching (60 degrees center dot s(-1) = 73.1 +/- 3.9 to 65.8 +/- 3.3 N center dot m, 180 degrees center dot s(-1) = 61.2 +/- 3.3 to 54.7 +/- 2.6 N center dot m) conditions, whereas eccentric hamstring peak torque decreased only after the stretching (60 degrees center dot s(-1) = 87.3 +/- 5.1 to 73.3 +/- 3.6 N center dot m, 180 degrees center dot s(-1) = 89.2 +/- 4.4 to 77.0 +/- 3.4 N center dot m) intervention (P <= 0.05). Stretching also caused a decrease in conventional H:Q (60 degrees center dot s(-1) = 0.58 +/- 0.02 to 0.54 +/- 0.02, 180 degrees center dot s(-1) = 0.67 +/- 0.02 to 0.61 +/- 0.03) and functional H:Q ratios (60 degrees center dot s(-1) = 0.69 +/- 0.03 to 0.60 +/- 0.03, 180 degrees center 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.