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document
Acute effects of different stretching durations on passive torque , mobility , and isometric muscle force . Static stretching is widely applied in various disciplines . However , the acute effects of different durations of stretching are unclear . Therefore , this study was designed to investigate the acute effects of different stretching durations on muscle function and flexibility , and provide an insight into the optimal duration of static stretching . This randomized crossover trial included 24 healthy students ( 17 men and 7 women ) who stretched their right hamstrings for durations of 20 , 60 , 180 , and 300 seconds in a random order . The following outcomes were assessed using an isokinetic dynamometer as markers of lower-limb function and flexibility : static passive torque ( SPT ) , dynamic passive torque ( DPT ) , stiffness , straight leg raise ( SLR ) , and isometric muscle force . Static passive torque was significantly decreased after all stretching durations ( p < 0.05 ) . Static passive torque was significantly lower after 60 , 180 , and 300 seconds of stretching compared with that after 20-second stretching , and stiffness decreased significantly after 180- and 300-second stretching ( p < 0.05 ) . In addition , DPT and stiffness were significantly lower after 300 seconds than after 20-second stretching ( p < 0.05 ) , and SLR increased significantly after all stretching durations ( p < 0.05 ) . Straight leg raise was higher after 180- and 300-second stretching than after 20-second stretching and higher after 300-second stretching than after 60-second stretching ( p < 0.05 ) . Isometric muscle force significantly decreased after all stretching durations ( p < 0.05 ) . Therefore , increased duration of stretching is associated with a decrease in SPT but an increase in SLR . Over 180 seconds of stretching was required to decrease DPT and stiffness , but isometric muscle force decreased regardless of the stretching duration . In conclusion , these results indicate that longer durations of stretching are needed to provide better flexibility .
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Intervention_Physical
stretching durations
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Intervention_Physical
Static stretching
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Intervention_Physical
stretching
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Intervention_Physical
different stretching durations
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Intervention_Physical
static stretching
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Intervention_Physical
stretched
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Intervention_Physical
stretching
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Intervention_Physical
stretching
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Intervention_Physical
20-second stretching
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Intervention_Physical
180- and 300-second stretching
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Intervention_Physical
20-second stretching
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Intervention_Physical
stretching
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Intervention_Physical
300-second stretching
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Intervention_Physical
20-second stretching
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Intervention_Physical
300-second stretching
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Intervention_Physical
60-second stretching
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Intervention_Physical
stretching durations
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Intervention_Physical
stretching
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Intervention_Physical
180 seconds of stretching
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Intervention_Physical
stretching duration
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Intervention_Physical
stretching
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Outcome_Physical
passive torque , mobility , and isometric muscle force .
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Outcome_Physical
lower-limb function and flexibility : static passive torque ( SPT ) , dynamic passive torque ( DPT ) , stiffness , straight leg raise ( SLR ) , and isometric muscle force . Static passive torque
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Outcome_Physical
Static passive torque
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Outcome_Physical
DPT and stiffness
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Outcome_Physical
Straight leg raise
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Outcome_Physical
Isometric muscle force significantly decreased
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Outcome_Physical
SPT
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Outcome_Physical
DPT and stiffness
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Participant_Sample-size
24
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Participant_Sample-size
17
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Participant_Sex
men
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Participant_Sample-size
7
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Participant_Sex
women
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Participant_Condition
stretched their right hamstrings