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J Orthop Sports Phys Ther. 2008 Oct;38(10):632-9. doi: 10.2519/jospt.2008.2843.

The time course of musculotendinous stiffness responses following different durations of passive stretching.

Author information

1
Biophysics Laboratory, Department of Health and Exercise Science, University of Oklahoma, Norman, OK 73019-6081, USA.

Abstract

STUDY DESIGN:

Repeated-measures experimental design.

OBJECTIVE:

To examine the acute effects of different durations of passive stretching on the time course of musculotendinous stiffness (MTS) responses in the plantar flexor muscles.

BACKGROUND:

Stretching is often implemented prior to exercise or athletic competition, with the intent to reduce the risk of injury via decreases in MTS.

METHODS AND MEASURES:

Twelve subjects (mean +/- SD age, 24 +/- 3 years; stature, 169 +/- 12 cm; mass, 71 +/- 17 kg) participated in 4 randomly-ordered experimental trials: control with no stretching, 2 minutes (2min), 4 minutes (4min), and 8 minutes (8min) of passive stretching. The passive-stretching trials involved progressive repetitions of 30-second passive stretches, while the control trial involved 15 minutes of resting. MTS assessments were conducted before (prestretching), immediately after (poststretching), and at 10, 20, and 30 minutes poststretching on a Biodex System 3 isokinetic dynamometer.

RESULTS:

MTS decreased (P<.05) immediately after all stretching conditions (2min, 4min, and 8min). However, MTS for the 2min condition returned to baseline within 10 minutes, whereas MTS after the 4min and 8min passive-stretching conditions returned to baseline within 20 minutes.

CONCLUSIONS:

Practical durations of passive stretching resulted in significant decreases in MTS; however, these changes return to baseline levels within 10 to 20 minutes.

PMID:
18827325
DOI:
10.2519/jospt.2008.2843
[Indexed for MEDLINE]

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