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Med Sci Sports Exerc. 2008 Mar;40(3):566-73. doi: 10.1249/MSS.0b013e31815d2f8c.

Effect of stretching on strength loss and pain after eccentric exercise.

Author information

1
Nicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital, New York, NY 10021, USA. mchugh@nismat.org

Abstract

PURPOSE:

The purposes of the this study were to determine whether stretch-induced strength loss was muscle length dependent (study 1) and whether passive stretching prior to eccentric exercise affected strength loss and pain on subsequent days (study 2).

METHODS:

For study 1, knee flexion strength was measured isometrically (six angles) and isokinetically (eccentric and concentric) in 10 men (33 +/- 9 yr). The subjects then performed six 90-s static hamstring stretches, after which isometric and isokinetic strength were retested. For study 2, the dominant and nondominant legs of eight men (34 +/- 9 yr) were assigned to a stretch (six 60-s stretches) or control condition prior to eccentric hamstring exercise. Isometric strength and pain were assessed prior to, immediately after, and on the 3 d after exercise.

RESULTS:

After stretching, strength was decreased by 17% at 80 degrees , 11% at 65 degrees , 5% at 50 degrees , 7% at 35 degrees , and 8% at 20 degrees , and it was increased by 6% at 5 degrees (angle effect P < 0.01). Strength loss following eccentric exercise was less on the stretched versus the unstretched control limb at 37 degrees (P < 0.05), but not at other angles (stretch by time by angle P < 0.01). Pain was not different between the stretched and the unstretched control limb (P = 0.94).

CONCLUSION:

Stretch-induced strength loss was dependent on muscle length, such that strength was decreased with the muscle group in a shortened position, but not with the muscle group in a lengthened position. Strength loss and pain after eccentric exercise were generally unaffected by prior stretching, with the exception that stretching prevented strength loss when assessed with the muscle in a lengthened position.

PMID:
18379222
DOI:
10.1249/MSS.0b013e31815d2f8c
[Indexed for MEDLINE]
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