The effects of three time periods (5, 10 and 15 seconds) of isometric contraction in PNF method on range of hamstring stretch in non-athletes men

Ebrahim, Khosro; Nourshahi, Maryam; Taheri, Abdolhossein; Nikseresht, Mahmood

doi:10.48308/joeppa.2009.98525

The effects of three time periods (5, 10 and 15 seconds) of isometric contraction in PNF method on range of hamstring stretch in non-athletes men

Document Type : original article

Authors

10.48308/joeppa.2009.98525

Abstract

Purpose: The purpose of this study was to investigative the effects of three time periods of 5, 10,
and 15 seconds of maximum voluntary isometric contraction (MVIC) in the slow-reversal-holdrelax
stretching technique on hamstring flexibility in non-athletes men. Methods: Thirty nonathlete
men (Mean±SD; age, 20±2.1years; body mass, 68±6.3 kg; height, 171±5.1 cm) were
randomly assigned to one of the three training groups: 5s-MVIC, 10s-MVIC, and 15s-MVIC.
Measurements of hamstring stretch were performed at the beginning and at the end of six weeks of
training by researcher using a goniometer and SLR test. Training program included one set of
stretch training (SRHR-PNF) with three repetitions per set and three sessions per week for 6 week.
The training increased to three sets with three repetitions at the end of the program. At the end of
training period, rate of hamstring stretch was measured using SLR test. Data were analyzed using
dependent t-test and one-way ANOVA. Results: Data analysis showed significant increases in
hamstring flexibility for three groups. However, no significant difference between groups was
found (P0.05). Conclusions: according to the findings of the present study it could be concluded
that a longer MVIC time dose not lead to a greater increase in flexibility

Keywords

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