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

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


1- Feland JB, Marin HN. (2004). Effect of
submaximal contraction intensity in contractrelax
proprioceptive neuromuscular facilitation
stretching. Br J Sprots Med. 38: 18.
2- Marek SM, Cramer JT, Fincher AL, Massey LL,
Dangelmaier SM, Purkayastha S, Fitz KA,
Culbertson JY. (2005). Acute effects of static
and proprioceptive neuromuscular facilitation
stretching on muscle strengh and power output. J
Athl Train. 40:94-103.
3- Rowlands AV, Marginson VF, Lee J. (2003).
Chronic Flexibility Gains: effect stretching of
isometric contraction duration during
proprioceptive neuromuscular facilitation
techniques . Res Qua Exe Sport. 74:47-51.
4- Schmitt GD, pelham TW, Holt LE. (1999). A
comparison of selected protocols during
proprioceptive neuromuscular facilitation
stretching.Clin Kinesiol. 53:16-21.
5- Schuback B, Hooper J, Salisbury L. (2004). A
compaeison of a self-stretch incorporating
proprioceptive neuromuscular facilitation
components and a therapiet-applied PNF
technique on hamstring flexibility. J
Physiotherapy. 90:151-7.
6- Spernoga SG, Uhl TL, Arnold BL, Gansneder
BM. (2001). Duration of maintained hamstring
flexibility after a one-time, modified hold-relax
stretching protocol .J Athl Train. 36:44-8.
7- Sullivan Mk, Dejulia JJ, Worrell TW. (1992).
Effect of pelvic position and stretching method
on hamstring muscle flexibility . Med Sci Sports
Exerc. 24:1383-9.
8- Zakas A,Vergou A, Grammaticopoulou MG,
Zakas N, Sentelidis T, Vamvakoudis S. (2003).
The effect of sretching during warming-up on the
flexibility of junior handball players. J Sports
Med Phys Fitness. 43:145-9.
9- Burke DG, Holtt LE, Rasmussen R, Mackinnont
NC, Vossen JF, Pelhamt TN. (2001). Effects of
Hot or cold water immersion and Modified
proprioceptive neuromuscular facilitation
flexibility exercise on hamstring length . J Athl
Train. 36:16-19.
10- Feland JB, Myrer JW, Merrill RM. (2001).
Acute change in hamstring flexibility: PNF
versus static in senior athlets. Phy Ther Sport.
2:186-193.
11- Bonnar BP, Deivert RG, Gould TE. (2004). The
relationship between isometric contraction
durations during hold-relax stretching and
improvement of hamstring flexibility.J Sports
Med Phys Fitness. 44:258-61.
12- Burke DG, Culligan CJ, Holt LE. (2000). The
teoretical basis of proprioceptive neuromuscular
facilitation. J Strength Con Res.14:496-500.
13- Ferber R, Ostering LR, Gravelle DC. (2002).
Effect of PNF stretch techniques on knee flexor
muslce EMG activity in older adults. J
Eloctromyo Kinsiol. 12(5) : 391-7.
14- Nelson KC, Cornelius WL. (1991). The
relationship between isometric contraction
duration and improvement in shoulder joint
range of motion . J Sports Med Phys Fitness.
31:385-8.
15- Ostering LR, Robertson RN, Troxel RK, Hansen
P. (1990). Differential responses to
proprioceptive neuromuscular facilitation (PNF)
stretch techniques . Med Sci Sports Exerc.
22:106-111.
16- Hardy L. (1985). Improving active range of hip
flextion.Res Quart Exer Sport. 56(2): 111-4.
17- Wallin D, Ekblom B, Grahn R et al. (1985).
Improvement of muscle flexibility a comparison
between two techniques . Am J Sports Med.
13:263-8.
18- Kisner C, Colby LA.(1996). Therapeutic
exercise foundations and techniques. 3rt ed.
Philadelphia, PA: F.A. Davis Company.
19- Cornelius WL, Rauschubler MR. (1987). The
relationship between isometric contraction
187 ....4     PNF  & 

durations and improvment in acute hip joint
flexibility. J Appl Sport Sci Res. 1:39-41
20- Hardy L, Jones D. (1986). Dynamic flexibility
and proprioceptive neuromuscular facilitation.
Res Q Exerc Sports. 57(2):150-3.
21- Carmine C. (2002). PNF stretching. Am Fitness.
20:37-40.
22- Davis DS, Quinn RO, Whiteman CT. Williams
JD and Yaung CR. (2008). Concurrent validity
of four clinical tests used measure hamstring
flexibility. J Strength Cond Res. 22: 583-8.
23- Alter MJ. (1996). Science of flexibility . Human
Kinetics. PP: 4-6.
24- Bohannon RW, Gajdosic RL, Leveau BF.
(1985). Relationship of pelvic and thigh motion
during unilateral and bilateral hip flexion. Phys
The. 65: 474 – 6.
25- Gajdosik RL, Leveau BF, Bohannon RW.
(1985). Effect of ankle dorsiflexion on active and
psssive unilateral straight leg raising. Phys Ther.
65(10) : 1478-82.
26- Hamil J, Knutzen KM. (2003). Biomechanical
basis of human movement.2 ed. Lippincott
Williams and Wilkins
  • Receive Date: 17 May 2015
  • Revise Date: 25 May 2024
  • Accept Date: 31 December 2020
  • First Publish Date: 31 December 2020
  • Publish Date: 23 July 2009