Document Type: Original Articles
Assistant Professor, Department of Physiotherapy, School of Rehabilitation Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
Student Research Committee, Department of Physiotherapy, School of Rehabilitation Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
Background: Previous studies have investigated different effects of muscle fatigue on body systems. However, there are no reports on the effect of fatigue protocol and its level on musculotendinous stiffness (MTS) of the tricep-surae. This study was designed to compare the effects of 2 levels of submaximal fatigue contraction on MTS of triceps-surae.Methods: Twenty female students by simple randomized sampling participated in this study. Triceps-surae musculotendinous stiffness was measured before and after two fatigue protocols. The fatigue protocols were comprised of a continuous isometric voluntary plantar flexion contraction (25% and 70% maximum voluntary contraction) until the contraction could no longer be maintained. The free oscillation technique was used to measure MTS of the triceps-surae. A Kistler force plate was used to measure the force applied.Results: Musculotendinous stiffness decreased immediately after both fatigue protocols (P value ≤ 0.05). Data analysis with RM ANOVA showed that there was no significant difference between the two protocols with respect to the decrease in MTS stiffness of the triceps-surae. Moreover, the decrease in stiffness did not change for 15 min after the two fatigue protocols (P>0.05).Conclusion: Musculotendinous stiffness of the triceps-surae decreased significantly after both fatigue protocols, and there was no significant difference between the two protocols with respect to change in triceps-surae musculotendinous stiffness. This result may be due to similar type of contraction in protocols, the learning effect, or the effect of central fatigue.
- Owen G, Cronin J, Gill N, McNair P. Knee extensor stiffness and functional performance. Phys Ther Sport 2005; 6(1): 38-44.
- Lichtwark G, Wilson A. Is Achilles tendon compliance optimised for maximum muscle efficiency during locomotion? J biomech 2007; 40(8): 1768-75.
- Faria A, Gabriel R, Abrantes J, Bras R, Moreira H, The relationship of body mass index, age and triceps-surae musculotendinous stiffness with the foot arch structure of postmenopausal women. Clin Biomech 2010; 25(6): 588-93.
- Lichtwark G, Wilson A. Optimal muscle fascicle length and tendon stiffness for maximising gastrocnemius efficiency during human walking and running. Journal of theoretical biology. 2008; 252(4): 662-73.
- Vigreux B, Cnockaert J, Pertuzon E. Effects of fatigue on the series elastic component of human muscle. Eur. J. App. Physiol. Occu Physiol 1980; 45: 11â7.
- Zhang L, Rymer W. Reflex and intrinsic changes induced by fatigue of human elbow extensor muscles. J Neurophysiol 2001; 36: 1086â94.
- Hunter I, Kearney R. Invariance of ankle dynamic stiffness during fatiguing muscle contractions. J Biomech 1983; 16: 985â91.
- Blackburn JT, Bell DR, Norcross MF, Hudson JD, Engstrom LA. Comparison of hamstring neuromechanical properties between healthy males and females and the influence of musculotendinous stiffness. J Electromyogr Kinesiol 2009;19:e362âe9.
- Blackburn JT, Padua DA, Weinhold P S, Guskiewicz KM. Comparison of triceps surae structural stiffness and material modulus across sex. Clin Biomech 2006; 21: 159â67.
- Hunter DG, Spriggs J. Investigation into the relationship between the passive flexibility and active stiffness of the ankle plantarâflexor muscles. Clin Biomech 2000; 15(8): 600â6.
- Mademli L, Adamantios A, Walsh M. Effect of muscle fatigue on the compliance of the gastrocnemius medialis tendon and aponeurosis. J Biomech 2006; 39: 426-34.
- Murphy AJ, Watsford ML, Coutts AJ, Pine MJ. Reliability of a test of musculotendinous stiffness for the triceps-surae. Phys Ther Sport 2003; 4: 175-81.
- Faria A, Gabriel R, Abrantes J, Bras R, Moreira H. Triceps-surae musculotendinous stiffness: Relative differences between obese and non-obese postmenopausal women. Clin Biomech 2009; 24(10): 866-71.
- Blackburn JT, Padua DA, Guskiewicz KM. Muscle stiffness and spinal stretch reflex sensitivity in the triceps surae. J Athl Train 2008; 43(1): 29-36.
- Rees SS, Murphy AJ, Watsford ML, McLachlan KA, Coutts AJ. Effects of proprioceptive neuromuscular facilitation stretching on stiffness and force-producing characteristics of the ankle in active women. J Strength Cond Res 2007; 21(2): 572-7.
- Mademli L, Adamantios A. Mechanical and morphological properties of the triceps surae muscle-tendon unit in old and young adults and their interaction with a submaximal fatiguing contraction. J Electromyogr Kinesiol 2008; 18: 89-98.
- Ullrich AC, Mademli L, Arampatzis A. Effects of submaximal and maximal long-lasting contractions on the compliance of vastus lateralis tendon and aponeurosis in vivo. J Electromyogr Kinesiol 2009; 19(3): 476-83.
- Nordez A, Guevel A, Casari P, Catheline S, Cornu C. Assessment of muscle hardness changes induced by a submaximal fatiguing isometric contraction. J Electromyogr Kinesiol 2009; 19(3): 484-91.
- Magnusson SP, Aagaard P, Larsson B, Kjaer M. Passive energy absorption by human muscleâtendon unit is unaffected by increase in intramuscular temperature. J Appl Physiol 2000;88: 1215â20.
- Houglum PA. Therapeutic exercise for musculoskeletal injuries. Second ed: Human Kinetics, Champaign, IL; 2005.pp. 209.
- Kubo K, Kanehisa H, Kawakami Y, Fukunaga T. Influences of repetitive muscle contractions with different modes on tendon elasticity in vivo. J App Physiol 2001; 91: 277â82.
- Maganaris CN, Baltzopoulos V, Sargeant AJ. Human calf muscle responses during repeated isometric plantarflexions. J Biomech 2006; 39: 1249â55.
- Rigby BJ, Hirai N, Spikes JD, Eyring H. The mechanical properties of rat tail tendon. J Gen Physiol 1959; 43(2): 265-83.