Reliability and Utility of Load-Cell Derived Force–Time Variables Collected During a Constrained and Unconstrained Isometric Knee Extension Task on a Plinth

Abstract

Rate of force development (RFD) and impulse (IMP) are important mechanical measures of muscular performance but are relatively unused within the rehabilitation and performance community. Due principally to access to low-cost testing devices and understanding the utility of these measures. The aim of this study therefore was to quantify the reliability of various force–time variables using load-cell technology collected via isometric knee extension whilst constrained in an isokinetic device (CON90) or unconstrained on a physiotherapy plinth at 60 and 90 degree angles (UNCON60 and UNCON90). Thirty-two volunteers had their peak force (PF), RFD, peak RFD (PRFD), and IMP assessed across three protocols. For all variables, UNCON60 had the largest variability across all measures. PF and PRFD were found to have small variability (ICC > 0.67 and CV < 10%). With regards to RFD 2080 all three protocols were found to have moderate variability all ICCs above 0.75, however, all CVs were greater than 10% ranging from ~ 11%–22%. Finally, IMP 2080 was found to have moderate variability for both CON90 and UNCON90, the absolute consistency once more greater than 10% (~ 11%–25%). Using the constrained and unconstrained protocols, PF and PRFD can be measured reliably between trials with 90 degree knee position.

Keywords

Isometric knee extension / Load cell / Variability / Rate of force development

References

[1] Aagaard P, et al.. Mechanical muscle function, morphology, and fiber type in lifelong trained elderly. Med Sci Sports Exerc, 2007, 39(11): 1989,

[2] Andersen LL, Aagaard P. Influence of maximal muscle strength and intrinsic muscle contractile properties on contractile rate of force development. Eur J Appl Physiol, 2006, 96(1): 46-52,

[3] Angelozzi M, et al.. Rate of force development as an adjunctive outcome measure for return-to-sport decisions after anterior cruciate ligament reconstruction. J Orthop Sports Phys Therap, 2012, 42(9): 772-780,

[4] Beckham G, et al.. Relationships of isometric mid-thigh pull variables to weightlifting performance. J Sports Med Phys Fitness, 2013, 53(5): 573-581

[5] Bradshaw E, et al.. Reliability and variability of day-to-day vault training measures in artistic gymnastics. Sports Biomech, 2010, 9(2): 79-97,

[6] Fukagawa NK, et al.. The relationship of strength to function in the older adult. J Gerontol Ser A: Biol Sci Med Sci, 1995, 50(Special_Issue): 55-59,

[7] Buckthorpe M, Roi GS. The time has come to incorporate a greater focus on rate of force development training in the sports injury rehabilitation process. Muscles Ligaments Tendons J, 2017, 7(3): 435,

[8] Burgess KE, et al.. Plyometric vs. isometric training influences on tendon properties and muscle output. J Strength Condition Res, 2007, 21(3): 986

[9] Clark DJ, et al.. Neuromuscular determinants of maximum walking speed in well-functioning older adults. Exp Gerontol, 2013, 48(3): 358-363,

[10] Cobian DG, et al.. Knee extensor rate of torque development before and after arthroscopic partial meniscectomy, with analysis of neuromuscular mechanisms. J Orthopaed Sports Phys Therap, 2017, 47(12): 945-956,

[11] Crameri R, et al.. Myofibre damage in human skeletal muscle: Effects of electrical stimulation versus voluntary contraction. J Physiol, 2007, 583(1): 365-380,

[12] De Ruiter C, et al.. Initial phase of maximal voluntary and electrically stimulated knee extension torque development at different knee angles. J Appl Physiol, 2004, 97(5): 1693-1701,

[13] De Ruiter CJ, et al.. Fast unilateral isometric knee extension torque development and bilateral jump height. Med Sci Sports Exerc, 2006, 38(10): 1843-1852,

[14] Duchateau J, Baudry S. Maximal discharge rate of motor units determines the maximal rate of force development during ballistic contractions in human. Front Hum Neurosci, 2014, 8: 234,

[15] Dudley-Javoroski S, et al.. Doublet stimulation protocol to minimize musculoskeletal stress during paralyzed quadriceps muscle testing. J Appl Physiol, 2008, 104(6): 1574-1582,

[16] Ellman MB, et al.. Return to play following anterior cruciate ligament reconstruction. JAAOS, 2015, 23(5): 283-296,

[17] Haff GG, et al.. Force-time curve characteristics of dynamic and isometric muscle actions of elite women olympic weightlifters. J Strength Condition Res, 2005, 19(4): 741

[18] Haff GG, et al.. Force-time curve characteristics and hormonal alterations during an eleven-week training period in elite women weightlifters. J Strength Condition Res, 2008, 22(2): 433-446,

[19] Haff GG, et al.. A comparison of methods for determining the rate of force development during isometric midthigh clean pulls. J Strength Condition Res, 2015, 29(2): 386-395,

[20] Hakkinen K, et al.. Neuromuscular adaptations during concurrent strength and endurance training versus strength training. Eur J Appl Physiol, 2003, 89(1): 42-52,

[21] Hernández-Davó JL, Sabido R. Rate of force development: reliability, improvements and influence on performance: a review. Eur J Hum Mov, 2014, 33: 46-69

[22] Ithurburn MP, et al.. Young athletes with quadriceps femoris strength asymmetry at return to sport after anterior cruciate ligament reconstruction demonstrate asymmetric single-leg drop-landing mechanics. Am J Sports Med, 2015, 43(11): 2727-2737,

[23] Jenkins N, et al.. The rate of torque development: a unique, non-invasive indicator of eccentric-induced muscle damage?. Int J Sports Med, 2014, 35(14): 1190-1195,

[24] Klass M, Baudry S, Duchateau J. Age-related decline in rate of torque development is accompanied by lower maximal motor unit discharge frequency during fast contractions. J Appl Physiol, 2008, 104(3): 739-746,

[25] Kubo K, et al.. Effects of isometric training on the elasticity of human tendon structures in vivo. J Appl Physiol, 2001, 91(1): 26-32,

[26] Kyritsis P, et al.. Likelihood of ACL graft rupture: not meeting six clinical discharge criteria before return to sport is associated with a four times greater risk of rupture. Br J Sports Med, 2016, 50(15): 946,

[27] Lenetsky S, et al.. Variability and reliability of punching impact kinetics in untrained participants and experienced boxers. J Strength Condition Res, 2018, 32(7): 1838-1842,

[28] Maffiuletti NA. Assessment of hip and knee muscle function in orthopaedic practice and research. JBJS, 2010, 92(1): 220-229,

[29] Maffiuletti NA, et al.. Rate of force development: physiological and methodological considerations. Eur J Appl Physiol, 2016, 116(6): 1091-1116,

[30] Manske R, Reiman M. Functional performance testing for power and return to sports. Sports Health, 2013, 5(3): 244-250,

[31] Morris RC, et al.. Return to play following anterior cruciate ligament reconstruction. Clin Sports Med, 2016, 35(4): 655-668,

[32] Noorkõiv M,Nosaka K, Blazevich AJ. Neuromuscular adaptations associated with knee joint angle-specific force change. Med Sci Sports Exerc. 2014;46(8):1525–37.

[33] Oranchuk DJ, et al.. Variability of regional quadriceps architecture in trained men assessed by B-mode and extended-field-of-view ultrasonography. Int J Sports Physiol Perform, 2020, 15(3): 430-436,

[34] Oranchuk DJ, et al.. Variability of concentric angle-specific isokinetic torque and impulse assessments of the knee extensors. Physiol Measur, 2020, 41(1): 01-02,

[35] Oranchuk DJ, Storey AG, Nelson AR, Neville JG, Cronin JB. Variability of multiangle isometric force-time characteristics in trained men. J Strength Condition Res. 2022;36(1):284–288.

[36] Peñailillo L, et al.. Rate of force development as a measure of muscle damage. Scand J Med Sci Sports, 2015, 25(3): 417-427,

[37] Rodríguez-Rosell D, et al.. Physiological and methodological aspects of rate of force development assessment in human skeletal muscle. Clin Physiol Funct Imaging, 2018, 38(5): 743-762,

[38] Schmitt LC, Paterno MV, Hewett TE. The impact of quadriceps femoris strength asymmetry on functional performance at return to sport following anterior cruciate ligament reconstruction. J Orthop Sports Phys Therap, 2012, 42(9): 750-759,

[39] Schmitt LC, et al.. Strength asymmetry and landing mechanics at return to sport after ACL reconstruction. Med Sci Sports Exerc, 2015, 47(7): 1426,

[40] Slawinski J, et al.. Kinematic and kinetic comparisons of elite and well-trained sprinters during sprint start. J Strength Condition Res, 2010, 24(4): 896-905,

[41] Stone MH, et al.. The importance of isometric maximum strength and peak rate-of-force development in sprint cycling. J Strength Condition Res, 2004, 18(4): 878-884

[42] Thompson BJ, et al.. Can maximal and rapid isometric torque characteristics predict playing level in division I American collegiate football players?. J Strength Condition Res, 2013, 27(3): 655-661,

[43] Thompson BJ, et al.. Age-related changes in the rate of muscle activation and rapid force characteristics. Age, 2014, 36(2): 839-849,

[44] Tillin NA, Pain MTG, Folland J. Explosive force production during isometric squats correlates with athletic performance in rugby union players. J Sports Sci, 2013, 31(1): 66-76,

[45] Undheim MB, et al.. Isokinetic muscle strength and readiness to return to sport following anterior cruciate ligament reconstruction: is there an association? A systematic review and a protocol recommendation. Br J Sports Med, 2015, 49(20): 1305,

[46] Van Cutsem M, Duchateau J, Hainaut K. Changes in single motor unit behaviour contribute to the increase in contraction speed after dynamic training in humans. J Physiol, 1998, 513(1): 295-305,

[47] van Melick N, et al.. Evidence-based clinical practice update: practice guidelines for anterior cruciate ligament rehabilitation based on a systematic review and multidisciplinary consensus. Br J Sports Med, 2016, 50(24): 1506-1515,

[48] Ventura A, et al.. Deficits in rate of torque development are accompanied by activation failure in patients with knee osteoarthritis. J Electromyogr Kinesiol, 2019, 44: 94-100,

[49] Vila-Chã C, et al.. Changes in H reflex and V wave following short-term endurance and strength training. J Appl Physiol, 2012, 112(1): 54-63,