Abstract
This study tested the hypothesis that eccentric exercise (ECC) would increase force fluctuation for several days following exercise; however, concentric exercise (CON) would not produce such an effect. Twelve men performed six sets of five reps of dumbbell exercise of the elbow flexors eccentrically with one arm and concentrically with the other, separated by 4–6 weeks, using a dumbbell set at 50% of maximal voluntary isometric contraction (MVC) measured at 90° of elbow flexion. MVC, range of motion (ROM), upper arm circumference, plasma creatine kinase activity (CK), myoglobin concentration (Mb) and muscle soreness were assessed before, immediately after, 1 h and 1–5 days following both exercise bouts. Force fluctuations during 30, 50 and 80% MVC were quantified by coefficient of variation (CV) of the force data (sampling frequency: 100 Hz) for 4 s. Significantly (P<0.01) larger changes in MVC, ROM, and upper arm circumference were evident following ECC compared to CON, and only ECC resulted in significant (P<0.01) increases in CK and Mb, and development of muscle soreness. Significant (P<0.01) differences existed between ECC and CON for changes in force fluctuations. CV increased significantly (P<0.01) immediately and 1 h after ECC from baseline for 30, 50, and 80% MVC without a significant difference among the intensities, and no significant changes in CV were evident following CON. It was concluded that increases in force fluctuation were peculiar to ECC, but did not necessarily reflect muscle damage.
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Bazzucchi I, Felici F, Macaluso A, De Vito G (2004) Difference between young and older women in maximal force, and surface EMG during isometric knee extension and elbow flexion. Muscle Nerve 30:626–635
Christou EA, Carlton LG (2002) Motor output is more variable during eccentric compared with concentric contractions. Med Sci Sports Exerc 34:1773–1778
Clarkson PM, Byrnes WC, McCormick KM, Turcotte LP, White JS (1986) Muscle soreness and serum creatine kinase activity following isometric, eccentric, and concentric exercise. Int J Sports Med 7:152–155
Clarkson PM, Nosaka K, Braun B (1992) Muscle function after exercise-induced muscle damage and rapid adaptation. Med Sci Sports Exerc 24:512–520
Enoka RM, Christou EA, Hunter SK, Kornatz KW, Semmler JG, Taylor AM, Tracy BL (2003) Mechanisms that contribute to differences in motor performance between young and old adults. J Electromyogr Kinesiol 13:1–12
Gibala MJ, MacDougall JD, Stauber WT, Elorriaga A (1995) Changes in human skeletal muscle ultrastructure and force production after acute resistance exercise. J Appl Physiol 78:702–708
Graves AE, Kornatz KW, Enoka RM (2000) Older adults use a unique strategy to lift inertial loads with the elbow flexor muscles. J Neurophysiol 83:2030–2039
Hamlin MJ, Quigley BM (2001) Quadriceps concentric and eccentric exercise 1: Changes in contractile and electrical activity following eccentric and concentric exercise. J Sci Med Sports 4:88–10
Hunter SK, Enoka RM (2003) Changes in muscle activation can prolong the endurance time of a submaximal isometric contraction in humans. J Appl Physiol 94:108–118
Hunter SK, Ryan DL, Ortega JD, Enoka RM (2002) Task differences with same load torque alter the endurance time of submaximal fatiguing contractions in humans. J Neurophysiol 88:3087–3096
Kossev A, Christova P (1998) Discharge pattern of human motor units during dynamic concentric and eccentric contractions. Electroencephalogr Clin Neurophysiol 109:245–255
Nosaka K, Newton M (2002) Concentric or eccentric training effect on eccentric exercise-induced muscle damage. Med Sci Sports Exerc 34:63–69
Nosaka K, Newton M, Sacco P, Chapman D, Lavender A (2005) Partial protection against muscle damage by eccentric actions at short muscle lengths. Med Sci Sports Exerc 37:746–753
Saxton JM, Clarkson PM, James R, Miles M, Westerfer M, Clark S, Donnelly AE (1995) Neuromuscular dysfunction following eccentric exercise. Med Sci Sport Exerc 27:1185–1193
Shellock FG, Fukunaga T, Mink JH, Edgerton VR (1991) Acute effects of exercise on MR imaging of skeletal muscle: concentric vs eccentric actions. Radiology 179:659–664
Talag TS (1973) Residual muscular soreness as influenced by concentric, eccentric, and static contractions. Res Q 44:458–469
Taylor AM, Christou EA, Enoka RM (2003) Multiple features of motor unit activity influence force fluctuations during isometric contractions. J Neurophysiol 90:1350–1361
Tracy BL, Enoka RM (2002) Older adults are less steady during submaximal isometric contractions with the knee extensor muscles. J Appl Physiol 92:1004–1012
Warren GL, Ingalls CP, Lowe DA, Armstrong DA (2001) Excitation-contraction uncoupling: major role in contraction-induced muscle injury. Exerc Sport Sci Rev 29:82–87
Yao W, Fuglevand AJ, Enoka RM (2000) Motor-unit synchronization increases EMG amplitude and decreases force steadiness of simulated contractions. J Neurophysiol 83:441–452
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Lavender, A.P., Nosaka, K. Changes in fluctuation of isometric force following eccentric and concentric exercise of the elbow flexors. Eur J Appl Physiol 96, 235–240 (2006). https://doi.org/10.1007/s00421-005-0069-5
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DOI: https://doi.org/10.1007/s00421-005-0069-5