The Effects of a Prolonged Running Exercise on Strength Characteristics

The aim of this study was to examine concentric, isometric, and eccentric strength reductions in the quadriceps muscle following a prolonged running exercise. Before and after a 2 h run (28.4 ± 1.4 km) peak torque (PT) of the knee extensors at angular velocities of - 120, - 90, - 60, 0, 60, 120, 180, 240° · s^-1 using an isokinetic dynamometer, electromyographic (EMG) activity of the vastus lateralis (VL) and vastus medialis (VM) muscles and height of a counter movement jump were recorded in twelve well-trained triathletes. Counter movement jump performances decreased by 10 % and PT values were all significantly lower (p < 0.01) at each angular velocity following the run. The torque loss was significantly (p < 0.01) greater under eccentric contractions (from 18 to 21 %) than under concentric ones (from 11 to 14 %). EMG activity (RMS) was lower in both VL and VM muscles after the 2 h run but no difference existed in RMS losses between concentric and eccentric contractions. The present results demonstrate that 1) a prolonged running exercise more greatly affects eccentric force production in the quadriceps muscle, and 2) this specificity seems to be due to an impairment of the muscular contractile mechanism rather than a modification to the neural input.

Peak torque/angular velocity relationship, RMS/angular velocity relationship, EMG, eccentric contraction, fatigue.

References

• 01 Abernethy P J. Influence of acute endurance activity on isokinetic strength.  J Strength Cond Res. 1993;  7 141-146
• 02 Asmusen E, Bonde-Petersen F. Storage of elastic energy in skeletal muscles in man.  Acta Physiol Scand. 1974;  91 385-392
• 03 Davies C TM, White M J. Muscle weakness following eccentric work in man.  Pflügers Arch. 1981;  392 168-171
• 04 Davies C TM, Thompson M W. Physiological responses to prolonged exercise in ultramarathon athletes.  J Appl Physiol. 1986;  61 611-617
• 05 De Luca C J. The use of surface electromyography in biomechanics.  J Appl Biomech. 1997;  13 135-163
• 06 Eston R G, Finney S, Baker S, Baltzopoulos V. Muscle tenderness and peak torque changes after downhill running following a prior bout of isokinetic eccentric exercise.  J Sports Sci. 1996;  14 291-299
• 07 Forsberg A, Tesch P, Karlsson J. Effect of prolonged exercise on muscle strength performance. In: Asmussen E, Jorgensen K (eds) Biomechanics VI[A]. Baltimore; University Park Press 1979: 62-67
• 08 Friden J, Sjöstrom M, Ekblom B. Myofibrillar damage following intense eccentric exercise in man.  Int J Sports Med. 1983;  4 170-176
• 09 Glace B W, McHugh M P, Gleim G W. Effects of a 2-hour run on metabolic economy and lower extremity strength in men and women.  JOSPT. 1998;  27 189-196
• 10 Gunderson H M, Parliman J A, Parker J A, Bell G. Membrane permeability changes as a fatigue factor in marathon runners. In: Knuttgen HG et al. (eds) The biochemistry of exercise. Champaign IL; Human Kinetics Publishers 1983: 877-881
• 11 Hausswirth C, Bigard A X, Guezennec C Y. Relationships between running mechanics and energy cost of running at the end of a triathlon and a marathon.  Int J Sport Med. 1997;  18 1-10
• 12 Ingalls C P, Warren G L, Williams J H, Ward C W, Armstrong R B. E-C coupling failure in mouse EDL muscle after in vivo eccentric contractions.  J Appl Physiol. 1998;  85 58-67
• 13 Kellis E, Baltzopoulos V. The effects of antagonist moment on resultant knee joint moment during isokinetic testing of the knee extensors.  Eur J Appl Physiol. 1997;  76 253-259
• 14 Komi P V, Viitasalo J TJ. Changes in motor unit activity and metabolism in human skeletal muscle during and after repeated eccentric and concentric contractions.  Acta Physiol Scand. 1977;  100 246-254
• 15 Léger L, Boucher R. An indirect continuous running multistage field test, the Université de Montréal test.  Can J Sports Sci. 1980;  5 77-84
• 16 Magazanik A, Shapiro Y, Meytes D, Meytes Y. Enzyme blood levels and water balance during a marathon race.  J Appl Physiol. 1974;  36 214-217
• 17 Nardone A, Romano C, Schieppati M. Selective recruitment of high-threshold human motor units during voluntary isotonic lengthening of active muscles.  J Physiol. 1989;  409 451-471
• 18 Nicol C, Komi P V, Marconnet P. Fatigue effects of marathon running on neuromuscular performance. I Changes in muscle force and stiffness characteristics.  Scand J Med Sci Sports. 1991;  1 10-17
• 19 Nicol C, Komi P V, Marconnet P. Fatigue effects of marathon running on neuromuscular performance. II Changes in force, integrated electromyographic activity and endurance capacity.  Scand J Med Sci Sports. 1991;  1 18-24
• 20 Sahlin K, Seger J Y. Effects of prolonged exercise on the contractile properties of human quadriceps muscle.  Eur J Appl Physiol. 1995;  71 180-186
• 21 Sherman W M, Armstrong L E, Murray T M, Hagerman F C, Costill D L, Staron R C, Ivy J L. Effect of a 42.2-km footrace and subsequent rest or exercise on muscular strength and work capacity.  J Appl Physiol. 1984;  57 1668-1673
• 22 Viitasalo J T, Komi P V, Jacobs I, Karlsson J. Effects of prolonged cross-country skiing on neuromuscular performance. In: Komi PV (eds) Exercise and sport biology. International series on sport sciences, vol 12. Champaign, IL; Human Kinetics Publishers 1982: 191-198
• 23 Weir J P, Keefe D A, Eaton J F, Augustin R T, Tobin D M. Effect of fatigue on hamstring coactivation during isokinetic knee extensions.  Eur J Appl Physiol. 1998;  78 555-559
• 24 Winter D A. Moments of force and mechanical power in jogging.  J Biomechanics. 1983;  16 91-97