Int J Sports Med 2000; 21(6): 429-436
DOI: 10.1055/s-2000-3832
Training and Testing
Georg Thieme Verlag Stuttgart · New York

Evolution of Electromyographic Signal, Running Economy, and Perceived Exertion During Different Prolonged Exercises

C. Hausswirth1 ,  J. Brisswalter2 ,  J. M. Vallier3 ,  D. Smith4 ,  R. Lepers5
  • 1 Laboratoire de Biomécanique et de Physiologie, Institut National du Sport et de l'Education Physique, Paris, France
  • 2 Université de Toulon-Var, Unité Ergonomie Sportive et Performance, La Garde cedex, France
  • 3 Département médical, Institut National du Sport et de l'Education Physique, Paris, France
  • 4 Consultant Sport Scientist, Gold Coast, Queensland, Australia
  • 5 Université de Bourgogne, Groupe d'Analyse du Mouvement, UFR-STAPS, Campus universitaire, Dijon cedex, France
Further Information

Publication History

Publication Date:
31 December 2000 (online)

The purpose of this study was to compare the electromyographic (EMG) signal of the vastus lateralis muscle obtained during a run section of a triathlon and at the end of a prolonged run performed at the same running velocity. Seven subjects were studied on three occasions: a 2 h 15 min triathlon (30 min swimming, 60 min cycling, and 45 min treadmill running at 75 % of the maximal aerobic speed), a 2 h 15 min run, where the last 45 min (Prolonged Run, PR) were run at the same speed as the Triathlon Run (TR) on a motorized treadmill, and a 45 min Isolated Run (IR) performed at the same TR and PR velocity. The three experimental trials were randomised. Oxygen uptake (V˙O2), heart rate (HR), and EMG data were recorded during the three run sections. The results confirm a greater V˙O2 and HR during PR compared with IR (P < 0.01) and TR (P < 0.05). Also the V˙O2 values obtained during TR were significantly greater compared to IR (P < 0.05). EMG signal, obtained from the vastus lateralis muscle during 4 sec of isometric contraction at 35 % of maximal voluntary contraction (MVC), showed that after PR the mean power frequency (MPF) shifted significantly to lower frequencies (P < 0.01) compared with MPF recorded before the prolonged run. Moreover, the signal amplitude (RMS) was increased significantly after PR in comparison to pre-trial (P < 0.01). Similar results were obtained for the TR at P < 0.05. The integrated EMG flow, Q˙IEMG (iEMG/burst duration), recorded during all run sections, was significantly increased near the end of PR (i.e. 2 h 10 min of running) compared with Q˙iEMG recorded after 1 h 30 min of running. No significant increase in Q˙iEMG was observed with TR and IR situations. The results suggest that a long exercise bout of running led to a greater increase in muscle fatigue compared with a triathlon or an isolated run performed at the same running speed. In addition it is suggested that the rating of perceived exertion recorded during isometric contractions is a good indice to approach the level of fatigue during prolonged exercises.

References

  • 1 Arendt-Nielsen L, Mills R K. Muscle fibre conduction velocity, mean power frequency, mean EMG voltage and force during submaximal fatiguing contractions of human quadriceps.  Eur J Appl Physiol. 1988;  58 20-25
  • 2 Astrand P O, Rhyming I. A nomogram for calculation of aerobic capacity (physical fitness) from pulse rate during submaximal work.  J Appl Physiol. 1954;  7 218-222
  • 3 Bigland-Ritchie B, Woods J J. Changes in muscle contractile properties and neural control during human muscular fatigue.  Muscle Nerve. 1984;  7 691-699
  • 4 Boone T, Kreider R B. Bicycle exercise before running: effect on performance.  Ann Sports Med. 1986;  3 25-29
  • 5 Borg G AV. Perceived exertion as an indicator of somatic stress.  Scand J Rehab Med. 1970;  2 92-98
  • 6 Brueckner J C, Atchou G, Capelli C, Duvallet A, Barrault D, Joussellin E, Rieu M, di Prampero P E. The energy cost of running increases with the distance covered.  Eur J Appl Physiol. 1991;  62 385-389
  • 7 Davies C TM, Thompson M W. Physiological responses to prolonged exercise in ultramarathon athletes.  J Appl Physiol. 1986;  61 611-617
  • 8 De Luca C J. Myoelectrical manifestations of localized muscular fatigue in humans.  Crit Rev Biomed Eng. 1984;  11 251-279
  • 9 Di Prampero P E. The energy cost of human locomotion on land and in water.  Int J Sports Med. 1986;  7 55-72
  • 10 Fridén J, Sjöström M, Ekblom B. A morphological study of delayed muscle soreness.  Experientia. 1981;  37 506-507
  • 11 Gamet D, Maton B. The fatigability of two muscles in human isometric voluntary submaximal contraction: an EMG study. Assessment of muscular fatigue by means of surface EMG.  Eur J Appl Physiol. 1989;  58 361-368
  • 12 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 13: 877-881
  • 13 Guézennec C Y, Giaoui M, Voignier J P, Legrand H, Fournier E. Evolution des taux plasmatiques des LDH (lacticodeshydrogénase), CPK (créatine phosphokinase) et de la myoglobine à l'issue d'une course de 100 km et d'un triathlon.  Science & Sports. 1986;  1 255-263
  • 14 Guézennec C Y, Vallier J M, Bigard A X, Durey A. Increase in energy cost of running at the end of a triathlon.  Eur J Appl Physiol. 1996;  73 440-445
  • 15 Hausswirth C, Bigard A X, Berthelot M, Guézennec C Y. Variability in energy cost of running at the end of a triathlon and a marathon.  Int J Sports Med. 1996;  17 574-581
  • 16 Hausswirth C, Bigard A X, Guézennec C Y. Relationships between energy cost of running and running mechanics occurring at the end of a triathlon and a marathon.  Int J Sports Med. 1997;  18 330-339
  • 17 Heise G D, Morgan D W, Hough H, Craib M. Relationships between running economy and temporal EMG characteristics of bi-articular leg muscles.  Int J Sports Med. 1996;  17 128-133
  • 18 Kadefors R, Kaiser E, Petersen I. Dynamic spectrum analysis of myo-potentials with special reference to muscle fatigue.  Electromyography. 1968;  8 8-39
  • 19 Komi P V, Viitasalo J T. 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
  • 20 Komi P V, Tesch P. EMG frequency spectrum, muscle structure and fatigue during contractions in man.  Eur J Appl Physiol. 1979;  42 41-50
  • 21 Kreider R B, Cundiff D E, Hammet J B, Cortes C W, William K W. Effects of cycling on running performance in triathletes.  Annals Sports Med. 1988;  4 220-225
  • 22 Kwatny E, Thomas D H, Kwatny H G. An application of signal processing techniques to the study of myoelectric signals.  IEEE Trans Biomed Eng. 1970;  17 303-312
  • 23 Lepers R, Hausswirth C. Altérations des performances neuro-musculaires après un exercice physique prolongé: analyse comparée du triathlon et du marathon.  Science & Motricité. 1988;  34 37-43
  • 24 Magazanik A, Shapiro T, Meytes D, Meytes I. Enzyme blood levels and water balance during a marathon race.  J Appl Physiol. 1974;  36 214-217
  • 25 Medbø J I, Mohn A C, Tabata I, Bahr R, Vaage O, Sejersted O M. Anaerobic capacity determined by maximal accumulated O2 deficit.  J Appl Physiol. 1988;  64 50-60
  • 26 Mills K S. Power spectral analysis of electromyogram and compound muscle action potential during muscle fatigue and recovery.  J Physiol. 1982;  36 362-401
  • 27 Montain S J, Coyle E F. Influence of graded dehydration on hyperthermia and cardiovascular drift during exercise.  J Appl Physiol. 1992;  73 1340-1350
  • 28 Moritani T, Oddson L, Thorstensson A. Electromyographic evidence of selective fatigue during the eccentric phase of stretch-shortening cycle in man.  Eur J Appl Physiol. 1990;  60 425-429
  • 29 Nicol C, Komi P V, Marconnet P. Fatigue effects of marathon running on neuromuscular performance: changes in force, integrated electromyographic activity and endurance capacity.  Scand J Med Sci Sports. 1991;  1 18-24
  • 30 O'Toole M L, Hiller W DB, Crosby L O, Douglas P S. The ultraendurance triathlete: a physiological profile.  Med Sci Sports Exerc. 1987;  19 45-50
  • 31 Setruk D, Fery Y, Ferry A, Rieu M. Perception subjective de la fatigue musculaire: utilisation de l'échelle de Borg.  Science & Sports. 1995;  10 209-210
  • 32 Sproule J. Running economy deteriorates following 60 min of exercise at 80 % V˙O2max.  Eur J Appl Physiol. 1998;  77 366-371
  • 33 Viitasalo J T, Komi P V, Jacobs I, Karlsson J. Effects of prolonged cross-country skiing on neuromuscular performance. In: Komi PV (ed) Exercise and Sport Biology International Series on Sport Sciences. Champaign, IL; Human Kinetic Publishers 1982 12: 191-198
  • 34 Wahrol M J, Siegel A J, Evans W J, Silverman L M. Skeletal muscle injury and repair in marathon runners after competition.  Am J Pathol. 1985;  118 331-339
  • 35 Williams K R. Biomechanics in distance running. In: Grabiner MD (ed) Current Issues in Biomechanics. Champaign, IL; Human Kinetic Publishers 1993: 17
  • 36 Xu F, Montgomery D L. Effect of prolonged exercise at 65 and 80 % V˙O2max on running economy.  Int J Sports Med. 1995;  16 309-315

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