Metabolic response of endurance athletes to training with added load

  • Heikki Rusko
  • Carmelo Bosco


Endurance athletes were divided into experimental (n=12) and control (n=12) groups to investigate the effects of extra-load training on energy metabolism during exercise. A vest weighing 9%–10% body weight was worn every day from morning to evening for 4 weeks including every (n=6) or every other (n=6) training session. After 4 weeks the control group had a lower blood lactate concentration during submaximal running, whereas the experimental group had significantly higher blood lactate and oxygen uptake (p<0.01–p<0.05), and a lower 2 mmol lactate threshold (p<0.05) and an increased blood lactate concentration after a short running test to exhaustion (p<0.05). Those experimental subjects (n=6) who used the added load during every training session had a lower 2 mmol lactate threshold, improved running time to exhaustion, improved vertical velocity when running up stairs and an increased \(\dot V_{O_2 }\) during submaximal running after the added load period. It is concluded that the additional loading increased anaerobic metabolism in the leg muscles during submaximal and maximal exercise. An increased recruitment and adaptation of the fast twitch muscle fibres is suggested as the principal explanation for the observed changes.

Key words

Training extra-load Athletes Blood lactate Running economy 


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  1. Aunola S, Rusko H (1984) Reproducibility of aerobic and anaerobic thresholds in 20–50 year old men. Eur J Appl Physiol 53:260–266Google Scholar
  2. Bosco C, Montanari G, Ribacchi R, Faina M, Colle R, Dal Monte A, Latteri F, Pastoralis O, Benzi G, Cortili G, Saibene F (1986a) The relationship between the re-use of elastic energy and the energetic cost of running. In: Benzi G, Packer L, Siliprandi N (eds) Biochemical aspects of physical exercise. Elsevier Science Publishers BV, pp 469–478Google Scholar
  3. Bosco C, Rusko H, Hirvonen J (1986b) The effect of extraload conditioning on muscle performance in athletes. Med Sci Sports Exerc 18:415–419Google Scholar
  4. Bosco C, Zanon S, Rusko H, DalMonte A, Bellotti P, Latteri F, Candeloro N, Locatelli E, Azzarro E, Pozzo R, Bonomi S (1984) The influence of extra load on the mechanical behavior of skeletal muscle. Eur J Appl Physiol 53:149–154Google Scholar
  5. Costill DL, Bowers R, Branam G, Sparks K (1971) Muscle glycogen utilization during prolonged exercise on successive days. J Appl Physiol 31:834–838Google Scholar
  6. Costill DL, Fink WJ, Pollock ML (1976) Muscle fiber composition and enzyme activities of elite distance runners. Med Sci Sports 8:96–100Google Scholar
  7. Cureton KJ, Sparling PB (1980) Distance running performance and metabolic responses to running in men and women with excess weight experimentally equated. Med Sci Sports Exerc 12:288–294Google Scholar
  8. Daniels JT (1985) A physiologist's view of running economy. Med Sci Sports Exerc 17:332–338Google Scholar
  9. Daniels JT, Yarbrough RA, Foster C (1978) Changes in \(V_{O_{2{\text{max}}} }\) and running performance with training. Eur J Appl Physiol 39:249–254Google Scholar
  10. Essen-Gustafsson B, Henriksson J (1984) Enzyme levels in pools of microdissected human muscle fibres of identified type. Adaptive response to exercise. Acta Physiol Scand 120:505–515Google Scholar
  11. Evans OM, Zerbib Y, Faria MH, Monod H (1983) Physiological responses to load holding and load carriage. Ergonomics 26:161–171Google Scholar
  12. Gollnick PD, Parsons D, Riedy M, Moore RL (1983) Fiber number and size in overloaded chicken anterior latissimus dorsi muscle. J Appl Physiol Respirat Environ Exercise Physiol 54:1292–1297Google Scholar
  13. Gordon MJ, Coslin BR, Graham T, Hoare J (1983) Comparison between load carriage and grade walking on a treadmill. Ergonomics 26:289–298Google Scholar
  14. Henriksson J, Reitman J (1976) Quantitative measures of enzyme activities in type I and type II muscle fibers of man after training. Acta Physiol Scand 97:392–397Google Scholar
  15. Jansson E, Kaijser L (1977) Muscle adaptation to extreme endurance training in man. Acta Physiol Scand 100:315–324Google Scholar
  16. Kaneko M, Ito A, Fuchimoto T, Shishikura Y, Toyooka J (1985) Influence of running speed on the mechanical efficiency of sprinters and distance runners. In: Winter DA, Norman RW, Wells RP, Hayes KC, Patla AE (ed) Biomechanics IX B. Il Human Kinetics Publishers, Champaign, pp 307–312Google Scholar
  17. Keren G, Epstein Y, Magazanik A, Sohar E (1981) The energy cost of walking and running with and without a backpack load. Eur J Appl Physiol 46:317–324Google Scholar
  18. Keul J, Simon G, Berg A, Dickhuth HH, Goerttler I, Kübel R (1979) Bestimmung der individuellen anaeroben Schwelle zur Leistungsbewertung und Trainingsgestaltung. Dtsch Z Sportmed 30:212–218Google Scholar
  19. Margaria R, Aghemo P, Rovelli E (1966) Measurement of muscular power (anaerobic) in man. J Appl Physiol 21:1661–1664Google Scholar
  20. Martin WD, Romond EH (1975) Effects of chronic rotation and hypergravity on muscle fibers of soleus and plantaris muscles of the rat. Exp Neurol 49:758–771Google Scholar
  21. Pandolf KB, Goldman RF (1975) Physical conditioning of less fit adults by use of leg weight loading. Arch Phys Med Rehabil 56:255–261Google Scholar
  22. Pollock ML (1977) Submaximal and maximal working capacity of elite distance runners. Part I: Cardiorespiratory aspects. Ann NY Acad Sci 301:310–322Google Scholar
  23. Raab DM, Smith RT, Smith EL, Gilligan C (1985) Energy cost of wearing weighted bands while walking and jogging. Med Sci Sports Exerc 17:268Google Scholar
  24. Robertson RJ, Caspersen CJ, Allison TG, Skrinar GS, Abbott RA, Metz KF (1982) Differentiated perceptions of exertion and energy cost of young women while carrying loads. Eur J Appl Physiol 49:69–78Google Scholar
  25. Rusko H, Rahkila P (1981) Training and muscle fiber composition in female endurance athletes. Poster presentation in International Conference on Sports Medicine 23.–26. March, Utrecht, The NetherlandsGoogle Scholar
  26. Rusko H, Rahkila P, Karvinen E (1980) Anaerobic threshold, skeletal muscle enzymes and fiber composition in young female cross-country skiers. Acta Physiol Scand 108:263–268Google Scholar
  27. Saltin B (1981) Muscle fibre recruitment and metabolism in prolonged exhaustive dynamic exercise. In: Human muscle fatigue: physiological mechanisms. Ciba Foundation Symposium 82, Pitman Medical, London, pp 41–58Google Scholar
  28. Schantz P, Billeter R, Henriksson J, Jansson E (1982) Training-induced increase in myofibrillar ATP-ase intermediate fibers in human skeletal muscle. Muscle Nerve 5:628–636Google Scholar
  29. Schnabel A, Kinderman W (1983) Assessment of anaerobic capacity in runners. Eur J Appl Physiol 52:24–26Google Scholar
  30. Skinner JS, McLellan TM (1980) The transition from aerobic to anaerobic metabolism. Res Quart Exerc Sport 51:234–248Google Scholar
  31. Soule RG, Goldman RF (1969) Energy cost of loads carried on the head, hands, or feet J Appl Physiol 27:687–690Google Scholar
  32. Stegmann H, Kindermann W (1981) Bestimmung der individuellen anaeroben Schwelle bei unterschiedlich Ausdauertrainierten aufgrund des Verhaltens der Lactatkinetik während der Arbeits- und Erholungsphase. Dtsch Z Sportmed 32:213–221Google Scholar
  33. Taylor CR, Heglund NC, McMahon TA, Looney TR (1980) Energetic cost of generating muscular force during running. J Exp Biol 86:9–18Google Scholar
  34. Thornton WE, Rummel JA (1974) Muscular deconditioning and its prevention in space flight. Proc Skylab Life Sci Symp I:407–414. NASA, HoustonGoogle Scholar
  35. Udassin R, Shoenfeld Y, Shapiro Y, Birenfeld C, Sohar E (1977) Serum glucose and lactic acid concentrations during prolonged and strenouns exercise in man. Am J Physiol Med 56:249–256Google Scholar
  36. Wasserman K, Whipp BJ, Koyal SN, Beaver WL (1973) Anaerobic threshold and respiratory gas exchange during exercise. J Appl Physiol 35:236–243Google Scholar
  37. Zika K, Lojda Z, Kucera M (1973) Activities of some oxidative and hydrolytic enzymes in musculus biceps brachii of rats after tonic stress. Histochemistry 35:153–164Google Scholar

Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • Heikki Rusko
    • 1
  • Carmelo Bosco
    • 2
  1. 1.Department of Biology of Physical ActivityUniversity of JyväskyläJyväskyläFinland
  2. 2.Kuortane Sport InstituteKuortaneFinland

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