Abstract
The present study was designed to study intra-individual step variability measured both on vertical displacement of the body (ΔZ) and on step time (Δt) parameters by means of a kinematic arm and during treadmill running. A group of 17 subjects ran successively at 60%, 80%, 100% and 140% of their maximal aerobic velocity (v amax). The total number of steps analysed was 6116. The absolute ΔZ step variability (σΔZ) ranged between 5 mm and 21 mm while the absolute Δt variability (σΔt) ranged between 6 ms and 40 ms. Step variabilities were due to step asymmetry (from 38.5% to 48.5% of the step variability) and to stride variability. For submaximal velocities (60%, 80%, and 100%v amax) both σΔt and σΔZ were independent of velocity or body dimensions whereas differences between subjects were significant (P < 0.01) for σΔZ. On the other hand, variabilities were significantly increased when velocity was changed from submaximal to the 140%v amax level. Furthermore, at submaximal levels σΔZ was linked to the subject's energy cost of running (P < 0.05). Therefore, the intra-individual step variability should not be neglected in future studies on mechanical efficiency of running and it is suggested that, to obtain a good accuracy (better than 1%,P < 0.05) on mean value and variability of the mechanical parameters, measurements should be performed on at least 32–64 consecutive steps, which corresponds to about 15 to 20 s of running.
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⫗Astrand P-O, Rodhal K. (1986) Textbook of work physiology, 3rd edn. McGraw-Hill, New York, pp 543–556
Bates BT, Osternig LR, Mason BR, James SL (1979) Functional variability of lower extremity during the support phase of running. Med Sci Sports Exerc 11:328–331
Bates BT, Osternig LR, Sawhill JA, James SL (1983) Assessment of subject variability, subject-shoe interaction, and the evaluation of running shoes using ground reaction force data. J. Biomech 16:181–191
Belli A, Bosco C (1992) Influence of stretch-shortening cycle on mechanical behaviour of triceps surae during hopping. Acta Physiol Scand 144:401–408
Belli A, Rey S, Bonnefoy R, Lacour JR (1992) A simple device for kinematic measurements of human movements. Ergonomics 27:285–287
Belli A, Avela J, Komi PV (1993) Mechanical energy assessment with different methods during running. Int J Sports Med 14:252–256
Bourdin M, Pastene J, Germain M, Lacour J-R, (1993) Influence of training, sex, age and body mass on the energy cost of running. Eur J Appl Physiol 66:439–444
Cavagna GA (1975) Force platforms as ergometers. J Appl Physiol 39:174–179
Cavanagh PR (1990) Biomechanics: a bridge builder among the sport sciences. Med Sci Sports Exerc 22:546–557
Cavanagh PR, Kram R (1989) Stride length in distance running: velocity, body dimensions, and added mass effects. Med Sci Sports Exerc 21:467–479
Cavanagh PR, Pollock ML, Landa J (1977) A biomechanical comparison of elite and good distance runners. The marathon: physiological, epidemiological, and psychological studies. Ann NY Acad Sci 301:328–345
Cavanagh PR, Andrew GC, Kram R, Rodgers MM, Sanderson DJ, Henning EM (1985) An approach to biomechanical profiling of elite distance runners. Int J Sports Biomech 1:36–62
di Prampero PE (1986) The energy cost of human locomotion on land and in water. Int J Sports Med 7:55–72
Fenn WO (1993) Work against gravity and work due to velocity changes in running. Am J Physiol 93:433–462
Ingen Schenau GJ van (1980) Some fundamental aspects of the biomechanics of overground versus treadmill locomotion. Med Sci Sports Exerc 12:257–261
Lacour J-R, Padilla-Magunacelaya S, Barthelemy J-C, Dormois D (1990) The energetics of middle distance running. Eur J Appl Physiol 60:38–43
Luhtanen P, Komi PV (1978) Mechanical factors influencing running speed. In: Asmussen E, Jorgensn K (eds) Biomechanics VI-B. University Park Press, Baltimore; pp 23–29
Morgan DW, Martin PE, Krahenbuhl GS (1989) Factors affecting running economy. Sports Med 7:310–330
Nicol C, Komi PV, Marconnet P (1991) Fatigue effects of marathon running on neuromuscular performance. I. Changes in muscle force and stiffness characteristics. Scand J Med Sci Sports 1:10–17
Nilsson J, Thortensson A (1987) Adaptability in frequency and amplitude of leg movements during human locomotion at different speeds. Acta Physiol Scand 129:107–114
Rack MH (1981) Limitations of somatosensory feedback in control of posture and movement. In: Brooks V (ed) Handbook of physiology, the nervous system, vol. II Motor control. Williams and Wilkins, Baltimore, pp 229–256
Renault J (1991) Intervalle de confiance de l'estimation d'une espérance. Formulaire de probabilites et de statistiques. Dunod, Paris, pp 93–94
Shephard RJ (1992) Maximal oxygen intake. In: Shepard RJ, ⫗Astrand PO (eds) Endurance in sport, Blackwell Scientific Publications, Oxford; pp 192–200
Vagenas G, Hoshizaki B (1992) A multivariable analysis of lower extremity kinematic asymmetry in running. Int J Sports Biomech 8:11–29
Williams KR, Cavanagh PR (1987) Relationship between distance running mechanics, running economy and performance. J Appl Physiol 63:1236–1245
Williams KR, Snow RE, Jones JE (1989) A comparison of distance running kinematics between treadmill and competitive running and between genders. In: Gregar RJ, Zeknicke RF, Whiting WC (eds) Proceedings of XIIth Congress of International Society of Biomechanics [Abstr 139] Los Angeles, USA
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Belli, A., Lacour, J.R., Komi, P.V. et al. Mechanical step variability during treadmill running. Europ. J. Appl. Physiol. 70, 510–517 (1995). https://doi.org/10.1007/BF00634380
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DOI: https://doi.org/10.1007/BF00634380