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European Journal of Applied Physiology

, Volume 115, Issue 5, pp 1135–1145 | Cite as

Influence of short-term unweighing and reloading on running kinetics and muscle activity

  • Patrick SaintonEmail author
  • Caroline Nicol
  • Jan Cabri
  • Joëlle Barthelemy-Montfort
  • Eric Berton
  • Pascale Chavet
Original Article

Abstract

Purpose

In running, body weight reduction is reported to result in decreased lower limb muscle activity with no change in the global activation pattern (Liebenberg et al. in J Sports Sci 29:207–214). Our study examined the acute effects on running mechanics and lower limb muscle activity of short-term unweighing and reloading conditions while running on a treadmill with a lower body positive pressure (LBPP) device.

Method

Eleven healthy males performed two randomized running series of 9 min at preferred speed. Each series included three successive running conditions of 3 min [at 100 % body weight (BW), 60 or 80 % BW, and 100 % BW]. Vertical ground reaction force and center of mass accelerations were analyzed together with surface EMG activity recorded from six major muscles of the left lower limb for the first and last 30 s of each running condition. Effort sensation and mean heart rate were also recorded.

Result

In both running series, the unloaded running pattern was characterized by a lower step frequency (due to increased flight time with no change in contact time), lower impact and active force peaks, and also by reduced loading rate and push-off impulse. Amplitude of muscle activity overall decreased, but pre-contact and braking phase extensor muscle activity did not change, whereas it was reduced during the subsequent push-off phase.

Conclusion

The combined neuro-mechanical changes suggest that LBPP technology provides runners with an efficient support during the stride. The after-effects recorded after reloading highlight the fact that 3 min of unweighing may be sufficient for updating the running pattern.

Keywords

Running Unweighing Reloading SSC EMG GRF 

Abbreviations

APF

Active peak force

BEG

First 30 s sample of each running condition

BW

Body weight

CoM

Center of mass

HB

Vertical displacement of CoM during the braking phase

EMG

Electromyography

END

Last 30 s sample of each running condition

Fz

Vertical ground reaction force

GRF

Ground reaction force

GaL

Gastrocnemius lateralis

GaM

Gastrocnemius medialis

IPF

Impact peak force

kvert

Vertical stiffness

LBPP

Lower body positive pressure

MF

Minimal force after IPF

RLD

Reloading

RPE

Rating of perceived exertion

SOL

Soleus

SSC

Stretch-shortening cycle

TA

Tibialis anterior

UNW

Unweighing

VL

Vastus lateralis

VM

Vastus medialis

Notes

Acknowledgments

We are particularly grateful for the assistance given by Dr. Antoine Morice and Dr. Cedric Morio for data analyses.

Conflict of interest

None of the authors had any financial or personal conflict of interest with regard to this study.

References

  1. Avela J, Santos PM, Kyröläinen H, Komi PV (1994) Effects of different simulated gravity conditions on neuromuscular control in drop jump exercises. Aviat Space Environ Med 65:301–308PubMedGoogle Scholar
  2. Avela J, Santos PM, Komi PV (1996) Effects of differently induced stretch loads on neuromuscular control in drop jump exercise. Eur J Appl Physiol 72:553–562CrossRefGoogle Scholar
  3. Borg G (1970) Perceived exertion as an indicator of somatic stress. Scand J Rehab Med 2:92–98Google Scholar
  4. Chang YH, Huang HW, Hamerski CM, Kram R (2000) The independent effects of gravity and inertia on running mechanics. J Exp Biol 203:229–238PubMedGoogle Scholar
  5. Cronin NJ, Carty CP, Barrett RS (2011) Triceps surae short latency stretch reflexes contribute to ankle stiffness regulation during human running. PLoS ONE 6:e23917CrossRefPubMedCentralPubMedGoogle Scholar
  6. De Witt JK, Hagan RD, Cromwell RL (2008) The effect of increasing inertia upon vertical ground reaction forces and temporal kinematics during locomotion. J Exp Biol 211:1087–1092CrossRefPubMedGoogle Scholar
  7. De Witt JK, Perusek GP, Lewandowski BE et al (2010) Locomotion in simulated and real microgravity: horizontal suspension vs. parabolic flight. Aviat Space Environ Med 81:1092–1099CrossRefPubMedGoogle Scholar
  8. Di Prampero PE, Narici MV (2003) Muscles in microgravity: from fibres to human motion. J Biomech 36(3):403–412CrossRefPubMedGoogle Scholar
  9. Divert C, Mornieux G, Baur H et al (2005) Mechanical comparison of barefoot and shod running. Int J Sports Med 26:593–598CrossRefPubMedGoogle Scholar
  10. Donelan JM, Kram R (1997) The effect of reduced gravity on the kinematics of human walking: a test of the dynamic similarity hypothesis for locomotion. J Exp Biol 200:3193–3201PubMedGoogle Scholar
  11. Donelan JM, Kram R (2000) Exploring dynamic similarity in human running using simulated reduced gravity. J Exp Biol 203:2405–2415PubMedGoogle Scholar
  12. Farley CT, McMahon TA (1992) Energetics of walking and running: insights from simulated reduced-gravity experiments. J Appl Physiol 73:2709–2712PubMedGoogle Scholar
  13. Ferris DP, Louie M, Farley CT (1998) Running in the real world: adjusting leg stiffness for different surfaces. Proc R Soc Lond B Biol Sci 265:989–994CrossRefGoogle Scholar
  14. Ferris DP, Liang K, Farley CT (1999) Runners adjust leg stiffness for their first step on a new running surface. J Biomech 32:787–794CrossRefPubMedGoogle Scholar
  15. Ferris DP, Aagaard P, Simonsen EB et al (2001) Soleus H-reflex gain in humans walking and running under simulated reduced gravity. J Physiol 530:167–180CrossRefPubMedCentralPubMedGoogle Scholar
  16. Galindo A, Barthelemy J, Ishikawa M et al (2008) Neuromuscular control in landing from supra-maximal dropping height. J Appl Physiol 106:539–547CrossRefPubMedGoogle Scholar
  17. Gosseye TP, Heglund NC (2010) Biomechanical analysis of running in weightlessness on a treadmill equipped with a subject loading system. Eur J Appl Physiol 110:709–728CrossRefPubMedGoogle Scholar
  18. Grabowski AM (2010) Metabolic and biomechanical effects of velocity and weight support using a lower-body positive pressure device during walking. Arch Phys Med Rehabil 91:951–957CrossRefPubMedGoogle Scholar
  19. Grabowski AM, Kram R (2008) Effects of velocity and weight support on ground reaction forces and metabolic power during running. J Appl Biomech 24:288–297PubMedGoogle Scholar
  20. He JP, Kram R, McMahon TA (1991) Mechanics of running under simulated low gravity. J Appl Physiol 71:863–870PubMedGoogle Scholar
  21. Hermens HJ, Freriks B, Disselhorst-Klug C, Rau G (2000) Development of recommendations for SEMG sensors and sensor placement procedures. J Electromyogr Kinesiol 10:361–374CrossRefPubMedGoogle Scholar
  22. Hunter I, Seeley MK, Hopkins JT et al (2014) EMG activity during positive-pressure treadmill running. J Electromyogr Kinesiol 24:348–352CrossRefPubMedGoogle Scholar
  23. Ishikawa M, Komi PV (2008) Muscle fascicle and tendon behavior during human locomotion revisited. Exerc Sport Sci Rev 36(4):193–199CrossRefPubMedGoogle Scholar
  24. Komi PV, Nicol C (2008) Stretch-shortening cycle of muscle function. In: Komi PV (ed) The encyclopedia of sports medicine: neuromuscular aspects of sports performance, Chap 2. Wiley–Blackwell Publishing, pp 15–31Google Scholar
  25. Komi PV, Gollhofer A, Schmidtbleicher D, Frick U (1987) Interaction between man and shoe in running: considerations for a more comprehensive measurement approach. Int J Sports Med 8:196–202CrossRefPubMedGoogle Scholar
  26. Lackner JR, DiZio P (1996) Motor function in microgravity: movement in weightlessness. Curr Opin Neurobiol 6:744–750CrossRefPubMedGoogle Scholar
  27. Lavcanska V, Taylor NF, Schache AG (2005) Familiarization to treadmill running in young unimpaired adults. Hum Mov Sci 24:544–557CrossRefPubMedGoogle Scholar
  28. Layne CS, Lange GW, Pruett CJ et al (1998) Adaptation of neuromuscular activation patterns during treadmill walking after long-duration space flight. Acta Astronaut 43(3–6):107–119CrossRefPubMedGoogle Scholar
  29. Liebenberg J, Scharf J, Forrest D et al (2011) Determination of muscle activity during running at reduced body weight. J Sports Sci 29:207–214CrossRefPubMedGoogle Scholar
  30. McMahon TA, Cheng GC (1990) The mechanics of running: how does stiffness couple with speed? J Biomech 23(Suppl 1):65–78CrossRefPubMedGoogle Scholar
  31. Minetti AE, Pavei G, Biancardi CM (2012) The energetics and mechanics of level and gradient skipping: preliminary results for a potential gait of choice in low gravity environments. Planet Space Sci 74:142–145CrossRefGoogle Scholar
  32. Morio C, Nicol C, Barla C et al (2012) Acute and 2 days delayed effects of exhaustive stretch-shortening cycle exercise on barefoot walking and running patterns. Eur J Appl Physiol 112:2817–2827CrossRefPubMedGoogle Scholar
  33. Patil S, Steklov N, Bugbee WD et al (2013) Anti-gravity treadmills are effective in reducing knee forces. J Orthop Res 31:672–679CrossRefPubMedGoogle Scholar
  34. Regueme SC, Nicol C, Barthèlemy J, Grélot L (2005) Acute and delayed neuromuscular adjustments of the triceps surae muscle group to exhaustive stretch-shortening cycle fatigue. Eur J Appl Physiol 93:398–410CrossRefPubMedGoogle Scholar
  35. Santello M, McDonagh MJ (1998) The control of timing and amplitude of EMG activity in landing movements in humans. Exp Physiol 83:857–874CrossRefPubMedGoogle Scholar
  36. Santello M, McDonagh MJ, Challis JH (2001) Visual and non-visual control of landing movements in humans. J Physiol 537:313–327CrossRefPubMedCentralPubMedGoogle Scholar
  37. Segers V, Lenoir M, Aerts P, De Clercq D (2007) Kinematics of the transition between walking and running when gradually changing speed. Gait Posture 26:349–361CrossRefPubMedGoogle Scholar
  38. Shih Y, Lin K, Shiang T (2013) Is the foot striking pattern more important than barefoot or shod conditions in running? Gait Posture 38:490–494CrossRefPubMedGoogle Scholar
  39. Taube W, Leukel C, Lauber B, Gollhofer A (2012) The drop height determines neuromuscular adaptations and changes in jump performance in stretch-shortening cycle training. Scand J Med Sci Sports 22:671–683CrossRefPubMedGoogle Scholar
  40. Taylor J, Komi PV, Nicol C (2008) Central and neuromuscular fatigue. In: Nigel Taylor, Groeller H, McLennan PL (eds) Physiological bases of human performance during work and exercise, Sect 1, Chap 5. Churchill Livingstone, pp 91–113Google Scholar
  41. Yates JW, Mohney LE, Abel MG, Shapiro R (2011) Effect of unweighting using the Alter-G trainer on VO2, heart rate and perceived exertion. Med Sci Sports Exerc 43(5):779CrossRefGoogle Scholar
  42. Zadpoor AA, Nikooyan AA (2011) The relationship between lower-extremity stress fractures and the ground reaction force: a systematic review. Clin Biomech 26(1):23–28CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Patrick Sainton
    • 1
    Email author
  • Caroline Nicol
    • 1
    • 2
  • Jan Cabri
    • 2
  • Joëlle Barthelemy-Montfort
    • 1
  • Eric Berton
    • 1
  • Pascale Chavet
    • 1
  1. 1.Aix Marseille Université, CNRS, ISM UMR 7287MarseilleFrance
  2. 2.Department of Physical PerformanceNorwegian School of Sport SciencesOsloNorway

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