Abstract
Running-related stress fractures have been associated with the overall impact intensity, which has recently been described through the loading rate (LR). Our purpose was to evaluate the effects of four acute interventions with specific focus on LR: wearing racing shoes (RACE), increasing step frequency by 10 % (FREQ), adopting a midfoot strike pattern (MIDFOOT) and combining these three interventions (COMBI). Nine rearfoot-strike subjects performed five 5-min trials during which running kinetics, kinematics and spring-mass behavior were measured for ten consecutive steps on an instrumented treadmill. Electromyographic activity of gastrocnemius lateralis, tibialis anterior, biceps femoris and vastus lateralis muscles was quantified over different phases of the stride cycle. LR was significantly and similarly reduced in MIDFOOT (37.4 ± 7.20 BW s−1, −56.9 ± 50.0 %) and COMBI (36.8 ± 7.15 BW s−1, −55.6 ± 29.2 %) conditions compared to NORM (56.3 ± 11.5 BW s−1, both P < 0.001). RACE (51.1 ± 9.81 BW s−1) and FREQ (52.7 ± 11.0 BW s−1) conditions had no significant effects on LR. Running with a midfoot strike pattern resulted in a significant increase in gastrocnemius lateralis pre-activation (208 ± 97.4 %, P < 0.05) and in a significant decrease in tibialis anterior EMG activity (56.2 ± 15.5 %, P < 0.05) averaged over the entire stride cycle. The acute attenuation of foot–ground impact seems to be mostly related to the use of a midfoot strike pattern and to a higher pre-activation of the gastrocnemius lateralis. Further studies are needed to test these results in prolonged running exercises and in the long term.
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Abbreviations
- BF:
-
Biceps femoris
- BW:
-
Body weight
- F max :
-
Maximal vertical ground reaction force
- Fz1 :
-
Magnitude of impact force peak
- GL:
-
Gastrocnemius lateralis
- k leg :
-
Leg stiffness
- k vert :
-
Vertical stiffness
- LR:
-
Vertical mean loading rate
- MFS:
-
Midfoot strike
- PSF+10% :
-
Preferred step frequency increased by10 %
- RFS:
-
Rearfoot strike
- t a :
-
Aerial time
- TA:
-
Tibialis anterior
- t c :
-
Contact time
- tFz1 :
-
Time to impact peak
- VGRF:
-
Vertical ground reaction force
- VL:
-
Vastus lateralis
- ΔL :
-
Maximal leg spring compression during contact
- Δz :
-
Vertical maximal downward displacement of the center of mass during contact
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Communicated by Jean-René Lacour.
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Giandolini, M., Arnal, P.J., Millet, G.Y. et al. Impact reduction during running: efficiency of simple acute interventions in recreational runners. Eur J Appl Physiol 113, 599–609 (2013). https://doi.org/10.1007/s00421-012-2465-y
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DOI: https://doi.org/10.1007/s00421-012-2465-y