Abstract
Purpose
To estimate the energetics and biomechanics of accelerated/decelerated running on flat terrain based on its biomechanical similarity to constant speed running up/down an ‘equivalent slope’ dictated by the forward acceleration (a f).
Methods
Time course of a f allows one to estimate: (1) energy cost of sprint running (C sr), from the known energy cost of uphill/downhill running, and (2) instantaneous (specific) mechanical accelerating power (P sp = a f × speed).
Results
In medium-level sprinters (MLS), C sr and metabolic power requirement (P met = C sr × speed) at the onset of a 100-m dash attain ≈50 J kg−1 m−1, as compared to ≈4 for running at constant speed, and ≈90 W kg−1. For Bolt’s current 100-m world record (9.58 s) the corresponding values attain ≈105 J kg−1 m−1 and ≈200 W kg−1. This approach, as applied by Osgnach et al. (Med Sci Sports Exerc 42:170–178, 2010) to data obtained by video-analysis during soccer games, has been implemented in portable GPS devices (GPEXE©), thus yielding P met throughout the match. Actual O2 consumed, estimated from P met assuming a monoexponential VO2 response (Patent Pending, TV2014A000074), was close to that determined by portable metabolic carts. Peak P sp (W kg−1) was 17.5 and 19.6 for MLS and elite soccer players, and 30 for Bolt. The ratio of horizontal to overall ground reaction force (per kg body mass) was ≈20 % larger, and its angle of application in respect to the horizontal ≈10° smaller, for Bolt, as compared to MLS. Finally, we estimated that, on a 10 % down-sloping track Bolt could cover 100 m in 8.2 s.
Conclusions
The above approach can yield useful information on the bioenergetics and biomechanics of accelerated/decelerated running.
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Abbreviations
- a(t):
-
Acceleration at time t
- a f :
-
Forward acceleration
- aLa:
-
Alactic oxygen debt
- C 0 :
-
Energy cost of running at constant speed on flat terrain (J kg−1 m−1)
- COM:
-
Centre of mass
- C r :
-
Energy cost of running (J kg−1 m−1)
- C sr :
-
Energy cost of sprint running (J kg−1 m−1)
- Ean:
-
Anaerobic energy
- ED:
-
Equivalent distance: distance covered running at constant speed on flat terrain, for a given energy expenditure
- EDI:
-
Equivalent Distance Index: ratio between ED and actual distance covered
- EM:
-
Equivalent body mass
- ES:
-
Equivalent slope = tan (90 − α)
- F :
-
Force
- F acc :
-
Force acting on the subject during accelerated running: M g′
- F cost :
-
Force acting on the subject during constant speed running: M g
- g :
-
Acceleration of gravity
- g′:
-
Vectorial sum of af and g: \(g^{\prime} = \sqrt {a_{f}^{2} + g^{2} }\)
- H :
-
Horizontal
- i :
-
Incline of the terrain
- k :
-
Constant relating mechanical work against the air resistance (per unit body mass) and speed squared (≈0.0025 J s2 kg−1 m−3)
- M :
-
Body mass
- P g :
-
Mechanical power against gravity
- P req :
-
Metabolic power requirement (in equivalent oxygen units)
- P sp :
-
Specific mechanical power
- P tot :
-
Total mechanical power
- T :
-
Terrain
- v(f):
-
Final velocity
- v(t):
-
Velocity at time t
- VO2 :
-
Oxygen consumption (ml kg−1 min−1 or W kg−1)
- VO2 (s):
-
Oxygen consumption at steady state
- VO2 (t):
-
Oxygen consumption at time t
- VO2eff:
-
Actual oxygen consumption
- VO2max:
-
Maximal oxygen consumption
- VO2T:
-
Theoretical oxygen consumption
- v v :
-
Vertical velocity
- α :
-
Angle between T and H
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Acknowledgments
The financial support of Udinese Calcio SpA and of the Lions Club Udine Duomo is gratefully acknowledged.
Conflict of interest
The authors declare to be interested in the commercial development and utilisation of the system GPEXE© (Exelio srl, Udine, Italy).
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Communicated by Nigel A.S. Taylor.
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di Prampero, P.E., Botter, A. & Osgnach, C. The energy cost of sprint running and the role of metabolic power in setting top performances. Eur J Appl Physiol 115, 451–469 (2015). https://doi.org/10.1007/s00421-014-3086-4
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DOI: https://doi.org/10.1007/s00421-014-3086-4