Oxygen Uptake, Heart Rate, and Lactate Responses for Continuous Forward Running and Stop-and-Go Running With and Without Directional Changes

Nabyl Bekraoui; Boussaidi Boussaidi; Georges Cazorla; Luc A. Léger

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Oxygen Uptake, Heart Rate, and Lactate Responses for Continuous Forward Running and Stop-and-Go Running With and Without Directional Changes

Nabyl Bekraoui ^[1] ; Boussaidi Boussaidi ^[2] ; George Cazorla ^[3] ; Luc A. Léger
1. [1] University of Montreal
  
  University of Montreal
  
  Canadá
2. [2] Manouba University
  
  Manouba University
  
  Túnez
3. [3] Research Cell of French Soccer Federation, Paris, France
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Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 34, Nº. 3, 2020, págs. 699-707
Idioma: inglés
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Resumen
- The purpose of this study is to measure and quantify the differences for the gross oxygen uptake (V[Combining Dot Above]O2), heart rate (HR), and blood lactate ([LA]) responses to various modes of in-line running. Twelve healthy participants did an indirect continuous multistage field test to determine the maximal aerobic speed (MAS) before randomly performing in separate sessions 1 of the 3 running protocols at 3 intensities (60, 70, and 80% MAS) (a) in-line continuous running (IR), (b) fractioned running (FR) with stop and go every 20 m, and (c) 20-m shuttle run (SR). V[Combining Dot Above]O2 varied between 34.2 +/- 2.5 and 54.6 +/- 5.4 ml[middle dot]kg-1[middle dot]min-1, HR between 141 +/- 14 and 184 +/- 9 b[middle dot]min-1, and [LA] between 4.2 +/- 0.8 and 6.6 +/- 0.9 mmol[middle dot]L-1. In-line continuous running V[Combining Dot Above]O2 was lower than those of SR and FR at all intensities (p < 0.05). However, SR V[Combining Dot Above]O2 were higher than those of FR at 80% MAS only. Heart rate was similar in SR and FR but lower in IR at all intensities (p < 0.05). No significant differences were recorded in [LA]. Because only V[Combining Dot Above]O2 was affected by the introduction of a 180[degrees] angle directional change (SR vs. FR) at 80% MAS, the use of HR to assess such activities at such intensities will result in underestimating workloads. This study offers new insights into V[Combining Dot Above]O2, HR, and [LA] associated with accelerations while running with and without directional changes at submaximal speeds.