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

Abstract

Bekraoui, N, Boussaidi, L, Cazorla, G, and Léger, L. Oxygen uptake, heart rate, and lactate responses for continuous forward running and stop-and-go running with and without directional changes. J Strength Cond Res 34(3): 699–707, 2020—The purpose of this study is to measure and quantify the differences for the gross oxygen uptake (V̇o 2), 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). V̇o 2 varied between 34.2 ± 2.5 and 54.6 ± 5.4 ml·kg−1·min−1, HR between 141 ± 14 and 184 ± 9 b·min−1, and [LA] between 4.2 ± 0.8 and 6.6 ± 0.9 mmol·L−1. In-line continuous running V̇o 2 was lower than those of SR and FR at all intensities (p < 0.05). However, SR V̇o 2 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 V̇o 2 was affected by the introduction of a 180° 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 V̇o 2, HR, and [LA] associated with accelerations while running with and without directional changes at submaximal speeds.

Energy cost differences between marathon runners and soccer players: Constant versus shuttle running

“…Furthermore, these observations could explain the controversial on energy cost from previous studies ( Buchheit et al, 2011 ; Bekraoui et al, 2020 ). When the characteristics of runners are related to running task, the cardiorespiratory and metabolic results are clearly different between distance runners and soccer players.…”

“…• O 2max from previous studies (McArdle et al, 1978;Basset and Boulay, 2000), and extend our understanding of specificity for this important parameter in steady state versus intermittent condition of exercise. Furthermore, these observations could explain the controversial on energy cost from previous studies (Buchheit et al, 2011;Bekraoui et al, 2020). When the characteristics of runners are related to running task, the cardiorespiratory and metabolic results are clearly different between distance runners and soccer players.…”

Different Explosive Strength and Physiological Demands Between Male and Female Basketball Teams

“…The strength's decrease and the energy expenditure between the two groups (male and female) in the Shuttle run result more expensive compared to linear running (Bekraoui et al, 2020). In the shuttle run with the ball a significant difference was detected between the two groups, as it required more muscular work due to the deceleration and acceleration action on each change of direction and at more motor control of the ball (table 2, p = 0.00).…”

Applicability of Field Aerobic Fitness Tests in Soccer: Which One to Choose?

“…Namely, the difference between end-test speeds in 20mSRT and UMTT can inform the coach about the COD ability of their athletes, with smaller the difference the better the COD ability [42]. However, as this difference between end-test speeds can be highly variable [130], the cardiorespiratory responses of straight-line running prescribed through the results obtained with the 20mSRT could also appear highly variable [15]. Therefore, it would be very hard to capture the ideal acute cardiorespiratory response during long format HIIT if the 20mSRT is used for training prescription.…”

“…Due to differences in execution, these field tests provide different end-test speeds which are specific to the nature of the effort made during the test. Specifically, introducing changes of direction every 20 m into straight-line running yields higher oxygen uptake (VO 2 ), heart rate, blood lactate concentration and Rating of Perceived Exertion responses [14,15] which leads to exhaustion at significantly lower end-test speeds during shuttle tests in comparison to incremental straight-line tests [16]. Similarly, omitting inter-effort recoveries while performing the 30-15IFT results in reaching exhaustion at significantly lower end-test speed [17].…”