Key result
Respiratory frequency showed large correlations with rating of perceived exertion during both 15:30-second (r = .87) and 30:15-second (r = .85) high-intensity interval training protocols.
Why the study?
Current variables used to monitor soccer training fail to capture physiological demands during high-intensity accelerations, decelerations, and directional changes.
Does respiratory frequency (fR) accurately reflect physical effort during shuttle-run HIIT in soccer players compared to heart rate and oxygen uptake?
Does respiratory frequency (fR) accurately reflect physical effort during shuttle-run HIIT in soccer players compared to heart rate and oxygen uptake?
Absolute Event Rate: 0.87% vs 0.85%
p-value: p=<.001
Respiratory frequency is a valid and responsive marker of physical effort during shuttle-run high-intensity interval training in soccer players, overcoming the delayed responses seen with heart rate and oxygen uptake.
Respiratory frequency may proxy RPE during HIIT; hypothesis-generating for athlete monitoring and requires prospective validation before practice change.
PURPOSE: Variables currently used in soccer training monitoring fail to represent the physiological demand of the player during movements like accelerations, decelerations, and directional changes performed at high intensity. We tested the hypothesis that respiratory frequency (fR) is a marker of physical effort during soccer-related high-intensity exercise. METHODS: A total of 12 male soccer players performed a preliminary intermittent incremental test and 2 shuttle-run high-intensity interval training (HIIT) protocols, in separate visits. The 2 HIIT protocols consisted of 12 repetitions over 9 minutes and differed in the work-to-recovery ratio (15:30 vs 30:15 s). Work rate was self-paced by participants to achieve the longest possible total distance in each HIIT protocol. RESULTS: Work-phase average metabolic power was higher (P < .001) in the 15:30-second protocol (31.7 [3.0] W·kg-1) compared with the 30:15-second protocol (22.8 [2.0] W·kg-1). Unlike heart rate and oxygen uptake, fR showed a fast response to the work-recovery alternation during both HIIT protocols, resembling changes in metabolic power even at supramaximal intensities. Large correlations (P < .001) were observed between fR and rating of perceived exertion during both 15:30-second (r = .87) and 30:15-second protocols (r = .85). CONCLUSIONS: Our findings suggest that fR is a good marker of physical effort during shuttle-run HIIT in soccer players. These findings have implications for monitoring training in soccer and other team sports.
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Nicolò et al. (2019) studied Healthy soccer players (n=12). 15:30-second shuttle-run HIIT protocol vs. 30:15-second shuttle-run HIIT protocol was evaluated on Correlation between respiratory frequency (fR) and rating of perceived exertion (RPE) (p=<.001). Respiratory frequency showed large correlations with rating of perceived exertion during both 15:30-second (r = .87) and 30:15-second (r = .85) high-intensity interval training protocols.
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