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Durability of running economy: differences between quantification methods and performance status in male runners
Introduction Running economy (RE) deteriorates during prolonged running, although the effect of measuring energy cost (EC) or oxygen cost (OC) on the magnitude of these changes has not been investigated. Similarly, it is unknown if runners’ performance level may influence the deterioration of RE dur...
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2024
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| Online Access: | https://hdl.handle.net/2134/26538700.v1 |
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| author | Michele Zanini Jonathan Folland Richard Blagrove |
| author_facet | Michele Zanini Jonathan Folland Richard Blagrove |
| author_sort | Michele Zanini (8484084) |
| collection | Figshare |
| description | Introduction Running economy (RE) deteriorates during prolonged running, although the effect of measuring energy cost (EC) or oxygen cost (OC) on the magnitude of these changes has not been investigated. Similarly, it is unknown if runners’ performance level may influence the deterioration of RE during prolonged running. The aims of this study were to compare changes in EC and OC measurements of RE during a prolonged run in a large cohort of well-trained male runners, and to compare changes between runners of high and low performance standard. Methods Forty-four male runners (maximal oxygen uptake (V̇O2max) 62.4 ml·kg-1·min-1; 10 km time 35:50 ± 4:40 mm:ss) completed an incremental test determining lactate threshold 1 (LT1) and V̇O2max, and on a separate occasion, a 90 min run at LT1. Respiratory gases were collected at 15 min intervals. Subsequently, sub-groups of high- (HP, 10 km 31:20 ± 01:00 mm:ss) and low-performing (LP, 10 km 41:50 ± 01:20 mm:ss) runners were compared. Results RE deterioration was only fractionally larger when expressed as OC than EC (0.1% greater from 30-90 min; p < 0.001), perhaps due to the small change in RER (-0.01) in this study. For the HP group increases were lower than LP after 90 min in both EC (+2.3 vs +4.3%; p < 0.01) and OC (+2.4 vs +4.5%; p < 0.01). Similarly, at standardized distances, changes were lower for HP vs LP e.g. at 16.7 km +1.0 vs +3.2% for EC (p < 0.01), and + 1.2 vs +3.4% for OC (p < 0.001). Conclusions The deterioration of RE was dependent on athlete’s performance level, with HP runners displaying superior RE durability. The use of EC or OC had only a fractional influence on RE durability, although this may gain importance with larger shifts in substrate metabolism. |
| format | Default Article |
| id | rr-article-26538700 |
| institution | Loughborough University |
| publishDate | 2024 |
| record_format | Figshare |
| spelling | rr-article-265387002024-06-10T00:00:00Z Durability of running economy: differences between quantification methods and performance status in male runners Michele Zanini (8484084) Jonathan Folland (1254987) Richard Blagrove (6502469) Clinical sciences Medical physiology Health sciences Sports science and exercise resilience energy cost oxygen cost endurance marathon fatiguability <p><strong>Introduction</strong> Running economy (RE) deteriorates during prolonged running, although the effect of measuring energy cost (EC) or oxygen cost (OC) on the magnitude of these changes has not been investigated. Similarly, it is unknown if runners’ performance level may influence the deterioration of RE during prolonged running. The aims of this study were to compare changes in EC and OC measurements of RE during a prolonged run in a large cohort of well-trained male runners, and to compare changes between runners of high and low performance standard. </p> <p><strong>Methods</strong> Forty-four male runners (maximal oxygen uptake (V̇O2max) 62.4 ml·kg-1·min-1; 10 km time 35:50 ± 4:40 mm:ss) completed an incremental test determining lactate threshold 1 (LT1) and V̇O2max, and on a separate occasion, a 90 min run at LT1. Respiratory gases were collected at 15 min intervals. Subsequently, sub-groups of high- (HP, 10 km 31:20 ± 01:00 mm:ss) and low-performing (LP, 10 km 41:50 ± 01:20 mm:ss) runners were compared. </p> <p><strong>Results</strong> RE deterioration was only fractionally larger when expressed as OC than EC (0.1% greater from 30-90 min; p < 0.001), perhaps due to the small change in RER (-0.01) in this study. For the HP group increases were lower than LP after 90 min in both EC (+2.3 vs +4.3%; p < 0.01) and OC (+2.4 vs +4.5%; p < 0.01). Similarly, at standardized distances, changes were lower for HP vs LP e.g. at 16.7 km +1.0 vs +3.2% for EC (p < 0.01), and + 1.2 vs +3.4% for OC (p < 0.001). </p> <p><strong>Conclusions</strong> The deterioration of RE was dependent on athlete’s performance level, with HP runners displaying superior RE durability. The use of EC or OC had only a fractional influence on RE durability, although this may gain importance with larger shifts in substrate metabolism.</p> 2024-06-10T00:00:00Z Text Journal contribution 2134/26538700.v1 https://figshare.com/articles/journal_contribution/Durability_of_running_economy_differences_between_quantification_methods_and_performance_status_in_male_runners/26538700 CC BY-NC-ND 4.0 |
| spellingShingle | Clinical sciences Medical physiology Health sciences Sports science and exercise resilience energy cost oxygen cost endurance marathon fatiguability Michele Zanini Jonathan Folland Richard Blagrove Durability of running economy: differences between quantification methods and performance status in male runners |
| title | Durability of running economy: differences between quantification methods and performance status in male runners |
| title_full | Durability of running economy: differences between quantification methods and performance status in male runners |
| title_fullStr | Durability of running economy: differences between quantification methods and performance status in male runners |
| title_full_unstemmed | Durability of running economy: differences between quantification methods and performance status in male runners |
| title_short | Durability of running economy: differences between quantification methods and performance status in male runners |
| title_sort | durability of running economy: differences between quantification methods and performance status in male runners |
| topic | Clinical sciences Medical physiology Health sciences Sports science and exercise resilience energy cost oxygen cost endurance marathon fatiguability |
| url | https://hdl.handle.net/2134/26538700.v1 |