Purpose: To examine the effects of the world’s most challenging mountain ultra-marathon (Tor des Géants® 2012) on the energy cost of three types of locomotion (cycling, level and uphill running) and running kinematics. Methods: Before (pre-) and immediately after (post-) the competition, a group of ten male experienced ultra-marathon runners performed in random order three submaximal 4-min exercise trials: cycling at a power of 1.5 W•kg-1 body mass; level running at 9 km•h-1 and uphill running at 6 km•h-1 at an inclination of +15% on a motorized treadmill. Two video cameras recorded running mechanics at different sampling rates. Results: Between pre- and post-, the uphill running energy cost decreased by 13.8% (P = 0.004); no change was noted in the energy cost of level running or cycling (NS). There was an increase in contact time (+10.3%, P = 0.019) and duty factor (+8.1%, P = 0.001) and a decrease in swing time (-6.4%, P = 0.008) in the uphill-running condition. Conclusion: After this extreme mountain ultra-marathon, the subjects modified only their uphill-running patterns for a more economical step mechanics.
Influence of the world’s most challenging mountain ultra-marathon on energy cost and running mechanics / G. Vernillo, A. Savoldelli, A. Zignoli, P. Trabucchi, B. Pellegrini, G.P. Millet, F. Schena. - In: EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY. - ISSN 1439-6319. - 114:5(2014), pp. 929-939. [10.1007/s00421-014-2824-y]
Influence of the world’s most challenging mountain ultra-marathon on energy cost and running mechanics
G. VernilloPrimo
;
2014
Abstract
Purpose: To examine the effects of the world’s most challenging mountain ultra-marathon (Tor des Géants® 2012) on the energy cost of three types of locomotion (cycling, level and uphill running) and running kinematics. Methods: Before (pre-) and immediately after (post-) the competition, a group of ten male experienced ultra-marathon runners performed in random order three submaximal 4-min exercise trials: cycling at a power of 1.5 W•kg-1 body mass; level running at 9 km•h-1 and uphill running at 6 km•h-1 at an inclination of +15% on a motorized treadmill. Two video cameras recorded running mechanics at different sampling rates. Results: Between pre- and post-, the uphill running energy cost decreased by 13.8% (P = 0.004); no change was noted in the energy cost of level running or cycling (NS). There was an increase in contact time (+10.3%, P = 0.019) and duty factor (+8.1%, P = 0.001) and a decrease in swing time (-6.4%, P = 0.008) in the uphill-running condition. Conclusion: After this extreme mountain ultra-marathon, the subjects modified only their uphill-running patterns for a more economical step mechanics.File | Dimensione | Formato | |
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