The effect of exercise intensity on joint power and dynamics in ergometer double-poling performed by cross-country skiers

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From: Human Movement Science(Vol. 57)
Publisher: Elsevier B.V.
Document Type: Article
Length: 449 words

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To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1016/j.humov.2017.11.010 Byline: Jorgen Danielsen [jorgen.danielsen@ntnu.no] (*), Oyvind Sandbakk, David McGhie, Gertjan Ettema Keywords Dynamic constraints; Power; Mechanical energy; Force; Cross-country skiing Highlights * Most power is generated by the hip during recovery and shoulder during poling. * Increasing double poling intensity is realized by increased lower body contribution. * Handling of dynamic constraints and possible energy flow mechanisms are discussed. Abstract The purpose of this study was to examine the effect of increasing exercise intensity on the role of joint powers in ergometer double poling (DP), while taking specific dynamic constraints into account. One main question was whether lower-body power contribution increased or decreased with increasing intensity. Nine male Norwegian national-level cross-country skiers performed ergometer DP at low, moderate, high and maximal intensity. Kinematics, and ground (GRF) and poling (F.sub.poling) reaction forces were recorded and used in link segment modeling to obtain joint and whole-body dynamics. Joint powers were averaged over the cycle, the poling (PP) and recovery (RP) phases. The contribution of these average powers was their ratios to cycle average poling power. At all intensities, the shoulder (in PP) and hip (mostly in RP) generated most power. Averaged over the cycle, lower-body contribution (sum of ankle, knee and hip power) increased from ~37% at low to ~54% at maximal intensity (p Author Affiliation: Center for Elite Sports Research, Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology, Trondheim, Norway * Corresponding author at: Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, 7489 Trondheim, Norway. Article History: Received 5 September 2017; Revised 3 November 2017; Accepted 18 November 2017

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Gale Document Number: GALE|A544585460