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Title: Interaction Between Leg Muscle Performance and Sprint Acceleration Kinematics
Contributor(s): Lockier, Robert (author); Jalilvand, Farzad (author); Callaghan, Samuel (author); Jeffriess, Matthew (author); Murphy, Aron  (author)
Publication Date: 2015
Open Access: Yes
DOI: 10.1515/hukin-2015-0109Open Access Link
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Abstract: This study investigated relationships between 10 m sprint acceleration, step kinematics (step length and frequency, contact and flight time), and leg muscle performance (power, stiffness, strength). Twenty-eight field sport athletes completed 10 m sprints that were timed and filmed. Velocity and step kinematics were measured for the 0-5, 5- 10, and 0-10 m intervals to assess acceleration. Leg power was measured via countermovement jumps (CMJ), a fivebound test (5BT), and the reactive strength index (RSI) defined by 40 cm drop jumps. Leg stiffness was measured by bilateral and unilateral hopping. A three-repetition maximum squat determined strength. Pearson's correlations and stepwise regression (p ≤ 0.05) determined velocity, step kinematics, and leg muscle performance relationships. CMJ height correlated with and predicted velocity in all intervals (r = 0.40-0.54). The 5BT (5-10 and 0-10 m intervals) and RSI (5-10 m interval) also related to velocity (r = 0.37-0.47). Leg stiffness did not correlate with acceleration kinematics. Greater leg strength related to and predicted lower 0-5m flight times (r = -0.46 to -0.51), and a longer 0-10 m step length (r = 0.38). Although results supported research emphasizing the value of leg power and strength for acceleration, the correlations and predictive relationships (r² = 0.14-0.29) tended to be low, which highlights the complex interaction between sprint technique and leg muscle performance. Nonetheless, given the established relationships between speed, leg power and strength, strength and conditioning coaches should ensure these qualities are expressed during acceleration in field sport athletes.
Publication Type: Journal Article
Source of Publication: Journal of Human Kinetics, 49(1), p. 65-74
Publisher: Akademia Wychowania Fizycznego w Katowicach [Academy of Physical Education in Katowice]
Place of Publication: Poland
ISSN: 1899-7652
Field of Research (FOR): 110601 Biomechanics
110602 Exercise Physiology
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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