VARIABILITY OF HIP AND KNEE ANGLES DURING A-30 MINUTE RUN IN HEALTHY RUNNERS
Keywords:
Lower limbs / Variability / Running / TreadmillAbstract
Running is a popular activity, which is considered to be good for health, yet it may induce overuse injuries due to the repeated nature of the task. Thus, runner should avoid an overuse that could cause an injury. Movement variability of lower extremity is one of an interesting variable, however, the study of variability (hip and knee joint angle) during a 30-minute run has not been investigated in Thailand. Therefore, the aim of this study was to examine lower extremity variability during treadmill running over different durations. Seven healthy runners, consisting of five males and two females (age 33.6±12.5 yrs; weight 64.0±8.2 kg, height 171.3±7.9 cm; VO2max 46.9±5.3 mL∙kg-1∙min-1) ran on a treadmill at an individual running speed equivalent to 70% VO2max (7.3±1.3 km/hr). Retroreflective markers were placed on anatomical landmarks. 3-D kinematic data of right lower extremity during running were recorded using 10 cameras at 100-Hz. The running motion during the 1st and 30th minute of running consisted of 8 consecutive running cycles were selected and analyzed. Paired t-test showed a significant difference of hip angle between the 1st and 30th minute at initial contact. Furthermore, this study found the extent of variability in hip and knee joint angles at initial contact for between-participant. However, there were small changes in the coefficient of variation within-participant. The reduction in movement variability when running for 30 minutes may due to the absence of fatigue or the runners getting into their rhythms.
(Journal of Sports Science and Technology 2020; 20((Online Edition))
(Received: 5 May 2020, Revised: 15 July 2020, Accepted: 24 July 2020)
Key words: Lower limbs / Variability / Running / Treadmill
*Corresponding Author: Ampika NANBANCHA
College of Sports Science and Technology, Mahidol University,
Nakhon Pathom, THAILAND 73170
E-mail: weerawat.lim@mahidol.edu
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