THE EFFECTS OF A STRETCH-SHORTENING CYCLE FATIGUE PROTOCOL ON KNEE KINEMATICS DURING RUNNING IN UNTRAINED CHILDREN
Journal Title: CITIUS ALTIUS FORTIUS - JOURNAL OF PHYSICAL EDUCATION AND SPORT - Year 2010, Vol 27, Issue 2
Abstract
The purpose of the current study was to examine the effects of an intensive stretch shortening-cycle (SSC) protocol (100 plyometric jumps) on knee kinematics during running on a treadmill in healthy children using 3D kinematics. Twelve healthy and untrained children volunteered. Their mean + age, height and weight was 10,1±0,5 years, 142± 6,1 cm and 37 ±4,6kg, respectively. Muscle damage of lower extremities was caused by 100 maximal intensity plyometric jumps performed as 10 sets of 10 continuous jumps with a 30 second rest period between sets. Muscle damage indicators [delayed onset muscle soreness (DOMS), knee-joint flexion/extension angles during running on a treadmill (speed at 2.8 m/s)] were assessed pre-, 0h, 24h, 48h and 72h post exercise. Kinematic data were captured at 100 Hz using a six-camera 3D motion analysis system (VICON 612). Repeated measures one-way ANOVA with five levels were utilised for the parameters. All muscle damage indicators revealed significant changes post- compared to pre-exercise data (p<0.05). Kinematic analysis revealed that the 100 plyometric jumps decreased knee-joint angles at different phases of stance (impact, support, push-off phase). These changes were more evident just after (0h) the protocol and 48h after this, and remained till 72h post at a great extent (p<0.05). Lastly, children suffered from delayed muscle soreness on their thigh muscles which remained only 24 hours after this (p<0.05). Muscle damage causes alterations in treadmill running in knee kinematics of untrained children probable due to differentiation of their central nervous system running strategy
Authors and Affiliations
Tsatalas T, Lazaridis S, Zaggelidis G, Kotzamanidis C
Keywords
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