Reza Mansourizadeh1, Amir Letafatkar2, Andrew Franklyn-Miller3, Mehdi Khaleghi-Tazji4, Julien S Baker5. 1. Faculty of Physical Education and Sports Sciences, Kharazmi University, Tehran, Iran. 2. Faculty of Physical Education and Sports Sciences, Kharazmi University, Tehran, Iran. Electronic address: amir.letafatkar@khu.ac.ir. 3. Centre for Health, Exercise and Sports Medicine, University of Melbourne, Melbourne, Victoria, Australia; Sports Surgery Clinic, Dublin, Ireland. 4. Centre for Health, Exercise and Sports Medicine, University of Melbourne, Melbourne, Victoria, Australia. 5. Institute of Exercise Science, Hong Kong Baptist University, Hong Kong. Electronic address: jsbaker@hkbu.edu.hk.
Abstract
BACKGROUND: Long-standing groin pain (LSGP) is a chronic painful condition resulting in both impaired performance and time loss from participation in multidirectional field sport. RESEARCH QUESTION: What are the differences in intersegmental coordination strategy and variability of trunk-pelvic and thigh coupling during change of direction in subjects with athletic LSGP and asymptomatic control subjects? METHODS: A motion analysis system was used to collect 3-D kinematic data of the continuous relative phase and the variability of the right and left leg hip. Thoracic-thigh segment data were also collected during multiple ipsilateral turns at a self-selected pace from 16 males with LSGP and 16 asymptomatic controls. It is worth mentioning that, for a more detailed analysis, we divided each cycle diagram into four phases. Independent T-tests were used to compare the two groups. RESULTS: Subjects with LSGP demonstrate except in phase 2 of the left foot, more out-of-phase movement with both increased variabilities in right/ left thigh - pelvic coupling, right/ left thigh-thoracic, and pelvic- thoracic in every 4 phases and in the decoupling of segmental coordination. SIGNIFICANCE: Decrease in coordination with higher variability is apparent in subjects with LSGP and this aberrant coordination may lead to unexpected compensatory strategies and control impairments.
BACKGROUND: Long-standing groin pain (LSGP) is a chronic painful condition resulting in both impaired performance and time loss from participation in multidirectional field sport. RESEARCH QUESTION: What are the differences in intersegmental coordination strategy and variability of trunk-pelvic and thigh coupling during change of direction in subjects with athletic LSGP and asymptomatic control subjects? METHODS: A motion analysis system was used to collect 3-D kinematic data of the continuous relative phase and the variability of the right and left leg hip. Thoracic-thigh segment data were also collected during multiple ipsilateral turns at a self-selected pace from 16 males with LSGP and 16 asymptomatic controls. It is worth mentioning that, for a more detailed analysis, we divided each cycle diagram into four phases. Independent T-tests were used to compare the two groups. RESULTS: Subjects with LSGP demonstrate except in phase 2 of the left foot, more out-of-phase movement with both increased variabilities in right/ left thigh - pelvic coupling, right/ left thigh-thoracic, and pelvic- thoracic in every 4 phases and in the decoupling of segmental coordination. SIGNIFICANCE: Decrease in coordination with higher variability is apparent in subjects with LSGP and this aberrant coordination may lead to unexpected compensatory strategies and control impairments.