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Lane, Jordan and Bansbach, Heather and Connaboy, Christopher and Darnell, Matthew and Keenan, Karen Ann and Lovalekar, Mita T and Nagai, Takashi and Allison, Katelyn Fleishman (2018) THE EFFECT OF LOADED FATIGUE ON LOADED POSTURAL STABILITY. Master's Thesis, University of Pittsburgh. (Unpublished)

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Military personnel are often required to carry heavy loads for long distances over unpredictable terrain. Additional load carriage, in conjunction with fatigue, has the potential to influence postural control mechanisms which may in turn increase injury risk. The purpose of this study was to determine if a loaded incremental march to fatigue negatively influences loaded postural stability. Loaded postural stability was measured using the NeuroCom Sensory Organization Test (SOT) and kinetic force plate variables (vertical ground reaction forces: SDvGRF, and TotSway) before and after a loaded incremental march to fatigue in 23 physically active men and women (age: 24.1  4.0 years, height: 172.3  11.1 cm, weight: 162.2  38.2 lbs) while subjects were adorned with a weighted vest equating to 30% of their body weight. The SOT consisted of six conditions (C1-C6) aimed to perturb the sensorimotor system, which were performed before and after a loaded fatigue protocol. C1, C2 and C3 challenged the somatosensory system, C4 challenged the visual system, while C5 and C6 challenged the vestibular system. Fatigue was induced with a treadmill march at 4mph with increasing grades of 2% every three minutes until volitional fatigue. After testing for normality, paired sample t-tests or Wilcoxon signed rank tests were conducted to assess pre- to post-fatigue differences. Significant reductions in SOT scores were found in overall composite scores (pre: 82.8  4.7, post: 81.6  5.2, p = 0.010), SDvGRF of C1 (pre: 1.3  0.5, post: 2.0  0.9, p < 0.001), C2 (pre: 1.4  0.6, post: 1.9  1.2, p < 0.001), C3 (pre: 1.4  0.5, post: 2.1  1.8, p = 0.026), and C6 (pre: 2.5  2.2, post: 3.5  3.2, p < 0.001) and TotSway of all conditions. Results suggest that significant changes in loaded postural stability were caused by loaded fatigue. Findings could aid in future postural stability screenings, load carriage training and strategies for injury prevention in the military.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Lane, Jordanjsl54@pitt.edujsl54
Darnell, Matthewmed30@pitt.eduMED30
Keenan, Karen Annkak170@pitt.eduKAK170
Lovalekar, Mita Tmital@pitt.eduMITAL
Allison, Katelyn Fleishmankaf14@pitt.eduKAF14
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairAllison, Katelyn
Committee MemberBansbach,
Committee MemberConnaboy,
Committee MemberDarnell,
Committee MemberKeenan, Karen
Committee MemberLovalekar, Mita
Committee MemberNagai,
Date: 10 January 2018
Date Type: Publication
Defense Date: 17 November 2017
Approval Date: 10 January 2018
Submission Date: 1 December 2017
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 112
Institution: University of Pittsburgh
Schools and Programs: School of Health and Rehabilitation Sciences > Sports Medicine and Nutrition
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Postural stability Load carriage NeuroCom SOT Fatigue
Date Deposited: 10 Jan 2018 15:11
Last Modified: 10 Jan 2018 15:11


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