Browsing by Person "Bailey, A."

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Effects of antecedent flexibility conditioning on neuromuscular and sensorimotor performance during exercise-induced muscle damage
(Hong Kong Association of Sports Medicine & Sports Science, 2013-12) Gleeson, Nigel; Eston, R.; Minshull, Claire; Bailey, A.; Al Kitani, Abdul Hameed; Darain, Haider; Yates, C.; Rees, D.
The aim of this study was to assess the effects of two modes of antecedent flexibility conditioning on neuromuscular and sensorimotor performance during a subsequent episode of exercise-induced muscle damage (EIMD). Twenty-four males (age 20.9 2.3 years; height 1.78 0.06 m; body mass 72.3 7.4 kg, mean SD) were randomly assigned to interventions comprising 6 weeks of thrice-weekly flexibility conditioning of the hip region and knee flexor musculature in the dominant limb involving proprioceptive neuromuscular facilitation (n = 8), passive exercise (n = 8), or no exercise as a control (n = 8). Musculoskeletal, neuromuscular, and sensorimotor assessments were carried out at baseline, after conditioning, and before and up to 168 hours after damaging exercise of the ipsilateral knee flexors. Flexibility conditioning and EIMD elicited transient performance decreases in volitional electromechanical delay (up to 40.1% compared to baseline; 67.5 12.3 milliseconds vs. 47.9 9.7 milliseconds, mean SD, 48-hour post- vs. pre-EIMD; p < 0.01), passive hip flexibility (up to 19.9%; 96.7 8.2 vs. 120.7 11.0, p < 0.001) and sensorimotor capability (manifold error increase to 10.8%; 10.8% 6.9% vs. 0.3% 3.7%, p < 0.05) and exceeded the effects of eccentric exercise alone. EIMD-related performance decreases were especially prominent when preceded by passive flexibility conditioning, and were sufficiently potent following both modes of antecedent conditioning to raise concerns about compromised capability for rapid and dynamic stabilization of synovial joints. 2013.
Influence of surgery and rehabilitation conditioning on psychophysiological fitness
(Hong Kong Association of Sports Medicine & Sports Science, 2008) Gleeson, Nigel; Parfitt, G.; Minshull, Claire; Bailey, A.; Rees, D.
The purpose of this study was to assess changes in psychophysiological fitness following reconstructive knee surgery and early phase (2.5 months) physical rehabilitation. Nine patients (7 male, 2 female; mean age, 29.9 years) electing to undergo anterior cruciate ligament reconstructive surgery (central third, bone-patella tendon-bone graft) were assessed on four separate assessment occasions post-surgery. Repeated measures ANOVAs showed significant condition (injured/non-injured leg) by test occasion (2 weeks pre-surgery and 6, 8 and 10 weeks post-surgery) interactions for knee ligamentous compliance (anterior tibiofemoral displacement), peak force and electromechanical delay associated with the knee flexors of the injured and non-injured legs (F3,24 = 4.7 to 6.6; p < 0.01), together with individualized emotional profile disturbance scores that were significantly less at 10 weeks post-surgery compared to pre-surgery, 6 weeks and 8 weeks post-surgery (F3,4 = 7.6,; p < 0.01). Spearman rank correlation coefficients identified significant relationships between musculoskeletal fitness and emotional profile scores at pre-surgery (r = 0.69-0.72; p < 0.05) and at 8 weeks post-surgery (r = 0.70-0.73; p < 0.05). The 6 Bi-POMS subscales and the 12 ERAIQ responses found Inconsistent patterns of response and relationships across the assessment occasions. Overall, the patterning of changes and associations amongst emotional performance profile discrepancy scores in conjunction with those scores from indices of musculoskeletal fitness performance capability offered important support for the efficacy of an approach which integrates self-perceptive and objective measurements of fitness capability during rehabilitation following surgery to a synovial joint.
Repeated exercise stress impairs volitional but not magnetically evoked electromechanical delay of the knee flexors
(Taylor & Francis, 2012-01) Minshull, Claire; Eston, R.; Bailey, A.; Rees, D.; Gleeson, Nigel
The effects of serial episodes of fatigue and recovery on volitional and magnetically evoked neuromuscular performance of the knee flexors were assessed in 20 female soccer players during: (i) an intervention comprising 4 35 s maximal static exercise, and (ii) a control condition. Volitional peak force was impaired progressively (~16% vs. baseline: 235.3 54.7 to 198.1 38.5 N) by the fatiguing exercise and recovered to within ~97% of baseline values following 6 min of rest. Evoked peak twitch force was diminished subsequent to the fourth episode of exercise (23.3%: 21.4 13.8 vs. 16.4 14.6 N) and remained impaired at this level throughout the recovery. Impairment of volitional electromechanical delay performance following the first episode of exercise (25.5%: 55.3 11.9 vs. 69.5 24.5 ms) contrasted with concurrent improvement (10.0%: 24.5 4.7 vs. 22.1 5.0 ms) in evoked electromechanical delay (P < 0.05), and this increased disparity between evoked and volitional electromechanical delay remained during subsequent periods of intervention and recovery. The fatiguing exercise provoked substantial impairments to volitional strength and volitional electromechanical delay that showed differential patterns of recovery. However, improved evoked electromechanical delay performance might identify a dormant capability for optimal muscle responses during acute stressful exercise and an improved capacity to maintain dynamic joint stabilty during critical episodes of loading. 2012 Taylor & Francis.
Single measurement reliability and reproducibility of volitional and magnetically-evoked indices of neuromuscular performance in adults
(Elsevier, 2009) Minshull, Claire; Gleeson, Nigel; Eston, R.; Bailey, A.; Rees, D.
This study documents intra-session and inter-day reproducibility (coefficient of variation [V%]) and single measurement reliability (intra-class correlations [RI]; standard error of a single measurement [SEM%] [95% confidence limits]) of indices of neuromuscular performance elicited during peripheral nerve magnetic stimulation. Twelve adults (five men and seven women) completed 3 assessment sessions on 3 days, during which multiple assessments of knee flexor volitional and magnetically-evoked indices of electromechanical delay (EMDV; EMDE), rate of force development (RFDV; RFDE), peak force (PFV; PTFE), and compound muscle action potential latency (LATE) and amplitude (AMPE) were obtained. Results showed that magnetically-evoked indices of neuromuscular performance offered statistically equivalent levels of measurement reproducibility (V%: 4.3-31.2%) and reliability (RI: 0.98-0.51) compared to volitional indices (V%: 3.7-25.2%; RI: 0.98-0.64), which support the efficacy of both approaches to assessment and the indices PFV, EMDV, EMDE and LATE offer the greatest practical utility for assessing neuromuscular performance.
Single measurement reliability and reproducibility of volitional and magnetically-evoked indices of neuromuscular performance in adults
(Elsevier, 2009-10) Gleeson, Nigel; Minshull, Claire; Eston, R.; Bailey, A.; Rees, D.
This study documents intra-session and inter-day reproducibility (coefficient of variation [V%]) and single measurement reliability (intra-class correlations [RI]; standard error of a single measurement [SEM%] [95% confidence limits]) of indices of neuromuscular performance elicited during peripheral nerve magnetic stimulation. Twelve adults (five men and seven women) completed 3 assessment sessions on 3 days, during which multiple assessments of knee flexor volitional and magnetically-evoked indices of electromechanical delay (EMDV; EMDE), rate of force development (RFDV; RFDE), peak force (PFV; PTFE), and compound muscle action potential latency (LATE) and amplitude (AMPE) were obtained. Results showed that magnetically-evoked indices of neuromuscular performance offered statistically equivalent levels of measurement reproducibility (V%: 4.3–31.2%) and reliability (RI: 0.98–0.51) compared to volitional indices (V%: 3.7–25.2%; RI: 0.98–0.64), which support the efficacy of both approaches to assessment and the indices PFV, EMDV, EMDE and LATE offer the greatest practical utility for assessing neuromuscular performance.
The differential effects of PNF versus passive stretch conditioning on neuromuscular performance
(European College of Sport Science, 2014-04) Minshull, Claire; Eston, R.; Bailey, A.; Rees, D.; Gleeson, Nigel
The effects of flexibility conditioning on neuromuscular and sensorimotor performance were assessed near to full knee extension (25). Eighteen males who were randomly assigned into two groups underwent eight weeks (three-times per week) of flexibility conditioning (hip region/knee flexor musculature; dominant limb) involving either proprioceptive neuromuscular facilitation (PNF) (n=9) or passive stretching (PASS) (n=9). Both modes of flexibility conditioning are popular within contemporary exercise and clinical settings and have demonstrated efficacy in improving range of motion. The contralateral limb and a prior 'no exercise' condition were used as controls. The PNF and PASS modes of conditioning improved passive hip flexibility to a similar extent (mean 19.3% vs. baseline, intervention limb, p<0.01) but did not alter knee flexor strength (overall mean 309.681 N) or sensorimotor performance (force and positional errors: 2.38.2% and 0.487.1%). Voluntary and magnetically evoked electromechanical delays (EMDV and EMDE, respectively) were increased but to a greater extent following PASS compared to PNF (PASS: 10.8% and 16.9% lengthening of EMDV and EMDE, respectively vs. PNF: 3.2% and 6.2%, p<0.01).The attenuated change to electromechanical delay (EMD) performance during PNF conditioning suggests a preserved capability for rapid muscle activation, which is important in the maintenance of dynamic joint stability. That PNF was also equally efficacious in flexibility conditioning would suggest that this mode of flexibility training should be used over passive to help preserve dynamic joint stability capabilities at this extended and vulnerable joint position. 2013 Copyright European College of Sport Science.
The effects of non-concurrent strength and endurance rehabilitation on the neuromuscular and musculoskeletal performance of knees treated with autologous chondrocyte implantation (ACI).
(International Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine, 2007-05) Bailey, A.; Gleeson, Nigel; Rees, D.; Roberts, S.; Eston, R.; Richardson, J.
ACI remains a relatively new surgical technique for the treatment of chondral lesions in the knee. Studies are on going to provide evidence for the ideal tissue engineering and surgical techniques leading to the growth of hyaline cartilage. However, the post- operative rehabilitation plays an equal and important role in the outcome of the procedure. No studies to date have systematically addressed the utility and efficacy of post-surgical ACI rehabilitation, aimed specifically at improving physiological, functional and self-perceived capability. Neither are there any studies investigating whether or not the physiological processes, associated with concurrent conditioning for endurance performance, have been shown to attenuate strength performance or affect other indices of neuromuscular performance.