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https://www.readbyqxmd.com/read/27876459/local-and-widespread-hyperalgesia-in-female-runners-with-patellofemoral-pain-are-influenced-by-running-volume
#1
Marcella Ferraz Pazzinatto, Danilo de Oliveira Silva, Juliana Pradela, Maira Bergamaschi Coura, Christian Barton, Fábio Mícolis de Azevedo
OBJECTIVES: To compare pressure pain threshold (PPT) around the knee (local hyperalgesia) and at a site remote to the knee (widespread hyperalgesia) between female runners with and without patellofemoral pain (PFP); and to evaluate the relationship between running volume, self-reported knee function and PPT measures. DESIGN: Cross-sectional study. METHODS: Twenty female runners with PFP and twenty pain-free female runners participated in the study...
November 11, 2016: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/27852157/acute-and-chronic-effects-of-aquatic-treadmill-training-on-land-treadmill-running-kinematics-a-cross-over-and-single-subject-design-approach
#2
Eadric Bressel, Talin J Louder, James P Hoover, Luke C Roberts, Dennis G Dolny
The aim of this study was to determine if selected kinematic measures (foot strike index [SI], knee contact angle and overstride angle) were different between aquatic treadmill (ATM) and land treadmill (LTM) running, and to determine if these measures were altered during LTM running as a result of 6 weeks of ATM training. Acute effects were tested using 15 competitive distance runners who completed 1 session of running on each treadmill type at 5 different running speeds. Subsequently, three recreational runners completed 6 weeks of ATM training following a single-subject baseline, intervention and withdrawal experiment...
November 17, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27834504/redistribution-of-mechanical-work-at-the-knee-and-ankle-joints-during-fast-running-in-minimalist-shoes
#3
Joel T Fuller, Jonathan D Buckley, Margarita D Tsiros, Nicholas A T Brown, Dominic Thewlis
CONTEXT:  Minimalist shoes have been suggested as a way to alter running biomechanics to improve running performance and reduce injuries. However, to date, researchers have only considered the effect of minimalist shoes at slow running speeds. OBJECTIVE:  To determine if runners change foot-strike pattern and alter the distribution of mechanical work at the knee and ankle joints when running at a fast speed in minimalist shoes compared with conventional running shoes...
November 11, 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27803620/a-comparison-of-stride-length-and-lower-extremity-kinematics-during-barefoot-and-shod-running-in-well-trained-distance-runners
#4
Peter Francis, James Ledingham, Sarah Clarke, D J Collins, Philip Jakeman
Stride length, hip, knee and ankle angles were compared during barefoot and shod running on a treadmill at two speeds. Nine well-trained (1500m time: 3min:59.80s ± 14.7 s) male (22 ±3 years; 73 ±9 kg; 1.79 ±0.4 m) middle distance (800 m - 5,000 m) runners performed 2 minutes of running at 3.05 m·s(-1) and 4.72 m·s(-1) on an treadmill. This approach allowed continuous measurement of lower extremity kinematic data and calculation of stride length. Statistical analysis using a 2X2 factorial ANOVA revealed speed to have a main effect on stride length and hip angle and footwear to have a main effect on hip angle...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27770784/effects-of-two-neuromuscular-training-programs-on-running-biomechanics-with-load-carriage-a-study-protocol-for-a-randomised-controlled-trial
#5
Bernard X W Liew, Susan Morris, Justin W L Keogh, Brendyn Appleby, Kevin Netto
BACKGROUND: In recent years, athletes have ventured into ultra-endurance and adventure racing events, which tests their ability to race, navigate, and survive. These events often require race participants to carry some form of load, to bear equipment for navigation and survival purposes. Previous studies have reported specific alterations in biomechanics when running with load which potentially influence running performance and injury risk. We hypothesize that a biomechanically informed neuromuscular training program would optimize running mechanics during load carriage to a greater extent than a generic strength training program...
October 22, 2016: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27735232/lower-extremity-joint-work-during-acceleration-deceleration-and-steady-state-running
#6
D S Blaise Williams, Jonathan H Cole, Douglas W Powell
Running during sports and for physical activity often requires changes in velocity through acceleration and deceleration. While it is clear that lower extremity biomechanics vary during these accelerations and decelerations, the work requirements of the individual joints are not well understood. The purpose of this investigation was to measure the sagittal plane mechanical work of the individual lower extremity joints during acceleration, deceleration and steady state running. 10 runners were compared during acceleration, deceleration and steady state running using three-dimensional kinematics and kinetics measures...
October 13, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27718393/the-effects-of-fatigue-on-lower-extremity-kinematics-kinetics-and-joint-coupling-in-symptomatic-female-runners-with-iliotibial-band-syndrome
#7
Allison M Brown, Rebecca A Zifchock, Howard J Hillstrom, Jinsup Song, Carole A Tucker
BACKGROUND: Altered hip and knee kinematics and joint coupling have been documented in runners with iliotibial band syndrome. Symptoms often present themselves after several minutes of running, yet the effect of fatigue warrants further exploration. The purpose of this study was to determine the effect of a run to fatigue in runners with iliotibial band syndrome, as compared to healthy controls. METHODS: Twenty uninjured and 12 female runners with iliotibial band syndrome performed a treadmill run to fatigue...
September 30, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27699484/running-decreases-knee-intra-articular-cytokine-and-cartilage-oligomeric-matrix-concentrations-a-pilot-study
#8
Robert D Hyldahl, Alyssa Evans, Sunku Kwon, Sarah T Ridge, Eric Robinson, J Ty Hopkins, Matthew K Seeley
INTRODUCTION: Regular exercise protects against degenerative joint disorders, yet the mechanisms that underlie these benefits are poorly understood. Chronic, low-grade inflammation is widely implicated in the onset and progression of degenerative joint disease. PURPOSE: To examine the effect of running on knee intra-articular and circulating markers of inflammation and cartilage turnover in healthy men and women. METHODS: Six recreational runners completed a running (30 min) and control (unloaded for 30 min) session in a counterbalanced order...
October 3, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27616268/continuous-three-dimensional-analysis-of-running-mechanics-during-a-marathon-by-means-of-inertial-magnetic-measurement-units-to-objectify-changes-in-running-mechanics
#9
Jasper Reenalda, Erik Maartens, Lotte Homan, J H Jaap Buurke
Recent developments in wearable and wireless sensor technology allow for a continuous three dimensional analysis of running mechanics in the sport specific setting. The present study is the first to demonstrate the possibility of analyzing three dimensional (3D) running mechanics continuously, by means of inertial magnetic measurement units, to objectify changes in mechanics over the course of a marathon. Three well trained male distance runners ran a marathon while equipped with inertial magnetic measurement units on trunk, pelvis, upper legs, lower legs and feet to obtain a 3D view of running mechanics and to asses changes in running mechanics over the course of a marathon...
October 3, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27581179/effect-of-body-weight-support-running-on-lower-limb-biomechanics
#10
Michael Neal, Neil Fleming, Lindsey Eberman, Kenneth Games, Jeremiah Vaughan
Study Design Controlled laboratory study. Background Body-weight-support (BWS) running is increasing in popularity, despite limited evidence of its effects on running mechanics. Objectives To determine the effect of increasing BWS on lower-limb biomechanics during lower-body positive-pressure (LBPP) treadmill running. Methods Fourteen male recreational runners completed 15 randomized trials on an LBPP treadmill at 5 levels of BWS and 3 velocities (1-minute trials with 3-minute recovery). Knee and ankle kinematic data were recorded continuously via electrogoniometry...
September 2016: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/27574739/neuromuscular-adaptations-to-same-session-combined-endurance-and-strength-training-in-recreational-endurance-runners
#11
M Schumann, P Pelttari, K Doma, L Karavirta, K Häkkinen
This study examined neuromuscular adaptations in recreational endurance runners during 24 weeks of same-session combined endurance and strength training (E+S, n=13) vs. endurance training only (E, n=14). Endurance training was similar in the 2 groups (4-6x/week). Additional maximal and explosive strength training was performed in E+S always after incremental endurance running sessions (35-45 min, 65-85% HRmax). Maximal dynamic leg press strength remained statistically unaltered in E+S but decreased in E at week 24 (-5±5%, p=0...
August 30, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27571390/kinetic-changes-during-a-six-week-minimal-footwear-and-gait-retraining-intervention-in-runners
#12
Joe P Warne, Barry P Smyth, John O'C Fagan, Michelle E Hone, Chris Richter, Alan M Nevill, Kieran A Moran, Giles D Warrington
An evaluation of a six-week Combined minimal footwear transition and gait-retraining combination vs. gait retraining only on impact characteristics and leg stiffness. Twenty-four trained male runners were randomly assigned to either (1) Minimalist footwear transition Combined with gait-retraining over a six-week period ("Combined" group; n = 12) examined in both footwear, or (2) a gait-retraining group only with no minimalist footwear exposure ("Control"; n = 12). Participants were assessed for loading rate, impact peak, vertical, knee and ankle stiffness, and foot-strike using 3D and kinetic analysis...
August 29, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27548884/bilateral-anterior-knee-pain-in-a-high-school-cross-country-runner-an-atypical-etiology
#13
James MacDonald
Anterior knee pain is a common complaint found in distance runners, and can be the end result of a variety of benign processes. A 17-year-old female cross-country runner presented to a sports medicine clinic with insidious onset of bilateral patellofemoral pain (PFP). In the workup of the significant quadriceps weakness discovered on her initial examination, a principal contributing cause of her PFP, she was found to have a form of spinal muscular atrophy, an uncommon neurodegenerative disease that typically requires multidisciplinary medical care...
August 19, 2016: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/27519678/running-and-knee-osteoarthritis-a-systematic-review-and-meta-analysis
#14
Kate A Timmins, Richard D Leech, Mark E Batt, Kimberley L Edwards
BACKGROUND: Osteoarthritis (OA) is a chronic condition characterized by pain, impaired function, and reduced quality of life. A number of risk factors for knee OA have been identified, such as obesity, occupation, and injury. The association between knee OA and physical activity or particular sports such as running is less clear. Previous reviews, and the evidence that informs them, present contradictory or inconclusive findings. PURPOSE: This systematic review aimed to determine the association between running and the development of knee OA...
August 12, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27513169/hip-extensor-strength-trunk-posture-and-use-of-the-knee-extensor-muscles-during-running
#15
Hsiang-Ling Teng, Christopher M Powers
CONTEXT: Diminished hip-muscle performance has been proposed to contribute to various knee injuries. OBJECTIVE: To determine the association between hip-extensor muscle strength and sagittal-plane trunk posture and the relationships among hip-extensor muscle strength and hip- and knee-extensor work during running. DESIGN: Descriptive laboratory study. SETTING: Musculoskeletal biomechanical laboratory. PATIENTS OR OTHER PARTICIPANTS: A total of 40 asymptomatic recreational runners, 20 men (age = 27...
July 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27476066/intrarater-reliability-of-hand-held-dynamometry-in-measuring-lower-extremity-isometric-strength-using-a-portable-stabilization-device
#16
Steven M Jackson, M Samuel Cheng, A Russell Smith, Morey J Kolber
Hand held dynamometry (HHD) is a more objective way to quantify muscle force production (MP) compared to traditional manual muscle testing. HHD reliability can be negatively impacted by both the strength of the tester and the subject particularly in the lower extremities due to larger muscle groups. The primary aim of this investigation was to assess intrarater reliability of HHD with use of a portable stabilization device for lower extremity MP in an athletic population. Isometric lower extremity strength was measured for bilateral lower extremities including hip abductors, external rotators, adductors, knee extensors, and ankle plantar flexors was measured in a sample of healthy recreational runners (8 male, 7 females, = 30 limbs) training for a marathon...
July 21, 2016: Manual Therapy
https://www.readbyqxmd.com/read/27458895/lateral-capsular-meniscal-tear-in-a-cross-country-runner
#17
Todd P Pierce, Casey Wagner, Vincent K McInerney, Anthony Festa, Anthony J Scillia
Tears of the meniscal capsular junction present unique diagnostic and treatment challenges for practitioners because they are rich in blood supply yet often not visualized on magnetic resonance imaging. The authors report the case of a young man with a meniscal capsular junction tear, difficulties related to his diagnosis, and his short-term outcomes following surgical treatment. An 18-year-old male cross-country runner presented to the authors for nonradiating lateral right knee pain after a failed course of physical therapy...
November 1, 2016: Orthopedics
https://www.readbyqxmd.com/read/27455100/self-reported-minimalist-running-injury-incidence-and-severity-a-pilot-study
#18
Katrina Ostermann, Lance Ridpath, Jandy B Hanna
INTRODUCTION: Minimalist running entails using shoes with a flexible thin sole and is popular in the United States. Existing literature disagrees over whether minimalist running shoes (MRS) improve perceived severity of injuries associated with running in traditional running shoes (TRS). Additionally, the perceived injury patterns associated with MRS are relatively unknown. OBJECTIVES: To examine whether injury incidence and severity (ie, degree of pain) by body region change after switching to MRS, and to determine if transition times affect injury incidences or severity with MRS...
August 1, 2016: Journal of the American Osteopathic Association
https://www.readbyqxmd.com/read/27400865/the-influence-of-long-distance-running-on-sonographic-joint-and-tendon-pathology-results-from-a-prospective-study-with-marathon-runners
#19
Fabian Proft, Mathias Grunke, Christiane Reindl, Felix Mueller, Maximilian Kriegmair, Jan Leipe, Peter Weinert, Hendrik Schulze-Koops, Matthias Witt
BACKGROUND: The impact of physical exercise on joints and tendons is still a matter of debate. The aim of this study was to investigate with ultrasound the acute effects of extreme physical exercise on knee and ankle joints and their surrounding structures in trained athletes. METHODS: Participants of the Munich marathon were examined by arthrosonography before and after long distance running. Ultrasound assessment included grey scale and power Doppler examination of the knee and talocrural joints with surrounding tendons...
2016: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27373796/adding-muscle-where-you-need-it-non-uniform-hypertrophy-patterns-in-elite-sprinters
#20
G G Handsfield, K R Knaus, N M Fiorentino, C H Meyer, J M Hart, S S Blemker
Sprint runners achieve much higher gait velocities and accelerations than average humans, due in part to large forces generated by their lower limb muscles. Various factors have been explored in the past to understand sprint biomechanics, but the distribution of muscle volumes in the lower limb has not been investigated in elite sprinters. In this study, we used non-Cartesian MRI to determine muscle sizes in vivo in a group of 15 NCAA Division I sprinters. Normalizing muscle sizes by body size, we compared sprinter muscles to non-sprinter muscles, calculated Z-scores to determine non-uniformly large muscles in sprinters, assessed bilateral symmetry, and assessed gender differences in sprinters' muscles...
July 4, 2016: Scandinavian Journal of Medicine & Science in Sports
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