Abstract:
PURPOSE:High internal stress is considered to be a possible cause of heel-pad problems. External biomechanical measurements are used to attempt to understand the causes of heel pain. However, internal stress cannot be measured experimentally. Therefore, the purpose of this study was to quantify the relationship between magnitude of force, time to peak force, and sole angle with internal stresses in the heel using a finite element model. METHODS:Computer tomography (CT) was used to create a nonlinear time-dependent three-dimensional finite element model of the heel pad. The material model was based on previously reported force-displacement data derived from in vitro experiments. Although it was not possible to compare internal calculations of stress with experimental data, good agreement was found for external plantar pressures and strains when compared with in vivo values. Internal stresses and external plantar pressures were then investigated for different forces, loading rates (i.e., time to peak force), and angles of foot inclination in the sagittal plane (i.e., sole angle). RESULTS:The results of the model indicate that compressive stress is localized in the region inferior to the calcaneal tuberosity. Peak internal compressive stress was greater than external plantar pressure. Increasing the loading rate (i.e., reducing the time to peak force) caused plantar pressure to increase to a greater extent than internal stress. The general levels of stress were higher when the heel was loaded in an inclined position (i.e., greater sole angle). CONCLUSION:The finite element technique provides a useful step in bridging the gap between external measures and internal mechanics of the heel pad. A combined kinematic, kinetic, and modeling approach may be required when attempting to identify the biomechanical source of heel pain.
journal_name
Med Sci Sports Exercjournal_title
Medicine and science in sports and exerciseauthors
Spears IR,Miller-Young JE,Waters M,Rome Ksubject
Has Abstractpub_date
2005-06-01 00:00:00pages
1030-6issue
6eissn
0195-9131issn
1530-0315pii
00005768-200506000-00019journal_volume
37pub_type
杂志文章abstract:INTRODUCTION:The effects of glargine/glulisine insulin regimen on exercise blood glucose (BG) and strategies to limit exercise-induced hypoglycemia are not well documented. Intermittent high-intensity exercise has been proposed to prevent hypoglycemia, but its effect in participants with type 1 diabetes using glargine/...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,随机对照试验
doi:10.1249/MSS.0b013e31826c6ad3
更新日期:2013-01-01 00:00:00
abstract:PURPOSE:To assess the validity of the new Actical accelerometer step count function. METHODS:Actical step counts were compared according to two criterion standards. 1) Eight Acticals were assessed using a mechanical shaker table under six different testing conditions. 2) Thirty-eight volunteers (aged 9-59 yr) wore eig...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/mss.0b013e3804ec4e9
更新日期:2007-07-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,随机对照试验
doi:10.1249/MSS.0b013e3181bf94d6
更新日期:2010-04-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000183848.25845.e0
更新日期:2006-02-01 00:00:00
abstract::The assumption that lower extremity function is bilaterally symmetrical is prevalent throughout the biomechanics literature. The unilateral development of many overuse and acute injuries may suggest that this assumption is inaccurate. Analyses of bilateral function report conflicting results and may be partially attri...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1994-09-01 00:00:00
abstract::Estimates of muscular efficiency in competitive and recreational cyclists at similar work intensities and cycling frequencies were examined. Twelve healthy college-age male nonsmoker volunteers were grouped as either competitive (CC; N = 6) or recreational (RC; N = 6) cyclists based upon previous cycling experience. S...
journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章
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更新日期:1996-11-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200009001-00009
更新日期:2000-09-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200211000-00001
更新日期:2002-11-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,随机对照试验
doi:10.1249/MSS.0b013e31823cef5e
更新日期:2012-05-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000001774
更新日期:2019-02-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200203000-00012
更新日期:2002-03-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200101000-00008
更新日期:2001-01-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000001495
更新日期:2018-04-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000002388
更新日期:2020-11-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 共识发展会议,杂志文章
doi:10.1249/MSS.0b013e31818acdcb
更新日期:2008-11-01 00:00:00
abstract::Laboratory studies using direct calorimetry, a technique which is no longer either rare or difficult, have shown no essential differences between men and women who gain weight easily and the always lean. Both groups gained weight similarly when overeating by 1,000 kcal X d-1. Thermogenic responses to eating and the en...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1986-02-01 00:00:00
abstract:INTRODUCTION:Acute bupropion (dopamine/noradrenaline reuptake inhibitor) administration significantly improved time trial performance and increased core temperature in the heat (30 degrees C). PURPOSE:The present study was performed to examine the effect of a dopaminergic reuptake inhibitor on exercise capacity and th...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,随机对照试验
doi:10.1249/MSS.0b013e3181659c4d
更新日期:2008-05-01 00:00:00
abstract:PURPOSE:Previous studies have suggested that higher levels of physical activity may lower lung cancer risk; however, few prospective studies have evaluated lung cancer mortality in relation to cardiorespiratory fitness (CRF), an objective marker of recent physical activity habits. METHODS:Thirty-eight thousand men, ag...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0b013e3181c47b65
更新日期:2010-05-01 00:00:00
abstract:PURPOSE:The prevalence of allergy and asthma symptoms and asthma medication use, which has been extensively studied in elite athletes, has received little attention in recreational roadrunners. METHODS:A validated questionnaire was used to determine the prevalence of allergy and asthma symptoms, the use of medication,...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000235357.31932.43
更新日期:2006-12-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/MSS.0000000000002259
更新日期:2020-06-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200011000-00013
更新日期:2000-11-01 00:00:00
abstract::Perceptual and physiological congruity was examined during recovery from high-intensity dynamic exercise. Nine males (24.8 +/- 0.6 yr; VO2max; 52.3 +/- 1.5 ml.kg-1.min-1) undertook in random order four maximal treadmill protocols. Treadmill speed was held constant (5.3 km.h-1) while grade was incremented by 2, 4, 6, o...
journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章,随机对照试验
doi:
更新日期:1992-03-01 00:00:00
abstract::The prevalence of the sickle cell trait in a school for elite young athletes in Cameroon, West Africa, was examined in order to evaluate whether the choice of an athletic career was influenced by its presence. The presence of hemoglobin AS was found in 27 of the 145 students attending the school (18.6%). Since the fre...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1991-03-01 00:00:00
abstract:INTRODUCTION:A nonlinear dynamic systems model has previously been proposed to explain pacing strategies employed during exercise. PURPOSE:This study was conducted to examine the pacing strategies used under varying conditions during the cycle phase of an Ironman triathlon. METHODS:The bicycles of six well-trained ma...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/01.mss.0000210202.33070.55
更新日期:2006-04-01 00:00:00
abstract:UNLABELLED:Skeletal muscle injury is major concern in sport- and occupation-related fields. PURPOSE:We investigated the effects of increasing stretch-shortening contraction (SSC) repetition number in vivo and the resulting changes in functional performance and quantitative morphometry in rat skeletal muscle. METHODS:...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/mss.0b013e3180686dc7
更新日期:2007-08-01 00:00:00
abstract::Ten pairs of monozygotic twins of both sexes were submitted to a 20-wk endurance-training program, four and five times per week, 40 min per session, at an average of 80% of the maximal heart rate reserve. Testing and training were performed on cycle ergometers. Maximal aerobic power (MAP in ml O2 X min-1 X kg-1) and v...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/00005768-198410000-00012
更新日期:1984-10-01 00:00:00
abstract:PURPOSE:Past investigations indicate that training-related injuries are associated with certain performance-oriented measures of physical fitness and certain lifestyle characteristics. This study examined associations between injuries, direct (physiological) measures of physical fitness, and lifestyle characteristics. ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-200106000-00014
更新日期:2001-06-01 00:00:00
abstract:PURPOSE:To evaluate the effects of physical activity on bone mineral density, bone mineral content, and lean mass in postmenopausal, overweight/obese women. METHODS:We conducted a 12-month randomized controlled aerobic exercise intervention versus control in 173 sedentary, overweight/obese, postmenopausal women, aged ...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,随机对照试验
doi:10.1249/01.mss.0000227308.11278.d7
更新日期:2006-07-01 00:00:00
abstract::The purpose of this study was to determine whether competitive and recreational runners would replicate land training intensity during water immersion (WI) running with (V) and without (NV) a flotation vest and during treadmill running (Tm). Seven female competitive runners (CR) and seven female noncompetitive runners...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1097/00005768-199710000-00015
更新日期:1997-10-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2000-02-01 00:00:00