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PubMed1992

[Shoe supports and corrective shoes in performance athletes--a 3-year study in young cross-country skiers].

51 young cross-country skiers, members of the Swiss national team, were interrogated and examined relative to problems of the skeleton. In case of 36 athletes (71%), orthopedic corrections of the foot and leg position were effectuated. The annual controls showed a reduction of pain and decreased impairment of the capacity of sport from 62.7% to 21.9%. The painful inflammations decreased over the same period from 66.7% to 32%. In comparison with other epidemiologic studies without treatment, we can conclude that orthopedic corrections are efficient in the protection of high-performance athletes from overload lesions and probably from definitive lesions.

Adolescent↗
PubMed2005

Stature and sex estimate using foot and shoe dimensions.

The aim of the study was to develop a formula to estimate the stature and sex of an individual using foot and shoe dimensions. To this aim the stature, right and left shoe sizes, and maximum and minimum feet length and width measurements of a target group of 569 individuals were taken. The group was composed of 294 males and 275 females. The highest correlation coefficient was found in length measurements. A notable difference between males and females existed with regard to both right and left foot and shoe length and width averages and shoe sizes (p < 0.001). Among the group, a significant correlation was found in regard to stature and right shoe length (r = 0.591, p < 0.001), with the correlation between stature and right foot length and stature and right shoe length being 0.579 (p < 0.001); as for the female group, there was a significant correlation between stature and right foot length and stature and right shoe length (r = 0.460, p < 0.001). Thus the regression formula obtained are as follows: for the right side: sex = 69.169 + 0.173 (maximum foot length) - 0.368 (maximum foot width) - 0.820 (shoe length) + 0.224 (shoe width) - 1.280 (shoe number). For the left side: sex = 69.551 + 0.276 (maximum foot length) - 0.504 (maximum foot width) - 0.739 (shoe length) + 0.344 (shoe width) - 1.360 (shoe number). In application of the formula, if sex is lower than 0.50, the shoe belongs to a male, if higher, then to female. The formula which was obtained in regression analysis in order to estimate the stature when the measurements of shoe and foot were known. For the right side, stature = 47.93 + 1.083 (maximum foot length) + 0.788 (shoe length) 1.813 (shoe number) (SEE:31.410). For the left side: stature = 47.33 + 1.139 (maximum foot length) + 0.593 (shoe length) x 1.924 (shoe number) (SEE:31.607). It was understood that foot and shoe sizes are a criteria to estimate the stature of a person that there was a strong relationship between foot and shoe length and width and that these can be used to aid estimation. It was found that in sex estimate, foot and shoe lengths are better in helping the estimate than width measurements, and that the use of shoe measurements rather than bare foot measurements are better to obtain meaningful results.

Adult↗
PubMed1995

Influence of the running shoe sole on the pressure in the anterior tibial compartment.

The objective of the study was to evaluate the influence of a negative shoe sole on the intracompartmental pressure in the anterior tibial compartment. In 35 volunteers, the compartment pressure was documented during a 20-min. run on a treadmill with conventional running shoes and with running shoes with a negative sole. Besides the documentation of the compartment pressure we also performed a gait analysis. The comparison of gait cycle between the conventional shoe and the shoe with a negative sole showed remarkable differences. With the conventional shoe, plantar flexion after initial contact was 16 degrees compared to 6 degrees with the special shoe. Duration of plantar flexion with the normal shoe was 0.17 sec. compared to 0.1 sec. with the special shoe. The intraindividual comparison of the individual pressure curves revealed evident differences in most of the subjects. The comparison of maximum pressures of each volunteer after running with the normal shoe as well as with the special shoe showed a decrease in the maximum pressure level when using the special shoe. The maximum pressures with the normal shoe (59.7 +/- 9.1 mm Hg) were significantly higher than with the special shoe (36.5 +/- 11.8 mm Hg) (p < 0.001). The comparison of the mean pressure showed similar results. With the normal shoe a mean pressure of 47.1 mm Hg (+/- 9.0 mm Hg) was measured compared to 29.8 mm Hg (+/- 11.0 mm Hg) with the special shoe (p < 0.001). Regarding the subjective comfort of the special shoe 18 subjects did not find any difference in comparison with the normal shoe.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1996

Postmortem evaluation of homotypic variation in shoe characteristics of 201 thoroughbred racehorses.

OBJECTIVES: To develop a standard technique for evaluation of racehorse shoes, to assess homotypic variation (interlimb variation) in shoe characteristics, and to determine whether shoe characteristics varied with age and sex. DESIGN: Cross-sectional study. ANIMALS: Thoroughbred racehorses (n = 201) that died or were euthanatized at California racetracks between August 1992 and July 1994. PROCEDURE: Shoe characteristics were measured on horses examined after death. Percentage of agreement was used to compare shoe characteristics between limbs (homotypic variation). Using chi 2 analysis, shoe characteristics were compared between horses grouped by age and sex. RESULTS: Toe grabs were present on 90.5% of horses, and rim shoes were present on 15.9% of horses. Heel traction devices were less frequent on front (2.5%) than rear (6%) hooves. Pads were present on 24.9% of horses, with bonded rim pads most common. Special types of shoes were present cn 5% of horses. Percentage of agreement between left and right front hooves and between left and right rear hooves was high (20/25 variables; % agreement > or = 99). In contrast, percentage of agreement between left front and left rear hooves and between right front and right rear hooves was low (2/25 variables; % agreement > or = 99). Presence of a pad was significantly (P < 0.05) associated with age, and several shoe variable (size, presence of a special shoe, overall wear matched) were significantly (P < 0.05) associated with sex. CLINICAL RELEVANCE: Except for variables related to special shoes, wear, and weight, 1 shoe for the respective fore- or hind limbs could be used as an indicator for the contralateral shoe worn by Thoroughbred racehorses without substantial loss of information. However, 1 shoe could not be used as an indicator for shoe characteristics of all 4 limbs. Some shoe characteristics are associated with age and sex, and these variables should be considered possible confounders in studies of shoe characteristics.

Animals↗
PubMed2002

The effect of shoe wedges and lifts on symmetry of stance and weight bearing in hemiparetic individuals.

OBJECTIVE: To determine the effect of shoe wedges and lifts on symmetry of stance and weight bearing in hemiparetic individuals. DESIGN: Weight bearing on the paretic side was measured in patients with hemiparesis during quiet standing and in conditions of compelled weight shift. SETTING: Free-standing acute inpatient rehabilitation hospital. PARTICIPANTS: Nine individuals with hemiparesis as a result of unilateral stroke who were able to stand for 3 to 5 minutes without assistance or rest, and satisfied other inclusion criteria. INTERVENTIONS: Compelled shift of the body weight was induced with different shoe wedges (5 degrees, 7.5 degrees, 12.5 degrees) or shoe lifts (0.6, 0.9, 1.2cm), which extended under the entire shoe of the unaffected limb. Weight-bearing symmetry scores were used to characterize the symmetry of stance. MAIN OUTCOME MEASURES: Weight-bearing symmetry scores. RESULTS: Without a shoe wedge or a shoe lift, weight-bearing symmetry was characterized by underloading of the paretic limb (39.90% +/-.80% of body weight). Weight shift induced by shoe wedges or shoe lifts applied to the unaffected limb promoted improved symmetry of weight bearing and stance. A shoe wedge of 5 degrees provided the most symmetrical weight distribution (51.44% +/- 1.88% of body weight). CONCLUSION: Shoe wedges and shoe lifts under the unaffected limb induced compelled weight shift toward the paretic limb, resulting in improved symmetry of stance of individuals with mild hemiparesis. We suggest that improved symmetry of bipedal standing obtained with a shoe wedge or a shoe lift applied to the unaffected limb can help overcome the learned disuse of the affected limb. We further suggest that weight distribution induced by shoe wedges or shoe lifts may help in the treatment of ambulatory hemiparetic individuals with asymmetrical stance caused by unilateral stroke.

Adult↗
PubMedDate not supplied

Differences in friction and torsional resistance in athletic shoe-turf surface interfaces.

This study evaluated the shoe-surface interaction of 15 football shoes made by 3 manufacturers in both anterior translation and rotation using a specially designed pneumatic testing system. The shoes included traditional cleated football shoes, "court" shoes (basketball-style shoes), molded-cleat shoes, and turf shoes. Under an 11.35-kg (25-pound) axial load, all shoes were tested on synthetic turf under wet and dry conditions and on natural stadium grass. Test-retest reliability, as calculated using the Pearson Product-Moment Correlation test, was 0.85 for force of translation and 0.55 for the moment of rotation. The wet versus dry surface values on translation were significantly different for rotation about the tibial axis. Spatting, which is protective taping of the ankle and heel applied on the outside of the shoe, resulted in a reduction of forces generated in both translation and rotation. No overall difference between shoes on grass versus AstroTurf was noted. However, there were significant differences for cleated and turf shoes. Shoes tested in conditions for which they were not designed exhibited reproducible excessive or extreme minimal friction characteristics that may have safety implications. On the basis of this study, we urge shoe manufacturers to display suggested indications and playing surface conditions for which their shoes are recommended.

Equipment Design↗
PubMed2000

Walking at moderate speed with heel-less shoes increases calf blood flow.

This study was designed to examine the physiological and biochemical effects of wearing heel-less shoes over a wide range of walking speeds. Six male students wearing alternately regular shoes and heel-less shoes walked at the constant speeds of 60, 80, 100 and 120 m/min for 10 min on a treadmill at 0% grade. The average heart rate was higher during heel-less shoe trials than when subjects walked in regular shoes at each speed, but differences were not significant. The calf blood flow showed its highest mean value at 80 m/min when subjects walked in heel-less shoes, and at 100 m/min when they walked in regular shoes. However, at walking speeds higher than these, calf blood flow decreased for wearers of both types of shoes. The calf blood flow after 80 m/min was higher when walking in heel-less rather than regular shoes. Blood lactate concentration after walking in heel-less shoes at 120 m/min was significantly higher than basal level, but after walking in regular shoes it was unchanged from the level before walking. Noradrenaline concentration at 120 m/min while walking in heel-less shoes was significantly higher than while walking in regular shoes. In conclusion, walking exercise in heel-less shoes induced an increase of the calf blood flow at a moderate speed, and increased glycogen metabolism and noradrenaline secretion at a faster speed.

Adult↗
PubMed2000

The effect of comments about shoe construction on impact forces during walking.

UNLABELLED: Comparisons of ground reaction forces (GRF) during gait are not typically conducted with blinding of the varied shoe characteristic, raising concerns related to the existence of a placebo effect, or a subject response based on a perceived expectation of change. PURPOSE: To determine whether investigator comments on shoe construction influenced GRF measures and ratings of shoe cushioning during walking. METHODS: 19 female college students volunteered for a study presented as a test of a new shoe material. The study involved walking (2.5 m x s(-1)) under three shoe conditions (SC). Shoes in SC2 and SC3 were harder than those in SC1, but shoes in SC1 and SC3 looked similar. Subjects in a mislead group (N = 9) were told SC1 and SC3 were baseline measures in a standard shoe, with SC2 misleadingly described as a shoe constructed of unique new material. A control group performed the same three conditions without investigator description. GRF data were collected for 10 trials for each subject in each condition, and subjects rated the perceived cushioning of each shoe. GRF data and perceived cushioning scores were analyzed using mixed-factor (group by shoe) ANOVA. RESULTS: A significant shoe main effect was found for loading rate. Post hoc tests identified the difference between SC1 and both SC2 and SC3. The group main effect was not significant for any dependent variable. CONCLUSIONS: Results suggest that, as a group, GRF data and cushioning scores are not affected by investigator comments that do not match shoe construction characteristics. However, ratings of perceived shoe cushioning by some individual subjects reflected investigator comments and not the vertical GRF variables.

Adolescent↗