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Effect of shoe cushioning on the development of reticulocytosis in distance runners... footstrike hemolysis.

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Title: Effect of shoe cushioning on the development of reticulocytosis in distance runners... footstrike hemolysis.
Authors: Dressendorfer RH (AUTHOR), Wade CE (AUTHOR), Frederick EC (AUTHOR)
Source: American Journal of Sports Medicine. Mar/Apr92, Vol. 20 Issue 2, p212-216. 5p.
Subject Terms: *Evaluation research, Diagnosis of blood diseases, Shoes, Running, Reticulocytes, Sports injuries
Abstract: We studied erythropoietic activity in relation to the rearfoot cushioning of shoes worn by 14 male runners before, during, and the morning after a 17-day period of increased training mileage. The percentage of reticulocytes in the red blood cell count (normal, < 0.8%) served as the marker for erythropoietic activity. Each runner was assigned to either a firm-sole group (7) or a soft-sole group (7) according to the heel impact attenuation character (Peak g) of his shoes. Peak g was 18% greater in the firm-sole group (P < 0.001). Otherwise, the groups were similar in physical characteristics, training mileage, and running ability. All subjects ran a total of 430 km, a distance that averaged 79% higher than their regular training distance for a 17-day period. Resting blood samples were obtained at baseline and on three mornings (Days 11, 13, and Day 18, which followed the completion of the increased training period). No significant differences were found between the groups in red blood cell count, hematocrit, or total hemoglobin, haptoglobin, plasma-free hemoglobin, and serum ferritin levels. The groups did not differ in percent reticulocytes at baseline (0.2% firm-sole versus 0.2% soft-sole), on Day 11 after running 280 km (0.8% firm-sole versus 0.8% soft-sole), or on Day 13 after 48 hours of rest (1.3% firm-sole versus 1.0% soft-sole). However, in Day 18 after running 430 km, reticulocyte counts were 29% higher (P < 0.05) in firm-sole than soft-sole (2.2% versus 1.7%, respectively). The overall change in percent reticulocytes was linearly correlated with Peak g (r = 0.57, P < 0.05). Although marked reticulocytosis occurred in both groups, it was significantly more pronounced in the firm-sole group. The positive correlation between percent reticulocytes and Peak g suggests that shoe rear-foot cushioning is one determinant of the erythropoietic response to increased training mileage in distance runners. [ABSTRACT FROM AUTHOR]
Copyright of American Journal of Sports Medicine is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Education Research Complete
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DbLabel: Education Research Complete
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PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Effect of shoe cushioning on the development of reticulocytosis in distance runners... footstrike hemolysis.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Dressendorfer+RH%22&quot;&gt;Dressendorfer RH&lt;/searchLink&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Wade+CE%22&quot;&gt;Wade CE&lt;/searchLink&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Frederick+EC%22&quot;&gt;Frederick EC&lt;/searchLink&gt; (AUTHOR)
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22American+Journal+of+Sports+Medicine%22&quot;&gt;American Journal of Sports Medicine&lt;/searchLink&gt;. Mar/Apr92, Vol. 20 Issue 2, p212-216. 5p.
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  Data: *&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Evaluation+research%22&quot;&gt;Evaluation research&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Diagnosis+of+blood+diseases%22&quot;&gt;Diagnosis of blood diseases&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Shoes%22&quot;&gt;Shoes&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Running%22&quot;&gt;Running&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Reticulocytes%22&quot;&gt;Reticulocytes&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Sports+injuries%22&quot;&gt;Sports injuries&lt;/searchLink&gt;
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  Label: Abstract
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  Data: We studied erythropoietic activity in relation to the rearfoot cushioning of shoes worn by 14 male runners before, during, and the morning after a 17-day period of increased training mileage. The percentage of reticulocytes in the red blood cell count (normal, &lt; 0.8%) served as the marker for erythropoietic activity. Each runner was assigned to either a firm-sole group (7) or a soft-sole group (7) according to the heel impact attenuation character (Peak g) of his shoes. Peak g was 18% greater in the firm-sole group (P &lt; 0.001). Otherwise, the groups were similar in physical characteristics, training mileage, and running ability. All subjects ran a total of 430 km, a distance that averaged 79% higher than their regular training distance for a 17-day period. Resting blood samples were obtained at baseline and on three mornings (Days 11, 13, and Day 18, which followed the completion of the increased training period). No significant differences were found between the groups in red blood cell count, hematocrit, or total hemoglobin, haptoglobin, plasma-free hemoglobin, and serum ferritin levels. The groups did not differ in percent reticulocytes at baseline (0.2% firm-sole versus 0.2% soft-sole), on Day 11 after running 280 km (0.8% firm-sole versus 0.8% soft-sole), or on Day 13 after 48 hours of rest (1.3% firm-sole versus 1.0% soft-sole). However, in Day 18 after running 430 km, reticulocyte counts were 29% higher (P &lt; 0.05) in firm-sole than soft-sole (2.2% versus 1.7%, respectively). The overall change in percent reticulocytes was linearly correlated with Peak g (r = 0.57, P &lt; 0.05). Although marked reticulocytosis occurred in both groups, it was significantly more pronounced in the firm-sole group. The positive correlation between percent reticulocytes and Peak g suggests that shoe rear-foot cushioning is one determinant of the erythropoietic response to increased training mileage in distance runners. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: &lt;i&gt;Copyright of American Journal of Sports Medicine is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1177/036354659202000221
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      – Code: eng
        Text: English
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        PageCount: 5
        StartPage: 212
    Subjects:
      – SubjectFull: Evaluation research
        Type: general
      – SubjectFull: Diagnosis of blood diseases
        Type: general
      – SubjectFull: Shoes
        Type: general
      – SubjectFull: Running
        Type: general
      – SubjectFull: Reticulocytes
        Type: general
      – SubjectFull: Sports injuries
        Type: general
    Titles:
      – TitleFull: Effect of shoe cushioning on the development of reticulocytosis in distance runners... footstrike hemolysis.
        Type: main
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            NameFull: Dressendorfer RH
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            NameFull: Wade CE
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            NameFull: Frederick EC
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              M: 03
              Text: Mar/Apr92
              Type: published
              Y: 1992
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            – TitleFull: American Journal of Sports Medicine
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