{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/41533"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/41533","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"The effects of moderate exercise on dietary intake, iron status, and cardiovascular endurance of 56- to 67-year-old women","abstract":"The purpose of this study was to determine the effects of moderate exercise on iron status, dietary intake and cardiovascular fitness in 56- to 67-year-old women. Women 56- to 67-years-old were randomly assigned to two groups: exercise (n=8) or non-exercise (n=9) groups. Women in the exercise group cycled on an ergometer three days/week, 30 minutes/session at 70-75% maximal heart rate for 10 consecutive weeks. At weeks 0 and 11, submaximal treadmill stress tests were obtained to determine cardiovascular fitness level. Venous blood samples were also obtained at weeks 0 and 11 to determine serum ferritin, transferrin saturation, serum iron, total iron-binding capacity, hematocrit and hemoglobin concentrations. Three-day dietary and activity records were obtained from each subject at weeks 0 and 10. Using paired t-tests for statistical analysis, the data indicated a significant increase in time to reach 70% maximum heart rate (p<0.001), a significant decrease in average heart rate/grade (p<0.05) and a significant increase in hemoglobin concentrations (p<0.01) in the exercise group at week 11. Student t-tests indicated significant differences between the groups in hemoglobin concentration at week 0 (p<0.005) and hematocrit concentration at weeks 0 and 11 (p<0.05). The exercise group had significantly lower vitamin C and monounsaturated fatty acid intake than the non-exercise group at week 0 (p<0.05). No other significant differences in nutrient intakes were observed between or within the two groups. Caloric intakes varied widely between the two groups, ranging from 1223.0 ± 248.4 to 1533.3 ± 480.8 kcal at weeks 0 and 10 in the exercise group; 1270.1 ± 376.3 to 1348.7 ± 334.8 kcal in the non-exercise group. Intakes of zinc were less than 70% of the 1989 RDA in both groups, ranging from 56.9 ± 14.6 to 66.6 ± 16.3 percent. The results indicate that moderate exercise does not significantly change the dietary intake and all parameters of iron status but enhances the cardiovascular fitness level in 56- to 67-year-old women.","abstract_html":"The purpose of this study was to determine the effects of moderate exercise on iron status, dietary intake and cardiovascular fitness in 56- to 67-year-old women. Women 56- to 67-years-old were randomly assigned to two groups: exercise (n=8) or non-exercise (n=9) groups. Women in the exercise group cycled on an ergometer three days/week, 30 minutes/session at 70-75% maximal heart rate for 10 consecutive weeks. At weeks 0 and 11, submaximal treadmill stress tests were obtained to determine cardiovascular fitness level. Venous blood samples were also obtained at weeks 0 and 11 to determine serum ferritin, transferrin saturation, serum iron, total iron-binding capacity, hematocrit and hemoglobin concentrations. Three-day dietary and activity records were obtained from each subject at weeks 0 and 10. Using paired t-tests for statistical analysis, the data indicated a significant increase in time to reach 70% maximum heart rate (p&lt;0.001), a significant decrease in average heart rate/grade (p&lt;0.05) and a significant increase in hemoglobin concentrations (p&lt;0.01) in the exercise group at week 11. Student t-tests indicated significant differences between the groups in hemoglobin concentration at week 0 (p&lt;0.005) and hematocrit concentration at weeks 0 and 11 (p&lt;0.05). The exercise group had significantly lower vitamin C and monounsaturated fatty acid intake than the non-exercise group at week 0 (p&lt;0.05). No other significant differences in nutrient intakes were observed between or within the two groups. Caloric intakes varied widely between the two groups, ranging from 1223.0 ± 248.4 to 1533.3 ± 480.8 kcal at weeks 0 and 10 in the exercise group; 1270.1 ± 376.3 to 1348.7 ± 334.8 kcal in the non-exercise group. Intakes of zinc were less than 70% of the 1989 RDA in both groups, ranging from 56.9 ± 14.6 to 66.6 ± 16.3 percent. The results indicate that moderate exercise does not significantly change the dietary intake and all parameters of iron status but enhances the cardiovascular fitness level in 56- to 67-year-old women.","abstract_has_math":false,"creators":["Woo, Violet Ryo-Hwa"],"institution":"Virginia Tech","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Human Nutrition and Foods","degree_department":"Human Nutrition and Foods","school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1990,"date_issued":"1990","date_published":"1990","updated_at":"2026-07-22T22:20:23Z","subjects":[],"languages":["en"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-03122009-041905"],"render_values":[{"text":"etd-03122009-041905","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10919/41533","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.department","label":"Department","values":["Human Nutrition and Foods"]},{"key":"dc:creator","label":"Author","values":["Woo, Violet Ryo-Hwa"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2014-03-14T21:31:28Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2014-03-14T21:31:28Z","2009-03-12"]},{"key":"dc:date.issued","label":"Date","values":["1990"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Tech"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Human Nutrition and Foods"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-03122009-041905"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/41533"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The purpose of this study was to determine the effects of moderate exercise on iron status, dietary intake and cardiovascular fitness in 56- to 67-year-old women. Women 56- to 67-years-old were randomly assigned to two groups: exercise (n=8) or non-exercise (n=9) groups. Women in the exercise group cycled on an ergometer three days/week, 30 minutes/session at 70-75% maximal heart rate for 10 consecutive weeks. At weeks 0 and 11, submaximal treadmill stress tests were obtained to determine cardiovascular fitness level. Venous blood samples were also obtained at weeks 0 and 11 to determine serum ferritin, transferrin saturation, serum iron, total iron-binding capacity, hematocrit and hemoglobin concentrations. Three-day dietary and activity records were obtained from each subject at weeks 0 and 10. Using paired t-tests for statistical analysis, the data indicated a significant increase in time to reach 70% maximum heart rate (p<0.001), a significant decrease in average heart rate/grade (p<0.05) and a significant increase in hemoglobin concentrations (p<0.01) in the exercise group at week 11. Student t-tests indicated significant differences between the groups in hemoglobin concentration at week 0 (p<0.005) and hematocrit concentration at weeks 0 and 11 (p<0.05). The exercise group had significantly lower vitamin C and monounsaturated fatty acid intake than the non-exercise group at week 0 (p<0.05). No other significant differences in nutrient intakes were observed between or within the two groups. Caloric intakes varied widely between the two groups, ranging from 1223.0 ± 248.4 to 1533.3 ± 480.8 kcal at weeks 0 and 10 in the exercise group; 1270.1 ± 376.3 to 1348.7 ± 334.8 kcal in the non-exercise group. Intakes of zinc were less than 70% of the 1989 RDA in both groups, ranging from 56.9 ± 14.6 to 66.6 ± 16.3 percent. The results indicate that moderate exercise does not significantly change the dietary intake and all parameters of iron status but enhances the cardiovascular fitness level in 56- to 67-year-old women."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["BTD"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["The effects of moderate exercise on dietary intake, iron status, and cardiovascular endurance of 56- to 67-year-old women"]}]}],"canonical_facts":{"dc:contributor.department":["Human Nutrition and Foods"],"dc:creator":["Woo, Violet Ryo-Hwa"],"dc:date.accessioned":["2014-03-14T21:31:28Z"],"dc:date.available":["2014-03-14T21:31:28Z","2009-03-12"],"dc:date.issued":["1990"],"dc:description.abstract":["The purpose of this study was to determine the effects of moderate exercise on iron status, dietary intake and cardiovascular fitness in 56- to 67-year-old women. Women 56- to 67-years-old were randomly assigned to two groups: exercise (n=8) or non-exercise (n=9) groups. Women in the exercise group cycled on an ergometer three days/week, 30 minutes/session at 70-75% maximal heart rate for 10 consecutive weeks. At weeks 0 and 11, submaximal treadmill stress tests were obtained to determine cardiovascular fitness level. Venous blood samples were also obtained at weeks 0 and 11 to determine serum ferritin, transferrin saturation, serum iron, total iron-binding capacity, hematocrit and hemoglobin concentrations. Three-day dietary and activity records were obtained from each subject at weeks 0 and 10. Using paired t-tests for statistical analysis, the data indicated a significant increase in time to reach 70% maximum heart rate (p<0.001), a significant decrease in average heart rate/grade (p<0.05) and a significant increase in hemoglobin concentrations (p<0.01) in the exercise group at week 11. Student t-tests indicated significant differences between the groups in hemoglobin concentration at week 0 (p<0.005) and hematocrit concentration at weeks 0 and 11 (p<0.05). The exercise group had significantly lower vitamin C and monounsaturated fatty acid intake than the non-exercise group at week 0 (p<0.05). No other significant differences in nutrient intakes were observed between or within the two groups. Caloric intakes varied widely between the two groups, ranging from 1223.0 ± 248.4 to 1533.3 ± 480.8 kcal at weeks 0 and 10 in the exercise group; 1270.1 ± 376.3 to 1348.7 ± 334.8 kcal in the non-exercise group. Intakes of zinc were less than 70% of the 1989 RDA in both groups, ranging from 56.9 ± 14.6 to 66.6 ± 16.3 percent. The results indicate that moderate exercise does not significantly change the dietary intake and all parameters of iron status but enhances the cardiovascular fitness level in 56- to 67-year-old women."],"dc:description.degree":["Master of Science"],"dc:format.medium":["BTD"],"dc:format.mimetype":["application/pdf"],"dc:identifier.other":["etd-03122009-041905"],"dc:identifier.uri":["http://hdl.handle.net/10919/41533"],"dc:language.iso":["en"],"dc:publisher":["Virginia Tech"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["The effects of moderate exercise on dietary intake, iron status, and cardiovascular endurance of 56- to 67-year-old women"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Human Nutrition and Foods"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Polytechnic Institute and State University"]},"updated_at":"2026-07-22T22:20:23Z"}