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Post‐exercise meal timing does not influence hemoglobin synthesis in iron deficient rats
Author(s) -
Fujii Takako,
Nakashima Ayumi,
Xu Minjun,
Sonou Tomohiro,
Matsuo Tatsuhiro,
Okamura Koji
Publication year - 2013
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.27.1_supplement.634.10
Subject(s) - meal , medicine , endocrinology , hemoglobin , muscle hypertrophy , skeletal muscle , anemia , chemistry
Resistance exercise increases heme synthesis in the bone marrow and the hemoglobin (Hb) concentration in iron‐deficient rats. Post‐exercise early nutrient provision facilitated exercise‐induced skeletal muscle protein hypertrophy compared to late provision in a rat study conducted for 8 weeks. However, ingesting meals early after exercise did not increase the Hb concentration in a 3‐week study using iron‐deficient rats (Fujii, T., et al. EB2012). There is a possibility that the latter study period might be too short, as no significant muscle hypertrophy was observed. Therefore, in this study, the study period was prolonged to 8 weeks to investigate the effect of post‐exercise meal timing on the Hb concentration and other blood parameters in iron‐deficient rats. Male 4‐week‐old rats were fed an iron‐deficient diet (12 mg iron/kg) and performed climbing exercise (3 d/w) for 8 weeks. The rats were divided into a group fed a post‐exercise meal early after exercise (E) or a group fed the meal 4 h after exercise (L). The skeletal muscle weights were significantly higher in the E group than in the L group. However, the Hb concentration did not differ between the groups. In addition, the bone marrow ALAD activity and plasma iron concentration did not differ. Therefore, post‐exercise meal timing that enhances exercise‐induced muscle hypertrophy has no effect on either the biosynthesis or concentration of Hb.