Effects of a Fixed Dietary Intake on Changes in Red Blood Cell Delta-Aminolevulinate Dehydratase Activity and Hemolysis in Female Rhythmic Gymnasts: A Two-Year Follow-Up Study ▀

Ishizaki, Sakuko; Koshimizu, Taka‐aki; Yanagisawa, Kae; Akiyama, Yoshitake; Mekada, Yuko; Shiozawa, Nobuyoshi; Takahashi, Noriko; Yamakawa, Jun; Kawano, Yukari

doi:10.1123/ijsnem.16.6.597

Cited by 11 publications

(11 citation statements)

References 24 publications

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“…Ishizaki et al . suggested that 4-week dietary intervention of 15 mg of iron a day increased the activity of δ-ALAD, an enzyme participating in red blood cells (RBC) turnover; however, this intervention did not increase any other haematological indices [ 14 ]. The dosage of dietary iron supplementation in the present study (mean of 7 mg/day from Teff bread, total intake of 18.5 mg Fe/day) is similar to the total dietary treatment of 15 mg/day by Ishizaki et al .…”

Section: Discussionmentioning

confidence: 99%

“…The authors reported no differences in iron status or performance scores between iron-rich diet and free choice diet participants. However, a four weeks iron-rich diet, which provided 18.2 mg/d, showed significant effects on serum ferritin concentration in rhythmic gymnasts [ 14 ]. Another study reported that a diet rich in iron (11.8 mg iron/day) was more effective in protecting iron status than were the supplements (50 mg ferrous sulphate/day) during 12 weeks of aerobic tests in previous sedentary women [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Dietary iron intervention using a staple food product for improvement of iron status in female runners

Alaunyte

Stojceska

Plunkett

et al. 2014

Journal of the International Society of Sports Nutrition

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BackgroundAdequate nutrient intake is critically important for achieving optimal sports performance. Like all athletes, female runners require a nutritionally balanced diet to maintain daily activities and a successful training regime. This study investigates the effects of cereal product based dietary iron intervention on iron status of recreational female runners (n = 11; 32 ± 7yr; 239 ± 153 minutes exercise/week, of which 161 ± 150 minutes running activity/week; VO2max 38 ± 4 ml/kg/min).MethodsParticipants completed a 6-week dietary intervention study. They were asked to replace their usual bread with iron-rich Teff bread as part of their daily diet. During this period, their dietary habits were assessed by multiple pass 24-hr recalls; iron status was determined by venous blood analysis for serum transferrin, serum transferrin receptor, serum ferritin, total iron-binding capacity and transferrin receptor/ferritin log index.ResultsPre-intervention a cohort of 11 female runners reported inadequate daily dietary iron intake of 10.7 ± 2.7 mg/day, which was associated with overall compromised iron status. Over a third of all participants showed depleted bodily iron stores (serum ferritin <12 μg/L). Pre-intervention macronutrient assessment revealed adequate energy, protein and fibre intakes, whilst total fat and saturated fat intake was above the recommendations at the expense of carbohydrate intake. A 6-week dietary intervention resulted in significantly higher total iron intakes (18.5 mg/day, P < 0.05) and improved iron tissue supply but not enlarged iron stores. Improvements in heamatological indices were associated with compromised baseline iron status, prolonged intervention period and increase in dietary iron intake.ConclusionDietary iron interventions using a staple cereal product offer an alternative way of improving dietary iron intake and favourable affecting overall iron status in physically active females.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dietary iron intervention using a staple food product for improvement of iron status in female runners

Alaunyte

Stojceska

Plunkett

et al. 2014

Journal of the International Society of Sports Nutrition

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“…Studies using dietary iron treatment approach rather than pharmaceutical iron supplementation in female athletes are scarce. Dietary iron treatment methods used in literature include the prescription of an iron-rich diet [ 42 , 43 ] or/and haem iron-based diet [ 11 , 13 ], dietary advice counselling [ 12 ] and inclusion of novel iron-rich products into the daily diet [ 1 ]. The summary of diet modification studies is presented in Table 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Other dietary intervention studies have demonstrated more positive effects on iron status in female athletes. A four week iron-rich diet, which provided 18.2 mg of iron daily, resulted in significantly higher serum ferritin concentrations in rhythmic gymnasts [ 43 ]. The study however did not assess their performance during the trial and hence, no conclusions can be drawn as to any possible effects on exercise performance.…”

Section: Introductionmentioning

confidence: 99%

Iron and the female athlete: a review of dietary treatment methods for improving iron status and exercise performance

Alaunyte

Stojceska

Plunkett

2015

Journal of the International Society of Sports Nutrition

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Iron is a functional component of oxygen transport and energy production in humans and therefore is a critically important micronutrient for sport and exercise performance. Athletes, particularly female athletes participating in endurance sport, are at increased risk of compromised iron status due to heightened iron losses through menstruation and exercise-induced mechanisms associated with endurance activity. Conventionally oral iron supplementation is used in prevention or/and treatment of iron deficiency. However, this approach has been criticised because of the side effects and increased risk of iron toxicity associated with the use of supplements. Thus, more recently there has been a growing interest in using dietary modification rather than the use of supplements to improve iron status of athletes. Dietary iron treatment methods include the prescription of an iron-rich diet, or/and haem iron-based diet, dietary advice counselling and inclusion of novel iron-rich products into the daily diet. Although studies using dietary modification are still scarce, current literature suggests that dietary iron interventions can assist in maintaining iron status in female athletes, especially during intensive training and competition. Future research should focus on the most efficient method(s) of dietary modification for improvement of iron status and whether these approaches can have a favourable impact on sports and exercise performance.

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“…All RG were dieting in spite of the fact that they were extremely lean, and delayed maturity, menstrual irregularities, energy deficit, high training volume, and high frequency of injuries were common in the RG group (7). Lower energy intake is sometimes related to low intakes of many nutrients, and often results in malnutrition, anemia, iron deficiency or chronic within-day energy deficits (5)(6)(7)(8). Physicians, parents, and coaches have pointed out the need for guidance to correct errors in dietary behaviors, to avoid excessive food restrictions (6), and to learn more about risk factors (7).…”

mentioning

confidence: 99%

Time-of-Day of Energy Intake Is Associated with Body Fat Percentage in Japanese Female University Rhythmic Gymnasts and Non-Athlete Students

Matsushita

Hashizume²,

Kisara

et al. 2019

J Nutr Sci Vitaminol

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This study investigated whether body fat percentage (BF%) in Japanese female university rhythmic gymnasts (RG) and non-athletes (control) was associated with the time-of-day of energy intake. A total of 57 females (RG group, n534; control group, n523) completed 24-h dietary recall surveys on 3 non-consecutive days. BF% was measured using a bioelectrical impedance analyzer after overnight fasting. Energy intake was stratified by time-of-day: morning (3:00 to 11:00), midday (11:00 to 17:00), evening (17:00 to 21:00), and nighttime (21:00 to 3:00). There was no significant difference between the groups in total energy intake, body weight, or body mass index. The RG group had significantly higher energy expenditure, a larger negative energy balance and lower BF% than the control group. The energy intake ratios (ER%) in the evening and at nighttime in the RG group were significantly lower and higher than in the control group, respectively. Total energy intake and energy balance did not show any significant association with BF% in either group. Multivariate linear regression with substitution model indicated that a substitution of ER% in the morning for ER% at nighttime was negatively associated with BF% after adjusting for confounding factors (b520.240; 95% confidence interval (CI): 20.455, 20.025) in the control group. In the RG group, a substitution of ER% in the evening for ER% at nighttime was negatively associated with BF% (b520.117; 95%CI: 20.214, 20.019). These results suggest that the timing of energy intake throughout the day is associated with BF% in Japanese university RG and non-athlete female students.

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Effects of a Fixed Dietary Intake on Changes in Red Blood Cell Delta-Aminolevulinate Dehydratase Activity and Hemolysis in Female Rhythmic Gymnasts: A Two-Year Follow-Up Study ▀

Cited by 11 publications

References 24 publications

Dietary iron intervention using a staple food product for improvement of iron status in female runners

Dietary iron intervention using a staple food product for improvement of iron status in female runners

Iron and the female athlete: a review of dietary treatment methods for improving iron status and exercise performance

Time-of-Day of Energy Intake Is Associated with Body Fat Percentage in Japanese Female University Rhythmic Gymnasts and Non-Athlete Students

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