Purpose: Bone mineral density (BMD) is modified by environmentalfactors like diet, nutritional status and exercise. Athletes have higherbone turnover than sedentary individuals but prolonged exercisemight result in a negative remodeling balance and compromiseskeletal health. Strenuous exercise and fasting may induce osteoclasticactivity that is not necessarily accompanied by a compensatoryincrease in osteoblastic activity. The purpose of this study was tounderstand if there is specific nutrition to allow best performance andreduce bone resorption that occurs after exercise in athletes.Methods: A group of 28 gymnasts aged between 9 and 14 years old(13 ± 1.71) playing artistic gymnastics for at least 6 years at a precompetitivelevel were enrolled in our study. Subjects were evaluatedby anthropometric measurements (weight, height, BMI, % FM,%Lm,% W,% BM) and by self-report questionnaires (ESPQ, EnergySelf-Perception Questionnaire) at the end of a training session. Thesubjects were divided into a sandwich group (SG) with carb-basedsnacks, and a cereal group (CG) with the other carb/protein basedsnacks. The different isocaloric meals of 330 kCal had the followcomposition: SG 40.6 g carbs, 13.85 g pro, 4.7 g fats and GC with68 g carbs, 7 g pro, 2 g fats. Food was administered 90 minutesbefore a 90-min high-intensity training session. To check the energystatus of athletes after taking the two different snacks and to evaluatebone resorption, the C-terminal telopeptide of type I collagen (CTX),glucagon-like peptides (GLP) 1 and 2, and the gastric inhibitorypolypeptide (GIP) was analysed from four urine samples, collected atdifferent time points: pre-snack (t0); after 90 minutes from the snack(t1); at the end of training (t2); after 60 minutes from the end oftraining (t3). To evaluate these markers, we used a flow technologycoupled with an ORBITRAPTM mass spectrometer.Results: The snacks provided had a positive effect on the performanceof the gymnasts. In particular, 55% felt a change in theirperformance and reported an increase in energy and attention duringtraining. All the gymnasts involved in the study showed the same leanmass of 39.7% and bone mass 9.4%; the responders also reported animprovement in energy during the training after the intake snackprovided (36%).Conclusions: In conclusions, concerning the assessment ofbiomarkers of bone resorption, there are some evidence that show achange following the snacks intake. In particular the results suggeststhat the consumption of a carbs meal before training reduces postexercise resorption in athletes, as evidenced by reduced CTX levelssixty minutes after the end of physical activity.A suitable pre-workout snack based carbs is essential to improveperformance, reduce fatigue and bone resorption in young gymnasts.This is a pilot study that needs a deep investigation to confirm thepreliminary results obtained.
|Numero di pagine||1|
|Rivista||SPORT SCIENCES FOR HEALTH|
|Stato di pubblicazione||Published - 2019|