ECSS Paris 2023: OP-PN08
INTRODUCTION: It is unknown whether an appropriate amount of exogenous antioxidant intake is present to maximize the exercise benefit on lifestyle-related diseases. The purpose of this study was to investigate the effects of two levels of exercise stress and exogenous antioxidant doses on exercise-induced oxidative stress, antioxidant capacity, and inflammatory response. METHODS: Wistar male rats were divided into two groups; sedentary (SED) and exercise (TR). The exercise was increased from 4 weeks of low-intensity (90 min/week) to 4 weeks of high-intensity (300 min/week). TR was subdivided into low (70 mg/kg: TR+N), medium (350 mg/kg: TR+VE-M), and high (700 mg/kg: TR+VE-H) according to the amount of vitamin E intake. Oxidative stress (d-ROMs), antioxidative capacity (BAP), and inflammatory response (hs-CRP: high sensitive C-reactive protein) were measured with blood samples before and after each exercise load PGC1-α was measured with muscle samples using real-time PCR. RESULTS: d-ROMs increased as exercise intensity was augmented in all TR and was higher in TR+N and TR＋VE-M than in SED after high-intensity exercise, while it was not different between SED and TR+VE-H. hs-CRP increased in TR+N and TR+VE-H after high-intensity exercise as compared with before. PGC1-α increased only in TR+VE-M after high-intensity exercise. CONCLUSION: Only medium doses of vitamin E intake may suppress the inflammatory response to oxidative stress during a large amount of exercise without inhibiting the expression of the transcription factor PGC1-α, suggesting the presence of an appropriate dose for exogenous antioxidant intake during exercise.
Read CV RINA SUZUKIECSS Paris 2023: OP-PN08
INTRODUCTION: This study investigated the effects of seven-week Amaranthus hypochondriacus supplementation on aerobic capacity and exercise performance in karate athletes participating in state and national-level tournaments. The research aimed to evaluate the impact of Amaranthus hypochondriacus supplementation as an ergogenic aid on cardiorespiratory fitness markers and muscular strength in combat sports athletes to improve their performance. METHODS: Forty-three karate athletes (31 male and 12 female) aged (18±0.53years), with body mass index (BMI) of (21±1.04) competing at national and state levels, participated in this study. Participants were randomly assigned to either an experimental group receiving Amaranthus supplementation (n=27) or a control group (n=18) for six weeks. The Amaranthus supplement was administered in a standard dosage of approx. 20g/d, accounting for body weight and training volume. Pre- and post-intervention assessments measured aerobic capacity and exercise performance using Cardiopulmonary Exercise Testing (CPET) (K5 COSMED). Using a hand grip dynamometer, muscle strength was measured through push-ups, hand grip, and squats. RESULTS: The seven-week supplementation trial yielded notable improvements in the experimental group (EXP) versus the control group (CON). Cardiorespiratory markers showed significant improvements, with an increase of 9.10% in VO2max (ml/kg/min) in the EXP group; CON (35±1.2) and EXP (40±1.12) (p<0.05) and improved HRmax(bpm), recovery patterns including respiratory exchange ratio (RER): CON (1.02±0.11), EXP (1.05±0.02)(p<0.05); Respiratory Quotient(RQ): CON(1.15±0.05), EXP(1.21±0.03)non-significant; Ventilatory Threshold(VT)(ml/min) CON(2244±154), EXP(2274±120)(p<0.05). Strength parameters demonstrated marked progress in the EXP group, particularly a 2.61% increase in upper body strength. Anaerobic capacity (30-yard sprint) increased in EXP Group. CONCLUSION: Seven-week Amaranthus hypochondriacus supplementation significantly improved karate athletes cardiorespiratory fitness and strength parameters. Notable enhancements were observed in VO2 max, respiratory markers (RER, VT), upper body strength, and aerobic and anaerobic capacity. These findings provide valuable insights for athletes, coaches, and sports nutritionists in optimizing performance through supplementation strategies.
Read CV ANIL CHAHARECSS Paris 2023: OP-PN08
INTRODUCTION: Participation in hybrid athletic events, such as CrossFitTM and HyroxTM, has led to an increase in hybrid athletes that require well developed strength, endurance, agility, and power. There is a high prevalence of ergogenic aid consumption among hybrid athletes [1]. Understanding the effects of ergogenic aids in improving this performance is crucial. Pycnogenol (PYC) is a dietary supplement extracted from French maritime pine bark, which is marketed for its antioxidant, anti-inflammatory and blood flow modulating effects, which can impact on performance and recovery. This study investigated the effect of 2-week PYC supplementation on physical performance in trained hybrid athletes. METHODS: In a randomised, single-blind, cross-over study design, 12 (7 female, 6 male, age = 26-38 years) hybrid classified athletes performed a graded exercise test, countermovement jump (CMJ), isometric mid-thigh pull (IMTP), 30 s Wingate test, and back squat 1 repetition maximum (1RM) before and after two weeks of either PYC (260 mg/day PYC) or placebo (PLA: 0 mg/day PYC) daily oral supplementation. Following a 14-day wash-out, participants repeated all tests, which served as the baseline performance for their second counter supplementation period. Post-testing was performed 2-weeks after initial second supplementation period began. Linear mixed models analysed the effect of the treatment × time, adjusting for potential sequence/carry-over effects, sex, and age. Results are expressed as the raw parameter estimate (β) ± 95% confidence intervals. RESULTS: When controlling for sex and age, no time × treatment effect was present for V̇O2peak (-0.5 mL/kg/min [-2.28, 1.30]). Fatigue index (-10% [-25, 4]), peak power (-2 W, [-110,105]), relative peak power (-0.1 W/kg [-0.4, 0.3]), and average power (-0.1 W [-48, 5]) achieved during the 30 s Wingate test failed to display a time × treatment effect, when controlling for sex. Similarly, when controlling for age and sex, no time × treatment existed for CMJ height (0.1 cm [-2.7, 2.9]), IMTP rate of force development 200 ms (86.9 N/s [-1016, 1190]), IMTP relative peak vertical force (-1.81 N/kg [-4.16, 0.54]), and back squat 1RM (0.2 kg [-4.08, 4.50]). CONCLUSION: In our cohort and sample size, 2-weeks of 260 mg/day PYC supplementation provided no benefit compared to a PLA on V̇O2peak, countermovement jump height, IMTP measurements, 30s wingate measurements and 1RM back squat. Therefore, 2-week PYC (260 mg/day) had no impact on physical performance of hybrid athletes. Future studies should aim to investigate the effect of dosage and supplement duration on hybrid athlete performance. REFERENCES: 1. Vinicius M, Camila Guazzelli Marques, Carolina A, Cirillo L, Roberta Beltrame Ciudi, Lucas Scalabrin Oliveira, et al. Prevalence of dietary supplement consumption among CrossFit practitioners. Nutrire. 2023 Feb 13;48(1).
Read CV Samantha KucewiczECSS Paris 2023: OP-PN08