Eurycoma longifolia supplementation increases testosterone levels in humans via activation of the hypothalamic‐pituitary‐gonadal axis and/or the hypothalamic‐pituitary‐adrenal axis mainly in older adults and nonhealthy populations. This study aimed to assess the impact of Eurycoma longifolia on the hypothalamic‐pituitary‐gonadal and hypothalamic‐pituitary‐adrenal axes in healthy young males since this might promote functional testosterone prowess. Thirty‐two males (24.4 ± 4.7 years; 1.74 ± 0.07 m; 73.7 ± 8.4 kg) in a placebo‐controlled, double‐blind, matched‐paired study received 600 mg/day Eurycoma longifolia or placebo for two weeks. Blood analysis using repeated measures analysis of variance showed significant interaction and time effects for testosterone (F1,30 = 9.04, p = .005), free testosterone (F1,30 = 7.13, p = .012) and estradiol (F1,30 = 8.07, p = .008) levels in favour of the treatment group, while luteinising hormone, follicle‐stimulating hormone and sexual hormone‐binding globulin did not. The lack of changes in luteinising hormone and follicle‐stimulating hormone levels suggests that a lesser role played by Eurycoma longifolia in activating the hypothalamic‐pituitary‐gonadal axis in the young adults. The raised testosterone level may be due to a greater rate of hormone production via the hypothalamic‐pituitary‐adrenal axis. The supplementation of Eurycoma longifolia for two weeks demonstrates steroidogenic effects on young men were dose‐related. Consequently, the raised testosterone following Eurycoma longifolia supplementations could benefit muscle and strength gain in young adults.
Despite the fact that High Intensity Intermittent Training (HIIT) resulted in physiological adaptations and started to be applied on racket sport, the effectiveness of HIIT in a multi-shuttle feeding form to improve physical performance in badminton has not been extensively examined. This study investigated the effects of high intensity intermittent badminton multi-shuttle (HIIBMS) feeding training on aerobic and anaerobic capacity, leg strength qualities and agility. Eighteen university college badminton players aged 20±1 (BW = 65.3±11kg; H =173.0±5.3cm) participated in this study. Based on the initial test results on aerobic and anaerobic capacity, leg reactive strength, and agility parameters, subjects were randomly selected and assigned into 2 groups (control group [CG], experimental group [EG]). Both groups had similar badminton training while additional training of HIIBMS feeding training was given to the EG for the duration of 4 weeks. The subjects were tested on VO2 max Test, Wingate Ergometer Test, Countermovement Vertical Jump, Drop Jump and Illinois Agility Test for the pre-test and post-test. Pre-test results showed insignificant differences between two groups implying that the they started equal in terms of 6 variables. Similarly, post-test revealed non-significant results for all the 6 variables. However, the comparison of pre-test and post-test mean scores showed significant improvements in VO2max, mean power, leg reactive strength and agility except peak power and jump height in EG with CG showed no improvement in all parameters.
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