Publications by authors named "HACKNEY A"

Purpose: The impact of weight cycling (WC)-successive weight loss (WL) and weight regain (WG)-on athlete performance is well documented, but effects on appetite are not. This study assessed the impact of a WC episode on dietary and appetitive profiles in athletes, considering sex and sport type.

Methods: Athletes (28 male, 20 female) from combat (n = 23), strength (n = 12), and endurance (n = 13) sports participated in 3 conditions during a WC episode (baseline, WL, WG).

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Introduction: The present scientific consensus is that the menstrual cycle (MC) and hormonal contraceptive (HC) cycle only influence performance trivially. Nevertheless, athletes perceive changes in performance that they associate with different phases of their hormonal cycle.

Methods: A total of 959 female athletes completed a questionnaire, of which 750 were included in the present analysis.

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Decreased physical activity and high blood pressure are both risk factors for cardiovascular diseases. Controlling blood pressure within the normal range can prevent or delay these complications. This systematic review and meta-analysis analyzed the effects of different types of exercise training on the blood pressure and lipid profiles of older adults patients with hypertension.

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Background/objective: Cellular immune markers of inflammation such as neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR) and systemic immune inflammation index (SII) are frequently used in patient care. The adoption of these markers to elite sports, e.g.

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Article Synopsis
  • * Participants were divided into two groups: one group performed RT while fasting in the late afternoon, and the other did the same at night after breaking their fast.
  • * Results showed significant improvements in muscle strength and changes in hormone levels, with the night training group (FED) showing greater enhancements in strength measures compared to the fasting group (FAST).
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  • Discrimination in evaluations contributes significantly to social inequality, yet there is limited knowledge about psychological interventions to combat biased assessments.
  • A research contest tested 30 interventions aimed at reducing discrimination based on physical attractiveness, revealing two effective strategies that reduced both decision noise and bias.
  • The findings highlight the need for concrete strategies that focus on relevant criteria in decision-making and emphasize the challenge of developing scalable interventions to effectively change discriminatory behaviors across various contexts.
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Article Synopsis
  • The study aimed to investigate the relationship between self-reported indicators of low energy availability (LEA-I) and race performance as well as medical incidents during the Boston Marathon.
  • A survey of 1,030 runners revealed a higher prevalence of LEA-I in females (42.5%) compared to males (17.6%), with athletes experiencing LEA-I performing worse in terms of race times and placement.
  • The findings indicated that runners with LEA-I had significantly increased risks of medical encounters during the race, underscoring the negative impacts of low energy availability on marathon performance and health.
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Excessive exercise can induce cell damage and impair muscle function by generating oxidative stress. Carob rich phenolic components have attracted the attention of many researchers because of their antioxidant actions. We utilized a double-blind randomized placebo-controlled design to study the putative antioxidant role of six weeks of daily polyphenol supplementation on selected blood markers of oxidative stress and performance in taekwondo athletes.

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Background: Dysregulation of adipocyte function occurs in obesity. Meteorin-like protein (Metrnl) is a newly discovered modulator of inflammation, metabolism, and differentiation of human adipocytes. The dietary supplement Chlorella Vulgaris (CV) reduces hyperlipidemia, hyperglycemia, and oxidative stress in clinical trials.

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Background: Female-specific science, medicine, and innovation have grown steadily since the turn of the decade as the focus on female sport continues to advance. While this growth is welcome, and despite the best of intentions, it is not always coupled with valuable application.

Purpose: This commentary discusses barriers faced when developing and applying sport-science research and innovation activities in female sport.

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Background: Strength training (ST) primarily enhances physical fitness (e.g., muscle strength, power, speed) and bone density in female soccer players.

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Introduction: To evaluate the effects of oral contraceptive (OC) and hormonal intrauterine device (H-IUD) use, compared with an eumenorrheic (EUM) cycle, on maximal strength and power between hormone phases.

Methods: One-repetition maximum (1RM) leg press and bench press, peak force from knee extension and upright row isometric dynamometry, and power from vertical jump height and reactive strength index (cm·s -1 ) were measured in 60 healthy, active women (mean ± SD; age: 26.5 ± 7.

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Introduction: Resting energy expenditure (REE) may fluctuate during the menstrual cycle (MC), due to the physiological effects of estradiol (E2) and progesterone. This study examined changes in REE and metabolic hormones (leptin, ghrelin, thyroid hormones), and dietary intake in two hormonally distinct groups, naturally menstruating women (NoOC) and women using monophasic combined oral contraceptives (COC).

Methods: Measurements included REE by indirect calorimetry, body composition by bioimpedance, and blood samples for hormone analysis in the early follicular and midluteal phases of the MC in the NoOC group ( n = 38) or the active and inactive phases of the COC cycle (COC; n = 19).

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Exercise and Neuroendocrinology.

Curr Top Behav Neurosci

November 2024

The intent of this chapter is to provide a basic overview and explanation of the neuroendocrine system responses to an exercise session in healthy adults. Specifically, the physiologic mechanisms for inducing the hormonal responses of this system and the scope of such responses are addressed. Additionally, factors that augment or attenuate exercise hormonal responses are presented as well as issues related to sex differences, and exercise-related hormonal dysfunction.

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Aims: To evaluate the effects of 12-week chlorella vulgaris (CV) combined with interval resistance training (IRT) on plasma levels of leptin, adiponectin and neuregulin-4 (Nrg-4) in obese men.

Methods: Obese men (n = 44, BMI of 32.1 ± 1.

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This study investigated the impact of intensive endurance exercise on circulating androgenic steroid hormones in women. Fifteen normally menstruating athletic women participated. They completed intensive endurance exercise (treadmill running) until volitional fatigue in their follicular phase, with blood samples collected at pre-exercise, volitional fatigue, 90 min and 24 h into recovery.

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Low energy availability, particularly when problematic (i.e., prolonged and/or severe), has numerous negative consequences for health and sports performance as characterized in relative energy deficiency in sport.

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Background: The pre-season preparatory period is considered key for optimizing the physical fitness levels needed to withstand congested match periods and preventing injuries during the regular soccer season. This study contrasted the effects s of neuromuscular training (NMT) versus an endurance-dominated training (ET) program conducted during the preseason on measures of physical fitness and injury occurrence in female soccer players.

Methods: Twenty-four female soccer players aged 17.

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Background: Intra-individual factors like ovarian hormone profiles and body weight variations may influence sports practice and performance in female athletes and need to be characterized. The "Answ'Her" questionnaire was designed to develop a relevant and reproducible field-based tool to assess self-reported ovarian hormone status (natural menstrual cycle and hormonal contraceptive use) and body weight variations practices among female athletes.

Methods: French females with a regular sports practice responded (once: N.

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Objective: The purpose of this study was to examine the effects of 10 weeks of high-intensity interval training (HIIT) and HIIT combined with circuit resistance training (HCRT) on selected measures of physical fitness, the expression of miR-9, -15a, -34a, -145, and - 155 as well as metabolic risk factors including lipid profiles and insulin resistance in middle-aged overweight/obese women.

Methods: Twenty-seven overweight/obese women aged 35-50 yrs. were randomized to HIIT (n = 14) or HCRT (n = 13) groups.

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Background: The rating of perceived exertion (RPE) is a readily available and practical tool widely used in exercise science to monitor exercise load, but a rigorous review of the effect of menstrual cycle (MC) phases on RPE within continuous aerobic exercise has not yet been completed.

Objective: This study investigated the effects of the MC phase on RPE during aerobic exercise.

Study Design: This was a systematic review and meta-analysis.

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Background: Previous studies reported differences in genotype frequency of the ACTN3 R577X polymorphisms (rs1815739; RR, RX and XX) in athletes and non-athletic populations. This systematic review with meta-analysis assessed ACTN3 R577X genotype frequencies in power versus endurance athletes and non-athletes.

Methods: Five electronic databases (PubMed, Web of Science, Scopus, Science Direct, SPORTDiscus) were searched for research articles published until December 31st, 2022.

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Cabre, HE, Ladan, AN, Moore, SR, Joniak, KE, Blue, MNM, Pietrosimone, BG, Hackney, AC, and Smith-Ryan, AE. Effects of hormonal contraception and the menstrual cycle on fatigability and recovery from an anaerobic exercise test. J Strength Cond Res 38(7): 1256-1265, 2024-This study sought to evaluate the effects of oral contraceptive (OC) and hormonal intrauterine device (H-IUD) use, compared with a eumenorrheic (EUM) cycle, on fatigability and recovery between hormone the phases.

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Throughout their lifespans, women undergo unique endocrinological changes relative to their reproductive hormones. The influence of how the female sex steroid hormones have nonreproductive actions is a trending topic of great interest in the exercise-sports sciences, especially among women of reproductive age. Herein, we present several key points on our perspective for moving the study of this topic forward in the future.

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Background: Intermittent exercise programs characterized through intensive exercise bouts alternated with passive or active recovery (i.e., interval training), have been proven to enhance measures of cardiorespiratory fitness.

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