Plasma Volume Response to 30-s Cycle Ergometry

Retallick, Christopher; Baker, Julien S.; Williams, Simon; Whitcombe, D.; Davies, Bruce

doi:10.1249/mss.0b013e318093f585

Cited by 9 publications

(13 citation statements)

References 35 publications

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“…One limitation of our study is that possible changes in plasma volume concentration (PVC) through short‐time exercise were not taken into consideration. It has been shown that in high‐intensity, short‐time exercise with cycle ergometer changes of PVC of 12–15.6% can be found (van Beaumont et al, 1973; El‐Sayed et al, 1990; Gillen et al, 1991; Boulay et al, 1995; Kargotich et al, 1998) and biochemical data should be corrected for PVC (Kargotich et al, 1997; Retallick et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Acylated ghrelin increases after controlled short‐time exercise in school‐aged children

Sauseng

Nagel

Gamillscheg

et al. 2011

Scandinavian Med Sci Sports

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Ghrelin is a peptide hormone, which plays an important role in appetite regulation. The effects of exercise on ghrelin plasma concentrations are still not clear, especially in children and adolescents. The aim of this study was to investigate the response of acylated and total ghrelin concentrations to controlled exercise in school-aged children. Thirty-six healthy school-aged children (mean age 12.61 years, SD ± 0.39) underwent a controlled bicycle exercise test. Before and immediately after exercise, blood samples were taken in order to measure plasma ghrelin concentrations. The control group consisted of 24 healthy school-aged children. After controlled short-time exercise, total ghrelin concentrations showed no significant difference, whereas acylated ghrelin concentrations increased significantly (P<0.001) in the study population compared with the control group. Moreover, we found a correlation between the proportional increase of acylated ghrelin and the duration of exercise (P<0.01), and between the proportional increase of acylated ghrelin and maximal performance (P<0.01). Increased levels of acylated ghrelin after exercise could be a physiological response to ensure a sufficient caloric intake after energy consumption in children and adolescents.

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Section: Discussionmentioning

confidence: 99%

Acylated ghrelin increases after controlled short‐time exercise in school‐aged children

Sauseng

Nagel

Gamillscheg

et al. 2011

Scandinavian Med Sci Sports

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“…The average intra-assay coefficient of variation (calculated for ten duplicated samples) for MDA and CK was 7.5 and 8.3 %, respectively. Due to the decreased plasma volume following exercise [ 30 ], plasma volume was corrected for post-exercise changes by considering the changes in hematocrit according to the Dill and Costill method [ 31 ].…”

Section: Methodsmentioning

confidence: 99%

The effect of green tea extract supplementation on exercise-induced oxidative stress parameters in male sprinters

et al. 2014

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BackgroundAlthough research suggests that antioxidant supplementation can protect against exercise-induced muscle damage and oxidative stress, also delayed post-exercise muscle recovery and hindered adaptation to training were reported in the supplemented athletes. PurposeThe purpose of the study was to evaluate the effects of green tea extract (GTE) supplementation on selected blood markers of oxidative stress and muscle damage in sprinters during preparatory phase of their training cycle.MethodsSixteen sprinters participated in a double-blind, randomized, placebo (PL)-controlled crossover study, including two 4-week treatment periods with PL and GTE (980 mg polyphenols daily). The sprinters performed two repeated cycle sprint tests (RST; 4 × 15 s, with 1-min rest intervals), after PL and GTE supplementation. Blood was sampled before (at rest), 5 min after RST, and after the 24-h recovery. The activities of superoxide dismutase (SOD) and glutathione peroxidase were measured in erythrocytes, and total polyphenols, total antioxidant capacity (TAC), uric acid (UA), albumin (AL), malondialdehyde (MDA), and creatine kinase (CK) were determined in blood plasma.ResultsRepeated cycle sprint test performed after PL induced an increase in MDA, TAC, and SOD. Moreover, an increase in UA, AL, and CK was observed after RST irrespective of experimental conditions (PL, GTE). Supplementation with GTE caused an increase in total polyphenols and TAC at rest, and a decrease in MDA and SOD after RST. No significant changes in sprint performance were noted after GTE, as compared to PL.ConclusionsSupplementation with GTE prevents oxidative stress induced by RST in sprinters. Furthermore, GTE supplementation does not seem to hinder training adaptation in antioxidant enzyme system. On the other hand, neither prevention of exercise-induced muscle damage, nor an improvement in sprint performance is noted after GTE administration.

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“…This mechanism of muscle damage has been observed, for instance, among rugby players due to repetitive collisions [12]. The final CK level was, however, approximately three-fold lower than the average values recorded among male wrestlers during their preparatory and competition season [21], which resulted in the well-documented gender differences.…”

Section: Discussionmentioning

confidence: 76%

“…Short lasting, very intensive effort triggers a temporary and transient plasma volume (PV) decrease of 10-15% [10,21]. Thus, this effect contributes to the rise of each plasma parameter by a similar value regardless of the contribution to the other factors influencing the concentration, such as the rates of the secretion and elimination from circulation.…”

Section: Study Limitationsmentioning

confidence: 99%

Physiological and perceptual responses to three consecutive official matches in female boxer. A case study

Obmiński

Turowski

2014

Biomedical Human Kinetics

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Summary Study aim: The purpose of this study was to assess the physiological cost of three consecutive official boxing fights played during a 3-day tournament and two non-contact specific drills against handheld pads of the same time-profile as the contest, 4 × 2 minutes with 1-minute intervals between them. This assessment was based on the determination of selected hormones and metabolites in the blood sampled directly prior to the contests and throughout short-term post-contest recovery. Material and methods: A female amateur boxer was enrolled on the study during a 3-day Polish Boxing Championship, where one match was played on each day. The timing of capillary blood sampling during each match and the drill was as follows: 10 minutes prior to the effort, and 3 and 30 minutes after its completion. Cortisol (C), testosterone (T), and glucose (G) were determined in the serum, while lactate (LA) was determined in the blood. In addition, prior to each effort, serum creatine kinase (CK) and urea (U) was determined. Directly after each effort, the perception of fatigue (PF) was rated. Results: G, C, and T during official matches were significantly higher than those during non-contact drills. Post-event G, C, T, and LA were higher compared to pre-event values. Conclusions: An official boxing match produced higher stress than a drill of the same time-profile and similar modality. Changes in blood indices corresponded well with the perception of fatigue.

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Plasma Volume Response to 30-s Cycle Ergometry

Abstract: Our data show that short-duration, high-intensity cycle ergometer exercise tests can induce significant plasma volume decreases in untrained subjects, which may affect the interpretation of bloodborne biochemical parameters.

Cited by 9 publications

References 35 publications

Acylated ghrelin increases after controlled short‐time exercise in school‐aged children

Acylated ghrelin increases after controlled short‐time exercise in school‐aged children

The effect of green tea extract supplementation on exercise-induced oxidative stress parameters in male sprinters

Physiological and perceptual responses to three consecutive official matches in female boxer. A case study

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