Effects of Caffeine on Physiological Responses to Exercise in Young Boys and Girls

Turley, Kenneth R.; Gerst, Jonathan W.

doi:10.1249/01.mss.0000191189.40436.73

Cited by 25 publications

(40 citation statements)

References 30 publications

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“…The lack of differences in RER is in agreement with other studies in which similar dosage of caffeine was used [10, 12,35] and that energy expenditure was stimulated by increasing both lipid and carbohydrate oxidation in both lean and obese men to a comparable degree. This might mean that the effects of caffeine were due to either increasing plasma FFA in lean and obese subjects alike or to enhance FFA oxidation to a similar degree despite differences between lean and obese subjects in the amounts of FFA in plasma.…”

Section: Discussionsupporting

confidence: 91%

“…That contrast may have been be due to higher intensity (60 vs. 50% ‡O 2 max) but shorter duration (30 vs. 60 min) of exercise used in our study. Caffeine was shown to decrease heart rate in lowintensity exercises or at rest [10, 25,35] but in heavy, submaximal exercises HR would remain unchanged [8,12,25,37]; it seems likely that caffeine increases the stroke volume only at a low work intensity. Heart rate in our study was significantly higher in obese than in lean subjects and the same was found by Bracco et al [4] in women performing treadmill exercise (30 min at 50% ‡O 2 max).…”

Section: Discussionmentioning

confidence: 99%

“…It was also reported that metabolic effects of caffeine under resting conditions consist of a temporary increase of calorie consumption [19,22,29]. Although some authors claimed that caffeine might significantly augment fat oxidation and energy consumption during prolonged activities at low or moderate intensities (below 60% ‡O 2 max) [6,11,13], other studies did not confirm those findings [10,35].…”

Section: Introductionmentioning

confidence: 99%

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Effect of caffeine on metabolic and cardiovascular responses to submaximal exercise in lean and obese men

Damirchi

Farhad

Mirzaie

et al. 2009

Biomedical Human Kinetics

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SummaryStudy aim: To compare the effects of caffeine on metabolic and cardiovascular responses to exercise in lean and obese subjects. Material and methods: In a double blind random design, 6 lean (BMI<20) and 6 obese (BMI>28) sedentary young men performed treadmill running for 30 min at similar exercise intensities (60% ‡O 2 max) one hour after caffeine (5 mg/kg body mass) or placebo ingestion. Gas exchange was measured by indirect calorimetry/open-circuit spirometry. Heart rate (HR) was measured throughout the exercise. Blood pressure (BP) measurements were taken at baseline, 1 h after caffeine/placebo ingestion and immediately after exercise. Repeated measures ANOVA was used in data analysis. Results: Caffeine significantly (p<0.05 -0.01) increased the exercise-induced oxygen uptake, energy expenditure, systolic blood pressure and heart rate in both groups, the respiratory exchange ratio remaining unchanged. The effects of caffeine were in both groups alike. Conclusions: Caffeine activates metabolism without inducing major changes in fat/carbohydrate oxidation. The differences in body fat content seem not to affect the caffeine-induced effects in a submaximal exercise.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of caffeine on metabolic and cardiovascular responses to submaximal exercise in lean and obese men

Damirchi

Farhad

Mirzaie

et al. 2009

Biomedical Human Kinetics

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“…Such increased oxygen consumption during and after exercise may enhance ROS production in different tissues. Caffeine supplementation may inhibit the deleterious effects caused by the presence of free radicals (Pinho et al, 2006;Turley & Gerst, 2006;Aguiar et al, 2008). Therefore, the aim of the present study was to analyze the effect of caffeine supplementation on the oxidative stress, inflammatory markers, performance and physiological variables of young individuals subjected to two maximum treadmill tests in a week interval.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Caffeine Supplementation on Trained Individuals Subjected to Maximal Treadmill Test

Salicio

Fett

Salicio

et al. 2016

AJTCAM

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Background: Intense physical training increases oxidative stress and inflammation, resulting into muscle and cellular damage. The aim of this study was to analyze the effect of caffeine supplementation on trained young individuals subjected to two treadmill maximal tests. Materials and Methods: It was a double-blind and crossover study comprising 24 active individuals within the age group 18-30 years. The comparisons were conducted: the effect of exercise (week 1 x 2) and caffeine intake (GC x GP) on thiobarbituric acid (TBARS), interleukin 6 (IL-6), interleukin 10 (IL-10) and superoxide dismutase (SOD) variables during pre-exercise time (30 min. after caffeine or placebo intake) and post-exercise (5 min after treadmill test). Results:The comparison between weeks 1 and 2 showed increase in the first week, in the following items: TBARS, IL-6 and IL-10 in the GC and GP groups. The comparison within the same week showed that GC individuals presented lower post-exercise TBARS values in the first and second weeks; IL-6 presented higher post-exercise values in the GC group in both weeks. The paired analysis comparing pre-and post-exercise, with and without caffeine showed that IL-6 presented higher post-exercise values in the GC group. Conclusion: Caffeine used by athletes can decrease oxidative stress. The increased IL-6 suggest that this ergogenic supplement may stimulate muscle hypertrophy, since IL-6 has myokine effect. However, the caffeine effect on IL-6 level and muscle hypertrophy increase should be better investigated in future studies.

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“…Adicionalmente, o balanço autonômico também confirmou um aumento da atividade simpática na sessão cafeína. Os estudos dos efeitos da cafeína em hipertensos nas variáveis autonômicas ainda mais escassos, Nishijima et al (2002) Por fim com relação a frequência cardíaca a literatura vigente tem mostrado que cafeína provoca efeitos bastante controversos (Ahrens, Crixell, Lloyd, & Walker, 2007;Turley & Gerst, 2006). No estudo de Perkins et al, (1994) …”

Section: Discussionunclassified

Effect of Caffeine on Hemodynamics and Autonomics Parameters in Hypertensive Women after Aerobic Exercise

et al. 2017

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ARTIGO ORIGINAL | ORIGINAL ARTICLE RESUMOO objetivo do estudo foi analisar o efeito da ingestão de cafeína sobre a modulação autonômica cardíaca e da pressão arterial pós-exercício aeróbio em mulheres hipertensas. Participaram do estudo doze mulheres hipertensas (55±4 anos), consumidoras habituais de cafeína. Foram registrados no repouso e pós exercício aeróbio o eletrocardiograma e a pressão arterial. Todos os sujeitos ingeriram cafeína ou placebo (4mg/kg corporal), esperaram 30 minutos e realizaram exercício em esteira por 30 minutos com intensidade entre 60 e 70% da frequência cardíaca de reserva. Pressão arterial sistólica aumentou de forma significativa na sessão cafeína em relação ao repouso e quando comparada ao placebo (p < 0.05). Componente espectral de baixa frequência e balanço simpato-vagal, aumentaram significativamente quando comparado ao repouso na sessão cafeína. Opostamente na sessão placebo, baixa frequência e balanço simpato-vagal reduziram de forma significativa (p < 0.05). Na comparação entre as sessões cafeína e placebo, observou-se que baixa frequência e balanço simpato-vagal foram significativamente maiores na sessão cafeína (p < 0.05). Deste modo podemos sugerir que a ingestão de cafeína aumentou a atividade simpática cardíaca com consequente aumento da pressão arterial sistólica pós-exercício aeróbio, o que poderia estar relacionado a uma possível reação hipertensiva em mulheres hipertensas de meia idade. Palavras-chave: exercício aeróbio, hipertensão, modulação autonômica cardíaca, cafeína. ABSTRACTThe aim of this study was to analyse the effect of caffeine consumption on cardiac autonomic modulation and arterial blood pressure after aerobic exercise in hypertensive women. Twelve hypertensive women participated in this study (55±4 years old), habitual consumers of caffeine. The electrocardiogram and the arterial blood pressure were recorded during rest and after aerobic exercise. All subject ingested caffeine or placebo (4mg/kg), waited 30 minutes and exercised on a treadmill for 30 minutes with intensity of 60% and 70% of the reserve heart rate. Systolic arterial blood pressure rose significantly in the caffeine session compared to rest and placebo session (p < 0.05). Spectral component of low frequency and sympathovagal balance increased dramatically when compared to baseline in caffeine session. In contrast, during the placebo session, the low frequency and sympathovagal balance decreased significantly (p < 0.05). When compared the caffeine and placebo sessions, it could be seen that the low frequency and sympathovagal balance were significantly higher in caffeine session (p < 0.05). Thus, it can be suggested that the consumption of caffeine increased the cardiac sympathetic activity with resulting increase of systolic arterial blood pressure after aerobic exercise, which could be related to a possible hypertensive reaction in hypertensive middle-aged women.

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Effects of Caffeine on Physiological Responses to Exercise in Young Boys and Girls

Abstract: A moderate dose of caffeine (5 mg.kg) does not affect metabolism (VO2 or RER) in young children at low-moderate intensities of exercise. However, CAF causes a significantly lower HR (bpm) and higher BP (mm Hg) in both young boys and girls.

Cited by 25 publications

References 30 publications

Effect of caffeine on metabolic and cardiovascular responses to submaximal exercise in lean and obese men

Effect of caffeine on metabolic and cardiovascular responses to submaximal exercise in lean and obese men

The Effect of Caffeine Supplementation on Trained Individuals Subjected to Maximal Treadmill Test

Effect of Caffeine on Hemodynamics and Autonomics Parameters in Hypertensive Women after Aerobic Exercise

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