scholarly journals Caffeine Supplementation for Powerlifting Competitions: an Evidence-Based Approach

2019 ◽  
Vol 68 (1) ◽  
pp. 37-48 ◽  
Author(s):  
Jozo Grgic ◽  
Filip Sabol ◽  
Sandro Venier ◽  
Jason Tallis ◽  
Brad J. Schoenfeld ◽  
...  
Keyword(s):  
Bench Press ◽  
Caffeine Intake ◽  
Evidence Based ◽  
Negative Effects ◽  
Caffeine Consumption ◽  
Caffeine Ingestion ◽  
Repetition Maximum ◽  
Rest Periods ◽  
Chronic Caffeine ◽  
Repeated Dosing

AbstractIn this paper, we review the effects of caffeine on muscle strength and provide suggestions for caffeine supplementation in powerlifting competitions. The currently available studies indicate that caffeine ingestion may enhance strength in two powerlifting competition events, the squat and the bench press. For the deadlift, the same might be expected even though studies directly using this event are lacking. Optimal doses of caffeine are likely in the range from 2 to 6 mg·kg−1, and are highly individual. When using caffeine-containing capsules, 60 minutes pre-exercise seems to be a good timing of caffeine consumption. For other sources such as caffeinated chewing gum, a shorter period (5 to 10 min) from consumption to the start of the exercise seems to be effective. For shorter duration powerlifting competitions (e.g., 2 hours), one pre-competition dose of caffeine could be sufficient for acute performance-enhancing effects that might be maintained across all three events. For longer duration competitions (with longer rest periods between one repetition maximum attempts), there might be a benefit to repeated dosing with caffeine; for example, ingesting smaller doses of caffeine before each attempt or event. During training, powerlifters may consider ingesting caffeine only before the training sessions with the highest intensity. This approach might eliminate the attenuation of caffeine’s effects associated with chronic caffeine ingestion and would help in maximizing performance benefits from acute caffeine ingestion at the competition. Nonetheless, withdrawal from caffeine (e.g., no caffeine intake seven days before competition) does not seem necessary and may have some indirect negative effects.

Rehydration after Exercise Dehydration in Heat: Effects of Caffeine Intake

2005 ◽  
Vol 14 (4) ◽  
pp. 294-300 ◽  
Author(s):  
João C. Dias ◽  
Melissa W. Roti ◽  
Amy C. Pumerantz ◽  
Greig Watson ◽  
Daniel A. Judelson ◽  
...  
Keyword(s):  
Outcome Measures ◽  
Urine Osmolality ◽  
Tolerance Test ◽  
Caffeine Intake ◽  
Hydration Status ◽  
Caffeine Ingestion ◽  
College Age ◽  
Heat Effects ◽  
Total Plasma Protein ◽  
Chronic Caffeine

Context:Dieticians, physiologists, athletic trainers, and physicians have recommended refraining from caffeine intake when exercising because of possible fluid-electrolyte imbalances and dehydration.Objective:To assess how 16-hour rehydration is affected by caffeine ingestion.Design:Dose–response.Setting:Environmental chamber.Participants:59 college-age men.Intervention:Subjects consumed a chronic caffeine dose of 0 (placebo), 3, or 6 mg · kg−1· day−1and performed an exercise heat-tolerance test (EHT) consisting of 90 minutes of walking on a treadmill (5.6 km/h) in the heat (37.7 °C).Outcome Measures:Fluid-electrolyte measures.Results:There were no between-group differences immediately after and 16 hours after EHT in total plasma protein, hematocrit, urine osmolality, specific gravity, color, and volume. Body weights after EHT and the following day (16 hours) were not different between groups (P> .05).Conclusion:Hydration status 16 hours after EHT did not change with chronic caffeine ingestion.

scholarly journals P.1.17 Working time, smoking, and caffeine intake by working type of taxi drivers in korea

2019 ◽  
Vol 76 (Suppl 1) ◽  
pp. A81.3-A82
Author(s):  
Hyoung-ryoul Kim
Keyword(s):  
Traffic Accidents ◽  
Night Shift ◽  
Working Hours ◽  
Wage Structure ◽  
Working Time ◽  
Caffeine Intake ◽  
Physical And Mental Health ◽  
Caffeine Consumption ◽  
Caffeine Ingestion ◽  
Taxi Drivers

Taxi drivers in Korea are known to work long hours and receive low wages. In addition, there are various forms of working, so that they can work 12 hours a day for 2 shifts, work only at night or day time, and drive a car whole day alone (14–15 hours a day). We surveyed their specific hours of work, and smoking and caffeine consumption. In this study, 11 business sites were selected for taxi companies in Seoul considering region and workplace size, and survey was conducted for all taxi drivers belonging to the relevant business sites. The questionnaire consisted of demographic characteristics, working hours and working conditions, violence experience, emotional labor status, physical and mental health status, sleep health, traffic accidents and traffic violation experience. A total of 698 respondents (39.6%) answered the questionnaire. 76.2% were working 25–26 days a month. 49.2% of the workers worked more than 60 hours per week and less than 70 hours per week. 52.8% of drivers were current smokers, and 65.9% of those who work fixed night shift were current smokers. The rate of taking caffeinated beverages was 90.4%, of which 75.5% were taking six or more cups a day. In the form of working for 14–15 hours a day alone and working in fixed night shift, more than 6 cups were consumed.Taxi drivers are forced to work long hours on their own due to their low wage structure, and the frequency of smoking and caffeine ingestion is very high in order to maintain long working hours. In order to improve this situation, the introduction of the monthly salary system and regulation of working time should be applied.

Loaded Inter-set Stretching for Muscular Adaptations in Trained Males: Is the Hype Real?

2021 ◽  
Author(s):  
Tanuj Wadhi ◽  
Christopher Barakat ◽  
Alexandre L. Evangelista ◽  
Jeremy R. Pearson ◽  
Ashmeet S. Anand ◽  
...  
Keyword(s):  
Bench Press ◽  
Rest Period ◽  
Muscle Thickness ◽  
Time Effect ◽  
Repetition Maximum ◽  
Volume Load ◽  
Rest Periods ◽  
Traditional Resistance Training ◽  
Muscular Adaptations ◽  
Repetitions To Failure

AbstractThe study examined the effects of adding a loaded stretch in the inter-set rest period (ISS) compared to traditional resistance training (TR) on muscular adaptations in resistance-trained males. Twenty-six subjects were randomly assigned into two groups (ISS: n=12; TR: n=14) and underwent an 8-week training regimen. Subjects in ISS underwent an additional loaded stretch for 30 s at 15% of their working load from the prior set during the inter-set rest periods. Muscle thickness of the pectoralis major at the belly (BMT) and lateral (LMT) portions, One-repetition maximum (1RM) and repetitions-to-failure (RTF) on the bench press exercise were measured at baseline and post 8 weeks of training. Additionally, volume load and perceptual parameters for exertion and recovery were measured. Both groups had similar total volume load and average perceptual parameters (p>0.05). There was a main time effect (p<0.01) for all but one dependent variable indicating that both groups responded similarly across time [(∆BMT: ISS=2.7±1.7 mm; TR = 3.0±2.2 mm), (∆LMT: ISS=3.2±1.6 mm; TR=2.8±1.7 mm, (∆1RM: ISS=6.6±3.8 kg; TR=7.5±5.7 kg). Repetitions-to-failure did not change in either group (∆RTF: ISS=0.0±2.1 repetitions; TR=0.0±2.3 repetitions, p>0.05). Our results suggest that addition of a loaded ISS does not affect muscular adaptations either positively or negatively in resistance-trained males.

scholarly journals Effects of chronic caffeine consumption on sleep and the sleep electroencephalogram in mice

2018 ◽  
Vol 33 (1) ◽  
pp. 122-131 ◽  
Author(s):  
Maria Panagiotou ◽  
Mandy Meijer ◽  
Johanna H Meijer ◽  
Tom Deboer
Keyword(s):  
Sleep Deprivation ◽  
Chronic Condition ◽  
Daily Basis ◽  
Light Period ◽  
Caffeine Intake ◽  
Rapid Eye Movement Sleep ◽  
Caffeine Consumption ◽  
Chronic Caffeine ◽  
Circadian Physiology ◽  
The Impact

Background: Caffeine is one of the most widely consumed psychostimulants, and it impacts sleep and circadian physiology. Aim: Caffeine is generally used chronically on a daily basis. Therefore, in the current study, we investigated the chronic effect of caffeine on sleep in mice. Methods: We recorded the electroencephalogram and electromyogram on a control day, on the first day of caffeine consumption (acute), and following two weeks of continuous caffeine consumption (chronic). In the latter condition, a period of six-hour sleep deprivation was conducted during the light period. Control mice, which received normal drinking water, were also recorded and sleep deprived. Results: We found that caffeine induced differential effects following acute and chronic consumption. Over 24 h, waking increased following acute caffeine whereas no changes were found in the chronic condition. The daily amplitude of sleep–wake states increased in both acute and chronic conditions, with the highest amplitude in the chronic condition, showing an increase in sleep during the light and an increase in waking during the dark. Furthermore, electroencephalogram slow-wave-activity in non-rapid eye-movement sleep was increased, compared with both control conditions, during the first half of the light period in the chronic condition. It was particularly challenging to keep the animals awake during the sleep deprivation period under chronic caffeine. Conclusions: Together the data suggest an increased sleep pressure under chronic caffeine. In contrast to the traditional conception on the impact on sleep, chronic caffeine intake seems to increase the daily sleep–wake cycle amplitude and increase sleep pressure in mice.

Consumption of dietary caffeine and coffee in physically active populations: physiological interactions

2008 ◽  
Vol 33 (6) ◽  
pp. 1301-1310 ◽  
Author(s):  
Jasmine M. Tunnicliffe ◽  
Kelly Anne Erdman ◽  
Raylene A. Reimer ◽  
Victor Lun ◽  
Jane Shearer
Keyword(s):  
Performance Enhancement ◽  
Weight Maintenance ◽  
Daily Intake ◽  
Biologically Active ◽  
Caffeine Intake ◽  
Caffeine Consumption ◽  
Caffeine Ingestion ◽  
Winter Sports ◽  
Physically Active ◽  
High Level

Caffeine is a proven ergogenic aid, increasing athletic performance, endurance, and mental chronometry at doses as low as 1–3 mg·kg–1. As coffee is a readily available and commonly ingested form of caffeine, the two are often equated. However, coffee also contains hundreds of other biologically active compounds, many of which are metabolically distinct from caffeine. The purpose of this review was to examine the prevalence of coffee and (or) caffeine consumption among elite Canadian athletes, and to delineate the effects of coffee and caffeine on physical activity, weight maintenance, performance, and metabolism. A total of 270 self-reported 3-day food records were examined for caffeine intake from athletes registered with Canadian Sport Centres in 2005 and 2006. Athletes ranged in age from 16–45 years, and competed in 38 different sports. Results showed that 30% of athletes ingested >1 mg·kg–1·day–1 from a variety of sources. Average daily intake was 0.85 ± 13 mg·kg–1. Caffeine intake was not correlated with any 1 sport; the 10 highest caffeine users were athletes from 9 different sports, including skill, endurance, and power sports. No differences were noted for average caffeine ingestion between summer and winter sports. High caffeine intakes corresponded to coffee ingestion, with the 25 highest individual intakes (193–895 mg·day–1) from coffee drinkers. In summary, it can be concluded that the majority of high-level Canadian athletes consume dietary caffeine primarily in the form of coffee. However, levels consumed are insufficient to elicit performance enhancement. Potential detrimental effects of caffeine consumption on exercise performance include gastric upset, withdrawal, sleep disturbance, and interactions with other dietary supplements.

scholarly journals Acute Effects of a Percussive Massage Treatment on Movement Velocity during Resistance Training

2021 ◽  
Vol 18 (15) ◽  
pp. 7726
Author(s):  
Manuel García-Sillero ◽  
Jose Manuel Jurado-Castro ◽  
Javier Benítez-Porres ◽  
Salvador Vargas-Molina
Keyword(s):  
Resistance Training ◽  
Bench Press ◽  
Therapy Group ◽  
Control Group ◽  
Acute Effects ◽  
Movement Velocity ◽  
Repetition Maximum ◽  
Rest Periods ◽  
Massage Treatment ◽  
Male University Students

The aim of this research was to verify whether the application of percussion therapy during inter-set rest periods increases the number of repetitions performed before reaching a 30% velocity loss threshold during a bench press exercise. Methods: Twenty-four male university students participated in this study (24.3 ± 1.3 years; 77.5 ± 8.3 kg; 177.0 ± 5.6 cm; 24.7 ± 2.6 kg∙m−2). Participants were randomized into two groups: a percussion therapy group (PTG) and a control group (CG). They performed 4 sets at 70% of a one-repetition maximum before reaching a 30% velocity loss threshold with an inter-set recovery of 3 min. Results: The PTG performed a greater total number of repetitions compared to the CG (44.6 ± 4.8 vs. 39.5 ± 6.8; p = 0.047; ES = 0.867). No differences were observed for the different movement velocity variables and fatigue control (p > 0.05). Conclusions: Percussion therapy is an effective method to delay the loss of movement velocity in the bench press exercise.

Effect of Acute and Chronic Caffeine Use on the Cerebrovascular, Cardiovascular and Hormonal Responses to Orthostasis in Healthy Volunteers

1995 ◽  
Vol 89 (5) ◽  
pp. 475-480 ◽  
Author(s):  
Kwasi Debrah ◽  
Rob Haigh ◽  
Robert Sherwin ◽  
June Murphy ◽  
David Kerr
Keyword(s):  
Heart Rate ◽  
Mean Arterial Pressure ◽  
Arterial Pressure ◽  
Healthy Volunteers ◽  
Peripheral Tolerance ◽  
Caffeine Intake ◽  
Acute Effects ◽  
Caffeine Ingestion ◽  
Hormone Levels ◽  
Chronic Caffeine

1. The effects of acute and chronic caffeine ingestion on supine- and tilt- (60 min at 70°) induced changes in middle cerebral artery velocity (Vmca), heart rate, blood pressure and counter-regulatory hormone levels (catecholamines, growth hormone and cortisol) were studied in nine healthy volunteers. A double-blind, placebo-controlled design was used to study acute effects followed by an open study after 6 days of chronic caffeine use. 2. In the supine position, acute ingestion of caffeine (250 mg) was associated with a fall in Vmca [−11 cm/s, point estimate of difference versus placebo (95% confidence interval: −17, −6) cm/s, P < 0.001] and a rise in mean arterial pressure [+4 (1, 6) mmHg, P < 0.01] and plasma adrenaline levels [+138 (53, 223) pmol/l, P < 0.01]. After chronic caffeine use, the pressor and adrenaline responses, but not the drop in Vmca, were significantly attenuated. 3. On tilting to 70° the fall in Vmca was greater with placebo than after acute caffeine ingestion [−10 (−14, −15) cm/s, P < 0.01], whereas increments (above supine values) in heart rate, mean arterial pressure and hormone levels were unchanged by caffeine. In contrast, the adrenaline [+126 (29, 282) pmol/l, P < 0.01] and noradrenaline [+ 0.6 (0.1, 0.9) nmol/l, P < 0.05] responses to tilting were augmented after acute caffeine ingestion. Chronic caffeine supplementation did not alter the fall in Vmca associated with tilting, but significantly attenuated the adrenaline response (P < 0.01 compared with the acute study). 4. Acute caffeine ingestion and orthostasis are both associated with a reduction in Vmca and a rise in mean arterial pressure and adrenaline levels. The acute effects of caffeine on mean arterial pressure and adrenaline but not on Vmca are lost with sustained caffeine intake. These results suggest dissociation between the development of central and peripheral tolerance after chronic caffeine use.

Effects of Maternal Smoking and Caffeine Habits on Infantile Apnea: A Retrospective Study

PEDIATRICS ◽  
1986 ◽  
Vol 78 (1) ◽  
pp. 159-163
Author(s):  
Paul L. Toubas ◽  
James C. Duke ◽  
Mary Anne McCaffree ◽  
Cynthia D. Mattice ◽  
Debra Bendell ◽  
...  
Keyword(s):  
Maternal Smoking ◽  
Linear Regression Analysis ◽  
Smoking Habit ◽  
Multiple Linear Regression Analysis ◽  
Caffeine Intake ◽  
Central Apnea ◽  
Caffeine Consumption ◽  
Caffeine Ingestion ◽  
Obstructive Apnea ◽  
History Of

To evaluate the relationship of antecedent maternal smoking and caffeine consumption habits on the occurrence of apnea in their offspring, rates for central and obstructive apnea were analyzed in a cohort of mother-infant pairs. The mothers of 298 infants with apnea responded to a questionnaire completed prior to a nine-hour polysomnogram performed as part of the patients' evaluations. Cigarette consumption estimates were computed on a 20-cigarette per pack basis, and caffeine intake, based on dietary sources (coffee, tea, chocolate, and colas), was summarized as milligrams of caffeine consumed per day. Rates of central and obstructive apnea of 6 to 10 seconds in duration were calculated. Multiple linear regression analysis determined that smokers tended to be younger and have lower birth weight infants who presented earlier with apnea than infants of nonsmokers. Increased rates of central apnea occurred in infants of smokers as compared with infants of nonsmokers. During pregnancy, a pack per day increase in maternal smoking habit was associated with a 1.88/h increase in central apneas in their offspring (P &lt;.01). Maternal smoking after delivery had a similar relationship. Obstructive apnea rates were similar in both groups. Both central and obstructive apnea rates associated positively with increasing maternal caffeine consumption. Smoking habits and caffeine ingestion were correlated (P &lt; .01). Infants with apnea have greater rates of central apnea when their mothers smoke during pregnancy. Therefore, a history of nicotine consumption should be included in the medical history of infants presenting with apnea.

scholarly journals “The path is smooth that leadeth on to danger”: caffeine and psychosis

BJPsych Open ◽  
2021 ◽  
Vol 7 (S1) ◽  
pp. S187-S187
Author(s):  
Isabel Ganhao ◽  
Goncalo Marinho ◽  
Afonso Paixa ◽  
Miguel Trigo
Keyword(s):  
Mental Illness ◽  
Serious Mental Illness ◽  
Treatment Resistance ◽  
Review Literature ◽  
Psychotic Symptoms ◽  
Caffeine Intake ◽  
Negative Effects ◽  
Caffeine Consumption ◽  
Adenosine Antagonist ◽  
Schizophrenic Patients

AimsTo review literature on the importance of caffeine intake with regard to psychosis. The need for intervention with regard to caffeine intake hinges on effectively recognizing potential risks.BackgroundCaffeine is the most widely consumed psychoactive substance worldwide and as such is generally considered acceptable but as a competitive adenosine antagonist, it affects dopamine transmission. Patients with serious mental illness are known to have higher caffeine intakes than the general population. The hierarchy of needs for this patient population is complex, frequently leaving the intake of caffeine under the radar of clinical priorities.MethodPubMed and Google Scholar search for caffeine/coffee and psychosis/schizophreniaResultOf the 43 articles that were considered relevant for clinical practice, caffeine consumption was associated with 1) appearance of psychotic symptoms and episodes (caffeine-induced psychosis) and chronic psychosis in high intake 2) exacerbation of psychosis in schizophrenic patients even in lower intakes, 3) treatment resistance possibly due to interference with antipsychotics (ex. clozapine), 4) abuse and addiction, 5) comorbidity with tobacco smoking and other addictions. Caffeine in low doses was associated with ameliorating cognitive and extrapyramidal side-effects of medication and as a potential treatment strategy for treatment-resistant schizophrenia.ConclusionCaffeine consumption may have a greater impact on psychotic symptoms and episodes than is recognized with negative effects outweighing any potential benefits. Greater awareness of the necessity to quantify caffeine intake and implementation of interventions to curb intake may contribute to better quality of care of serious mental illness. Further research is warranted.

scholarly journals Panic Disorder and Chronic Caffeine Use: A Case-control Study

2019 ◽  
Vol 15 (1) ◽  
pp. 120-125
Author(s):  
Veruska Andrea Santos ◽  
Silvia Hoirisch-Clapauch ◽  
Antonio E. Nardi ◽  
Rafael Christophe Freire
Keyword(s):  
Panic Disorder ◽  
Clinical Features ◽  
Panic Attacks ◽  
Caffeine Intake ◽  
Acute Administration ◽  
Caffeine Consumption ◽  
Harmful Use ◽  
Chronic Caffeine ◽  
High Doses ◽  
Control Study

Background: Acute administration of caffeine produces panic attacks in most Panic Disorder (PD) patients, but little is known about chronic caffeine use in these patients. Objective: To assess caffeine use in patients with PD and to ascertain if caffeine consumption is associated with sociodemographic or clinical features. Methods: 65 adults with PD and 66 healthy controls were included in the current study. Their caffeine intake within the previous week was quantified with a questionnaire and compared. Harmful caffeine use was defined as consumption above 400 mg/day of caffeine. We tested for correlations between caffeine intake, demographic and clinical features. Results: Patients consumed significantly more caffeine than controls (P < 0.001). 14% (N = 9) of the PD patients made harmful use of caffeine. The use of caffeine-containing medications was observed in 40% (N = 26) of the PD patients and 6% (N = 4) of controls. Consumption of energy drinks was observed in 11% (N = 7) of PD patients and in none of the healthy subjects. Patients reported sleeping significantly less than controls (P < 0.001). In PD patients, caffeine consumption was not correlated with the presence of panic attacks or comorbidity with depression. The use of benzodiazepines or sedative medications was not correlated with caffeine intake. Conclusion: High caffeine consumption in PD patients could be explained by the development of tolerance with regular use of this substance. Subtypes of sensitive and non-sensitive PD patients could also explain why some of these patients are able to tolerate high doses of caffeine.

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