Effects of caffeine supplementation on muscle endurance, maximum strength, and perceived exertion in adults submitted to strength training: a systematic review and meta-analyses

Abstract Several studies have used transcranial magnetic stimulation to probe the corticospinal-motoneuronal responses to a single session of strength training; however, the findings are inconsistent. This systematic review and meta-analysis examined whether a single bout of strength training affects the excitability and inhibition of intracortical circuits of the primary motor cortex (M1) and the corticospinal-motoneuronal pathway. A systematic review was completed, tracking studies between January 1990 and May 2018. The methodological quality of studies was determined using the Downs and Black quality index. Data were synthesised and interpreted from meta-analysis. Nine studies (n=107) investigating the acute corticospinal-motoneuronal responses to strength training met the inclusion criteria. Meta-analyses detected that after strength training compared to control, corticospinal excitability [standardised mean difference (SMD), 1.26; 95% confidence interval (CI), 0.88, 1.63; p<0.0001] and intracortical facilitation (ICF) (SMD, 1.60; 95% CI, 0.18, 3.02; p=0.003) were increased. The duration of the corticospinal silent period was reduced (SMD, −17.57; 95% CI, −21.12, −14.01; p=0.00001), but strength training had no effect on the excitability of the intracortical inhibitory circuits [short-interval intracortical inhibition (SICI) SMD, 1.01; 95% CI, −1.67, 3.69; p=0.46; long-interval intracortical inhibition (LICI) SMD, 0.50; 95% CI, −1.13, 2.13; p=0.55]. Strength training increased the excitability of corticospinal axons (SMD, 4.47; 95% CI, 3.45, 5.49; p<0.0001). This systematic review and meta-analyses revealed that the acute neural changes to strength training involve subtle changes along the entire neuroaxis from the M1 to the spinal cord. These findings suggest that strength training is a clinically useful tool to modulate intracortical circuits involved in motor control.

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Comparing clinical outcomes of exercise intervetions according to the American college of sports medicine guidelines for strength training to other types of exercise in knee osteoarthritis: a systematic review and meta-analyses

Osteoarthritis and Cartilage ◽

10.1016/j.joca.2016.01.887 ◽

2016 ◽

Vol 24 ◽

pp. S483-S484 ◽

Cited By ~ 1

Author(s):

C. Bartholdy ◽

C. Juhl ◽

R. Christensen ◽

H. Lund ◽

W. Zhang ◽

...

Keyword(s):

Systematic Review ◽

Knee Osteoarthritis ◽

Strength Training ◽

Clinical Outcomes ◽

Sports Medicine ◽

Meta Analyses

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Effects of Caffeine Supplementation on Physical Performance of Soccer Players: Systematic Review and Meta-Analysis

Sports Health A Multidisciplinary Approach ◽

10.1177/1941738121998712 ◽

2021 ◽

pp. 194173812199871

Author(s):

Raphael Einsfeld Simões Ferreira ◽

Rafael Leite Pacheco ◽

Carolina de Oliveira Cruz Latorraca ◽

Rachel Riera ◽

Ricardo Guilherme Eid ◽

...

Keyword(s):

Systematic Review ◽

Methodological Quality ◽

Perceived Exertion ◽

Randomized Clinical Trials ◽

Data Extraction ◽

Meta Analysis ◽

Risk Of Bias ◽

Rating Of Perceived Exertion ◽

Soccer Players ◽

Meta Analyses

Context: Caffeine is 1 of the most popular supplements consumed by athletes, and the evidence for improving soccer performance remains limited. Objective: To investigate and update the effects (benefits and harms) of caffeine to improve performance on soccer players. Data Sources: Electronic search in Medline (via PubMed), CENTRAL, Embase, SPORTDiscus, and LILACS, from inception to March 28, 2020. Study Selection: Randomized clinical trials (RCTs) assessing the effects of caffeine on the performance of soccer players. Study Design: Systematic review with meta-analysis. Level of Evidence: Level 1. Data Extraction: Data extraction was conducted independently by 2 authors using a piloted form. We assessed methodological quality (Cochrane risk-of-bias [RoB] table) and the certainty of the evidence (GRADE [Grading of Recommendations Assessment, Development and Evaluation] approach). Results: Sixteen RCTs were included. Overall methodological quality was classified as unclear to low risk of bias. When assessing aerobic endurance, meta-analyses did not demonstrate the differences between caffeine and placebo (mean difference [MD], 44.9 m; 95% confidence interval [CI], −77.7 to 167.6). Similarly, no difference was observed during time to fatigue test (MD, 169.8 seconds; 95% CI, −71.8 to 411.6). Considering anaerobic power, meta-analyses also did not find differences for vertical jump (MD, 1.01 cm; 95% CI, −0.68 to 2.69) and repeated sprint tests (MD, −0.02 seconds; 95% CI, −0.09 to 0.04), as well as reaction time agility test (MD, 0.02 seconds; 95% CI, −0.01 to 0.04) and rating of perceived exertion (MD, 0.16 points; 95% CI, −0.55 to 0.87). Regarding safety, a few minor adverse events were reported. Based on the GRADE approach, the certainty of this evidence was classified as very low to low. Conclusions: We found no significant improvement in soccer-related performance with caffeine compared with placebo or no intervention. However, caffeine appears to be safe.

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Reference Values for External and Internal Training Intensity Monitoring in Young Male Soccer Players: A Systematic Review

Healthcare ◽

10.3390/healthcare9111567 ◽

2021 ◽

Vol 9 (11) ◽

pp. 1567

Author(s):

Rafael Oliveira ◽

João Paulo Brito ◽

Adrián Moreno-Villanueva ◽

Matilde Nalha ◽

Markel Rico-González ◽

...

Keyword(s):

Systematic Review ◽

Reference Values ◽

Perceived Exertion ◽

Management Strategies ◽

Young Male ◽

Daily Practice ◽

Soccer Players ◽

General Tendency ◽

Training Intensity ◽

Meta Analyses

Training intensity monitoring is a daily practice in soccer which allows soccer academies to assess the efficacy of its developmental interventions and management strategies. The current systematic review’s purpose is to: (1) identify and summarize studies that have examined external and internal training intensity monitoring, and to (2) provide references values for the main measures for young male soccer players. A systematic review of EBSCO, PubMed, Scielo, Scopus, SPORTDiscus, and Web of Science databases was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. From the 2404 studies initially identified, 8 were fully reviewed, and their outcome measures were extracted and analyzed. From them, the following range intervals were found for training: rated perceived exertion (RPE) 2.3–6.3 au; session-RPE, 156–394 au; total distance, 3964.5–6500 m and; distance >18 km/h, 11.8–250 m. Additionally, a general tendency to decrease the intensity in the day before the match was Found. This study allowed to provide reference values of professional young male players for the main internal and external measures. All together, they can be used by coaches, their staff, or practitioners in order to better adjust training intensity.

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Psychological and Cognitive Aspects of Borderline Intellectual Functioning

European Psychologist ◽

10.1027/1016-9040/a000293 ◽

2017 ◽

Vol 22 (3) ◽

pp. 159-166 ◽

Cited By ~ 2

Author(s):

Bastianina Contena ◽

Stefano Taddei

Keyword(s):

Quality Of Life ◽

Systematic Review ◽

Intellectual Functioning ◽

Clinical Impact ◽

Review Of The Literature ◽

Borderline Intellectual Functioning ◽

General Quality ◽

Meta Analyses ◽

Over Time

Abstract. Borderline Intellectual Functioning (BIF) refers to a global IQ ranging from 71 to 84, and it represents a condition of clinical attention for its association with other disorders and its influence on the outcomes of treatments and, in general, quality of life and adaptation. Furthermore, its definition has changed over time causing a relevant clinical impact. For this reason, a systematic review of the literature on this topic can promote an understanding of what has been studied, and can differentiate what is currently attributable to BIF from that which cannot be associated with this kind of intellectual functioning. Using Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) criteria, we have conducted a review of the literature about BIF. The results suggest that this condition is still associated with mental retardation, and only a few studies have focused specifically on this condition.

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