topicBetaine Exercise Fatigue Randomized Trial
claimComprehensive descriptions of the mechanisms underlying central fatigue can be found in recent reviews (Zhou et al. ).
evidence level4
citationYang Yaqin (2026)
sourceNutritional Interventions and Acupuncture‐Based Strategies for Exercise‐Induced Fatigue and Recovery: Mechanisms and Integrative Perspectives
topicBetaine Exercise Fatigue Randomized Trial
claimIn addition, reduced oxidative phosphorylation capacity, loss of mitochondrial membrane potential, and accumulation of damaged mitochondria compromise ATP supply and exacerbate ROS generation (Powers et al. ; Yu et al. ).
evidence level4
citationYang Yaqin (2026)
sourceNutritional Interventions and Acupuncture‐Based Strategies for Exercise‐Induced Fatigue and Recovery: Mechanisms and Integrative Perspectives
topicBetaine Exercise Fatigue Randomized Trial
claimIn addition, NSAIDs are associated with an increased risk of adverse gastrointestinal, renal, and cardiovascular effects, and with interference with adaptive training responses (Bacchi et al. ).
evidence level4
citationYang Yaqin (2026)
sourceNutritional Interventions and Acupuncture‐Based Strategies for Exercise‐Induced Fatigue and Recovery: Mechanisms and Integrative Perspectives
topicBetaine Exercise Fatigue Randomized Trial
claim2025 2026 2023 2017 2023 Exercise‐induced fatigue (EIF) is a reversible decline in the ability to sustain a given exercise intensity or power output under a defined workload.
evidence level4
citationYang Yaqin (2026)
sourceNutritional Interventions and Acupuncture‐Based Strategies for Exercise‐Induced Fatigue and Recovery: Mechanisms and Integrative Perspectives
topicBetaine Exercise Fatigue Randomized Trial
claimNo trial differences were found for I-FABP (interaction effect, p = 0.076), L: 13 CM ( p = 0.559), the neutrophil/lymphocyte ratio ( p = 0.171), serum cortisol ( p = 0.982), serum myoglobin ( p = 0.942), or serum creatine kinase ( p = 0.694).
evidence level4
citationNieman DC (2025)
sourceBetaine Supplementation Improves 60 km Cycling Time Trial Performance and One-Carbon Metabolism in Cyclists During Recovery.
topicBetaine Exercise Fatigue Randomized Trial
claimConclusions Betaine supplementation modestly improved 60 km cycling performance but had no effect on gut permeability.
evidence level4
citationNieman DC (2025)
sourceBetaine Supplementation Improves 60 km Cycling Time Trial Performance and One-Carbon Metabolism in Cyclists During Recovery.
topicBetaine Exercise Fatigue Randomized Trial
claimBackground/objectives This study examined the effects of 2 weeks of betaine versus placebo supplementation (3 g/d) on 60 km cycling performance, gut permeability, and shifts in plasma metabolites.
evidence level4
citationNieman DC (2025)
sourceBetaine Supplementation Improves 60 km Cycling Time Trial Performance and One-Carbon Metabolism in Cyclists During Recovery.
topicBetaine Exercise Fatigue Randomized Trial
claimA randomized, placebo-controlled, double-blind, crossover design was used with two 2-week supplementation periods and a 2-week washout period.
evidence level4
citationNieman DC (2025)
sourceBetaine Supplementation Improves 60 km Cycling Time Trial Performance and One-Carbon Metabolism in Cyclists During Recovery.