Publications by authors named "L I DI GUGLIELMO"
Effects of Caffeine Ingestion on Pulmonary V˙O2 Kinetics and Muscle Fatigue During Severe-Intensity Cycling Exercise.
Int J Sport Nutr Exerc Metab
November 2024
Introduction: This study aimed to analyze the effect of caffeine (CAF) intake on pulmonary oxygen uptake (V˙O2) kinetics, muscle fatigue, and physiological and perceptual parameters during severe-intensity cycling exercise.
Methods: Twelve physically active men (age: 26 ± 5 years; V˙O2peak: 46.7 ± 7.
The effect of caffeine chewing gum on muscle performance and fatigue after severe-intensity exercise: isometric vs. dynamic assessments in trained cyclists.
Eur J Appl Physiol
September 2024
Article Synopsis
- * Fifteen cyclists performed four testing sessions with two cycling bouts each, using either caffeinated gum or placebo in a double-blind setup, but showed no significant difference in performance between the two types of gum after exercise.
- * Results indicated that caffeinated gum did not effectively reduce muscle force decline, and moderate correlations suggested caution in linking isometric force measurements directly to fatigue in dynamic activities.
No Combined Effect of Caffeinated Chewing Gum and Priming Exercise on Oxygen Uptake and Muscle Near-Infrared Spectroscopy-Derived Kinetics: A Double-Blind Randomized Crossover Placebo-Controlled Trial in Cyclists.
Int J Sport Nutr Exerc Metab
November 2024
This study aimed to investigate the effects of caffeine ingestion by chewing gum (GUMCAF) combined with priming exercise on pulmonary oxygen uptake (V˙O2) and near-infrared spectroscopy-derived muscle oxygen extraction (HHb + Mb) kinetics during cycling performed in a severe-intensity domain. Fifteen trained cyclists completed four visits: two under a placebo gum (GUMPLA) and two under GUMCAF ingestion. Each visit consisted of two square-wave cycling bouts at Δ70 intensity (70% of difference between the V˙O2 at first ventilatory threshold and V˙O2max) with duration of 6 min each and 5 min of passive rest between the bouts.
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- This study assessed the impact of adding supramaximal intermittent shuttle-run training (ISRT) to regular soccer preseason training on aerobic performance and sprint speed in junior male soccer players.
- The experimental group (EG) that performed ISRT alongside regular training showed significantly greater improvements in lactate minimum speed and peak speed compared to the control group (CG) that only followed the standard training regimen.
- Both groups improved their flying 20-m sprint speed, but the control group experienced a small decrease in 10-m sprint speed, while the experimental group maintained their performance, indicating that ISRT can effectively enhance players' endurance and sprint capacity without hindering their acceleration.
Reliability and Validity of Cycling Sprint Performance at Isolinear Mode Without Torque Factor: A Preliminary Study in Well-Trained Male Cyclists.
Res Q Exerc Sport
September 2024
Article Synopsis
- - This study compared cycling performance using two sprint modes: isolinear (ISO) and isovelocity (ISO), with 20 trained male cyclists completing multiple short sprints on a specialized ergometer.
- - Results showed that while torque (T) was significantly greater in the ISO mode, maximum cadence (C) was higher in the other ISO mode, with both modes yielding similar power outputs (P) and optimal cadence power (OPT).
- - The findings suggest that a single test in ISO mode is effective for assessing muscle fatigue during cycling, demonstrating good consistency and acceptable variability in results.