Trial reportEuropean journal of applied physiology2004
Strength training effects on physical performance and serum hormones in young soccer players.
Trial report in European journal of applied physiology, 2004. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 35 papers, 6 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
35 citing papers in PubMed, 6 syntheses or guidelines pooled it.
- The optimal dose of strength and conditioning training for enhancing physical performance in football players: a systematic review and network meta-analysis of randomized clinical trials.Frontiers in physiology · 2026Pooled it
- Effects of Resistance and Endurance Training Alone or Combined on Hormonal Adaptations and Cytokines in Healthy Children and Adolescents: A Systematic Review and Meta-analysis.Sports medicine - open · 2022Pooled it
- Hematology, Hormones, Inflammation, and Muscle Damage in Elite and Professional Soccer Players: A Systematic Review with Implications for Exercise.Sports medicine (Auckland, N.Z.) · 2021Pooled it
- The Training of Short Distance Sprint Performance in Football Code Athletes: A Systematic Review and Meta-Analysis.Sports medicine (Auckland, N.Z.) · 2021Pooled it
- Pooled it
- Effects and dose-response relationships of resistance training on physical performance in youth athletes: a systematic review and meta-analysis.British journal of sports medicine · 2016Pooled it
- Long-Term Effects of NASM-OPT Periodized Training on Lower-Limb Strength, Explosive Power, and Stretch-Shortening Cycle Function in Adolescent Athletes.Journal of sports science & medicine · 2026Trial
- Immediate Effects of Acupuncture on Explosive Force Production and Stiffness in Male Knee Joint.International journal of environmental research and public health · 2021Trial
- Hormonal Adaptations in Professional Soccer Players: Ethnic Differences and Pathophysiological Mechanisms.International journal of molecular sciences · 2026Review
- Velocity and Acceleration-Based Differential Plyometric Training Effects on Young Basketball Players.Journal of human kinetics · 2025Article
- The Effects of Combined Versus Single-Mode Resistance and Repeated Sprint Training on Physical Fitness, Hematological Parameters, and Plasma Volume Variations in Highly Trained Soccer Players.Sports (Basel, Switzerland) · 2024Article
- Effects of a Preseason Neuromuscular Training Program vs. an Endurance-Dominated Program on Physical Fitness and Injury Prevention in Female Soccer Players.Sports medicine - open · 2024Article
- Association between Sprint and Jump Performance and Maximum Strength in Standing Calf Raise or Squat in Elite Youth Soccer Players.Sports (Basel, Switzerland) · 2024Article
- The effect of action observation and motor imagery on jumping and perceived performance.Frontiers in psychology · 2024Article
- Effects of a neuromuscular training program on physical performance and asymmetries in female soccer.Frontiers in physiology · 2023Article
- Relationships between Strength and Step Frequency with Fatigue Index in Repeated Sprint Ability.International journal of environmental research and public health · 2021Article
- Effects of 1 vs. 2 sessions per week of equal-volume sprint training on explosive, high-intensity and endurance-intensive performances in young soccer players.Biology of sport · 2021Article
- The Effect of High-Intensity Interval Training Periods on Morning Serum Testosterone and Cortisol Levels and Physical Fitness in Men Aged 35-40 Years.Journal of clinical medicine · 2021Article
- Article
- The Interplay Between Plasma Hormonal Concentrations, Physical Fitness, Workload and Mood State Changes to Periods of Congested Match Play in Professional Soccer Players.Frontiers in physiology · 2020Article
Corrections and comments
- Erratum issued
Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
To determine the effects of simultaneous explosive strength and soccer training in young men, 8 experimental (S) and 11 control (C) players, aged 17.2 (0.6) years, were tested before and after an 11-week training period with respect to the load-vertical jumping curve [loads of 0-70 kg (counter-movement jump CMJ0-70)], 5- and 15-m sprint performances, submaximal running endurance and basal serum concentrations of testosterone, free testosterone and cortisol. In the S group, the 11-week training resulted in significant increases in the low-force portion of the load-vertical jumping curve (5-14% in CMJ0-30, P<0.01) and in resting serum total testosterone concentrations (7.5%, P<0.05), whereas no changes were observed in sprint running performance, blood lactate during submaximal running, resting serum cortisol and resting serum free testosterone concentrations. In the C group, no changes were observed during the experimental period. In the S group, the changes in CMJ0 correlated ( P<0.05-0.01) with the changes in the 5-m ( r=0.86) and 15-m ( r=0.92) sprints, whereas the changes in CMJ40 correlated negatively with the changes in the testosterone:cortisol ratio ( r=-0.84, -0.92, respectively, P<0.05). These data indicate that young trained soccer players with low initial strength levels can increase explosive strength by adding low-frequency, low-intensity explosive-type strength training. The inverse correlations observed between changes in CMJ40 and changes in the testosterone:cortisol ratio suggest that a transient drop in this ratio below 45% cannot always be interpreted as a sign of overstrain or neuroendocrine dysfunction.
Indexed as
Identifiers
14704801What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.