Gymnastik- och idrottshögskolan, GIH

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Development of Maximal Dynamic Strength During Concurrent Resistance and Endurance Training in Untrained, Moderately Trained, and Trained Individuals: A Systematic Review and Meta-analysis.
Swedish School of Sport and Health Sciences, GIH, Department of Physiology, Nutrition and Biomechanics.ORCID iD: 0000-0001-8767-5235
Swedish School of Sport and Health Sciences, GIH, Department of Physical Activity and Health.ORCID iD: 0000-0001-7335-3796
Swedish School of Sport and Health Sciences, GIH, Department of Physiology, Nutrition and Biomechanics.ORCID iD: 0000-0001-8161-5610
Swedish School of Sport and Health Sciences, GIH, Department of Physiology, Nutrition and Biomechanics.ORCID iD: 0000-0003-1848-5491
2021 (English)In: Sports Medicine, ISSN 0112-1642, E-ISSN 1179-2035, Vol. 51, no 5, p. 991-1010Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: The effect of concurrent training on the development of maximal strength is unclear, especially in individuals with different training statuses.

OBJECTIVE: The aim of this systematic review and meta-analysis study was to compare the effect of concurrent resistance and endurance training with that of resistance training only on the development of maximal dynamic strength in untrained, moderately trained, and trained individuals.

METHODS: On the basis of the predetermined criteria, 27 studies that compared effects between concurrent and resistance training only on lower-body 1-repetition maximum (1RM) strength were included. The effect size (ES), calculated as the standardised difference in mean, was extracted from each study, pooled, and analysed with a random-effects model.

RESULTS: The 1RM for leg press and squat exercises was negatively affected by concurrent training in trained individuals (ES =  - 0.35, p < 0.01), but not in moderately trained ( - 0.20, p = 0.08) or untrained individuals (ES = 0.03, p = 0.87) as compared to resistance training only. A subgroup analysis revealed that the negative effect observed in trained individuals occurred only when resistance and endurance training were conducted within the same training session (ES same session =  - 0.66, p < 0.01 vs. ES different sessions =  - 0.10, p = 0.55).

CONCLUSION: This study demonstrated the novel and quantifiable effects of training status on lower-body strength development and shows that the addition of endurance training to a resistance training programme may have a negative impact on lower-body strength development in trained, but not in moderately trained or untrained individuals. This impairment seems to be more pronounced when training is performed within the same session than in different sessions. Trained individuals should therefore consider separating endurance from resistance training during periods where the development of dynamic maximal strength is prioritised.

Place, publisher, year, edition, pages
Springer, 2021. Vol. 51, no 5, p. 991-1010
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
URN: urn:nbn:se:gih:diva-6626DOI: 10.1007/s40279-021-01426-9ISI: 000631473500001PubMedID: 33751469OAI: oai:DiVA.org:gih-6626DiVA, id: diva2:1541664
Available from: 2021-04-01 Created: 2021-04-01 Last updated: 2024-03-15
In thesis
1. Concurrent training for elite team sport athletes
Open this publication in new window or tab >>Concurrent training for elite team sport athletes
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Most team sports consist of elements that require both a high level of strength and aerobic endurance. Because of these demands a combination of resistance and endurance training (concurrent training) is an integrated part of their weekly training program. Concurrent training can be defined as the implementation of resistance and endurance training in parallel within the same training program to develop both capacities simultaneously. Despite the wide range of benefits of concurrent training, there is evidence that adding endurance training to a resistance training protocol can compromise strength development. The underlying cause has recently started to be clarified, with substantial evidence suggesting that the design of the training program and inter-individual differences play a crucial role in determining the effect of concurrent training on strength performance. It has been suggested that the training status may have an independent influence on the results during concurrent training. Thus, it is important to acknowledge that the scientific literature on concurrent training for elite team sport athletes is very scarce, especially in females. The primary aim of this thesis was therefore to investigate the effect of concurrent training on elite team sport athletes with both sexes represented. This was done by performing one systematic review with meta-analysis and three experimental studies.

Study I is a review study addressing the effect of training status on strength development during concurrent training and the effect of same-session and different sessions of concurrent training. The result from this study suggests that adding endurance training to a resistance training protocol impairs lower-body maximal dynamic strength development in trained individuals but not in moderately trained or untrained. The data also show that the impairment appears to increase if concurrent training is performed within the same session. Given these findings, the focus of study II was to investigate the impact of intrasession exercise order during same-session concurrent training in elite team sport athletes. In this study, we show that high-intensity interval training before resistance training reduces power output during resistance training but does not impair maximal strength or power development during a 7-week training intervention. The focus of study III was to examine the reliability of isometric leg press and countermovement jump, two commonly used measurements when assessing strength- and power-related variables in elite team sport athletes. In this study, we demonstrate that isometric leg press and countermovement jump are highly reliable measurements when examining strength- and power-related variables.

The findings from study II showed that a reduction in resistance training performance (power output) during same-session concurrent training was visible only when high-intensity interval training was performed before resistance training (study II). The focus of study IV was therefore to investigate the effect of different recovery periods following high-intensity interval training on strength and explosive performance during a power training session in elite team sport athletes. Since isometric leg press and countermovement jump were shown in study III to be highly reliable measurements when assessing strength- and power-related variables in elite team sport athletes, these measurements were used in study IV. In study IV, we demonstrated that high-intensity interval training 10 min prior to power training impairs strength and explosive performance. However, the impairment was no longer present 6 and 24 hours after high-intensity interval training.

In conclusion, the present thesis shows that trained individuals are sensitive to concurrent training, and that adding high-intensity interval training prior to resistance training compromises strength and explosive performance during the resistance training session in elite team sport athletes. However, the reduction in training performance does not seem to translate to reduced strength or power development during shorter training periods (<7-weeks). The findings from the present thesis also show that the reduction in training performance can be reduced by performing the resistance training session first or by allowing at least a 6-hour recovery period between sessions. The findings from this thesis provide a foundation for an evidence-based approach when organizing training to enhance performance in elite team sport athletes, and for future work to further examine the effect of concurrent training on this population.

Place, publisher, year, edition, pages
Stockholm: Gymnastik- och idrottshögskolan, GIH, 2024. p. 84 s.
Series
Avhandlingsserie för Gymnastik- och idrottshögskolan ; 34
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-8151 (URN)978-91-988127-5-6 (ISBN)
Public defence
2024-04-12, Aulan, Stockholm, 09:00 (English)
Opponent
Supervisors
Available from: 2024-03-15 Created: 2024-03-15 Last updated: 2024-04-19Bibliographically approved

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Petré, HenrikHemmingsson, ErikRosdahl, HansPsilander, Niklas

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