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Staunton CA, Romann M, Björklund G, Born DP. Diving into a pool of data: Using principal component analysis to optimize performance prediction in women's short-course swimming. J Sports Sci 2024; 42:519-526. [PMID: 38704669 DOI: 10.1080/02640414.2024.2346670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 04/17/2024] [Indexed: 05/06/2024]
Abstract
This study aimed to optimise performance prediction in short-course swimming through Principal Component Analyses (PCA) and multiple regression. All women's freestyle races at the European Short-Course Swimming Championships were analysed. Established performance metrics were obtained including start, free-swimming, and turn performance metrics. PCA were conducted to reduce redundant variables, and a multiple linear regression was performed where the criterion was swimming time. A practical tool, the Potential Predictor, was developed from regression equations to facilitate performance prediction. Bland and Altman analyses with 95% limits of agreement (95% LOA) were used to assess agreement between predicted and actual swimming performance. There was a very strong agreement between predicted and actual swimming performance. The mean bias for all race distances was less than 0.1s with wider LOAs for the 800 m (95% LOA -7.6 to + 7.7s) but tighter LOAs for the other races (95% LOAs -0.6 to + 0.6s). Free-Swimming Speed (FSS) and turn performance were identified as Key Performance Indicators (KPIs) in the longer distance races (200 m, 400 m, 800 m). Start performance emerged as a KPI in sprint races (50 m and 100 m). The successful implementation of PCA and multiple regression provides coaches with a valuable tool to uncover individual potential and empowers data-driven decision-making in athlete training.
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Affiliation(s)
- Craig A Staunton
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden
| | - Michael Romann
- Department for Elite Sport, Swiss Federal Institute of Sport, Magglingen, Switzerland
| | - Glenn Björklund
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden
| | - Dennis-Peter Born
- Department for Elite Sport, Swiss Federal Institute of Sport, Magglingen, Switzerland
- Section for High-Performance Sports, Swiss Swimming Federation, Bern, Switzerland
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Raineteau Y, Pla R, Bideau B, Bideau N, Nicolas G. From dry-land to the water: training and testing practices of strength and conditioning coaches in high level French sprint swimmers. Front Sports Act Living 2024; 5:1338856. [PMID: 38283120 PMCID: PMC10811196 DOI: 10.3389/fspor.2023.1338856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Accepted: 12/29/2023] [Indexed: 01/30/2024] Open
Abstract
Introduction The aim of this study was to explore training and testing practices from Strength & Conditioning (S&C) coaches who manage groups of high-level French swimmers in elite training centers. The transfer of abilities from dry-land to in situ condition was also investigated. Methods 24 French S&C coaches completed a survey via an online platform. Frequency analyses were made for quantitative and qualitative responses, the level of significance set for this study was p ≤ 0.05. Results Core stability, Strength & Power were the three most targeted qualities. Core strengthening in all its forms, Bench Press & Squat were the three most prescribed exercises. 79% of S&C coaches adapted exercises according to different parameters. Most of the coaches indicated that dry-land S&C sessions were preferentially placed before in-water sessions. Very varied exercises were used in-water to make the transfer from dry-land more effective. 87% of participants monitored the training load and 38% assessed the force and velocity parameters for some S&C exercises. Discussion Dry-land training practices of S&C coaches were mostly in line with scientific recommendations. In the light of results of the questionnaire, it would appear that testing procedures might be a key issue for transferring qualities from dry-land to in situ.
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Affiliation(s)
- Yannis Raineteau
- M2S Laboratory—Laboratoire Mouvement Sport Santé, Université Rennes 2, Rennes, France
- Optimization Service, Fédération Française de Natation, Clichy, France
| | - Robin Pla
- Optimization Service, Fédération Française de Natation, Clichy, France
| | - Benoit Bideau
- M2S Laboratory—Laboratoire Mouvement Sport Santé, Université Rennes 2, Rennes, France
- MIMETIC-Team, INRIA Rennes Bretagne Atlantique, Rennes, France
| | - Nicolas Bideau
- M2S Laboratory—Laboratoire Mouvement Sport Santé, Université Rennes 2, Rennes, France
- MIMETIC-Team, INRIA Rennes Bretagne Atlantique, Rennes, France
| | - Guillaume Nicolas
- M2S Laboratory—Laboratoire Mouvement Sport Santé, Université Rennes 2, Rennes, France
- MIMETIC-Team, INRIA Rennes Bretagne Atlantique, Rennes, France
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Kierot M, Stendahl M, Warneke K, Wirth K, Konrad A, Brauner T, Keiner M. Maximum strength and power as determinants of on-ice sprint performance in elite U16 to adult ice hockey players. Biol Sport 2024; 41:245-252. [PMID: 38188105 PMCID: PMC10765453 DOI: 10.5114/biolsport.2024.129470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 02/24/2023] [Accepted: 05/19/2023] [Indexed: 01/09/2024] Open
Abstract
In ice hockey, speed strength is one of the major physical key performance indicators, which is significantly influenced by maximum strength. The objective of this study was to evaluate the age-dependent relationship of off-ice maximum strength and vertical jump performance with on-ice linear sprint performance, considering age and performance level. Ninety-one male youth and adult professional ice hockey players (age: 19.3 ± 5.49 years) were recruited and divided into four age groups: under 16, 18, 21 years old and professional elite players (Pro) (i.e., > 21 years). They were tested in maximal isometric strength, squat jump (loaded and unloaded), countermovement jump and on-ice sprint performance (15 m and 30 m linear sprint; 15 m flying linear sprint). Statistical analysis revealed that on-ice sprint performance correlated with isometric strength performance (r = |0.34|-|0.63|) and with off-ice jump performance (r = |0.61|-|0.77|) without an influence of age group or performance level. However, performance differed between age groups and performance level, the largest differences being found between the youngest age group (U16) and the Pro group (g = 0.966-3.281). The present study shows that maximum strength influences on-ice sprint performances in ice hockey players, as well as performance differences between age groups and professional players. Strength and jumping performance should therefore be included in regular performance testing in ice hockey. Since performance differences are observed for almost all strength and speed-strength performances of the youth teams to the Pros, training of these variables is strongly recommended to improve in the transition phase from junior to elite level.
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Affiliation(s)
- Martin Kierot
- Department of Exercise Science, German University of Health & Sport, Ismaning, Germany
- Department of Strength and Conditioning, ZSC/GCK Lions Ice-Hockey, Zürich, Swiss
| | - Mattia Stendahl
- Department of Strength and Conditioning, ZSC/GCK Lions Ice-Hockey, Zürich, Swiss
| | - Konstantin Warneke
- Institute for Exercise, Sport and Health, Leuphana University, Lüneburg, Germany
| | - Klaus Wirth
- Faculty of Training and Sports Science, University of Applied Science Wiener Neustadt, Vienna, Austria
| | - Andreas Konrad
- Institute of Human Movement Science, Sport and Health, University of Graz, Graz, Austria
| | - Torsten Brauner
- Department of Biomechanics, German University of Health & Sport, Ismaning, Germany
| | - Michael Keiner
- Department of Exercise Science, German University of Health & Sport, Ismaning, Germany
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Warneke K, Hillebrecht M, Claassen-Helmers E, Wohlann T, Keiner M, Behm DG. Effects of a Home-Based Stretching Program on Bench Press Maximum Strength and Shoulder Flexibility. J Sports Sci Med 2023; 22:597-604. [PMID: 38045741 PMCID: PMC10690509 DOI: 10.52082/jssm.2023.597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 09/05/2023] [Indexed: 12/05/2023]
Abstract
Recent research showed significant stretch-mediated maximum strength increases when performing stretching between 5 to 120 minutes per day with the calf muscle. However, since the practical applicability of these long stretching durations was questioned and studies exploring the transferability to the upper body are scarce, the aim of this study was to investigate the possibility of using a home-based stretching program to induce significant increases in maximum strength and flexibility. Therefore, 31 recreationally active participants (intervention group: 18, control group: 13) stretched the pectoralis major for 15min/day for eight weeks, incorporating three different stretching exercises. The maximum strength was tested isometrically and dynamically in the bench press (one-repetition maximum: 1RM) as well as shoulder range of motion (ROM) performing bilateral shoulder rotation with a scaled bar. Using a two-way analysis of variance (ANOVA) with repeated measures, the results showed high magnitude Time effects (ƞ² = 0.388-0.582, p < 0.001) and Group*Time interaction (ƞ² = 0.281-0.53, p < 0.001-0.002), with increases of 7.4 ± 5.6% in 1RM and of 9.8 ± 5.0% in ROM test in the intervention group. In the isometric testing, there was a high-magnitude Time effect (ƞ² = 0.271, p = 0.003), however, the Group*Time interaction failed to reach significance (p = 0.75). The results are in line with previous results that showed stretch-mediated maximum strength increases in the lower extremity. Future research should address the underlying physiological mechanisms such as muscle hypertrophy, contraction conditions as well as pointing out the relevance of intensity, training frequency and stretching duration.
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Affiliation(s)
- Konstantin Warneke
- Institute of Sport Science, Alpen-Adria-University Klagenfurt, Klagenfurt, Austria
- School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, Canada
| | - Martin Hillebrecht
- University Sports Center, Carl von Ossietzky University, Oldenburg, Germany
| | | | - Tim Wohlann
- University Sports Center, Carl von Ossietzky University, Oldenburg, Germany
| | - Michael Keiner
- Institute of Exercise and Training Science, German University of Health and Sport, Ismaning, Germany
| | - David G Behm
- School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, Canada
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Barrenetxea-Garcia J, Gil SM, Esain I, Torres-Unda J. Relationship between strength training and shoulder pain in male and female water polo players. J Exerc Rehabil 2023; 19:345-356. [PMID: 38188131 PMCID: PMC10766445 DOI: 10.12965/jer.2346472.236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 11/07/2023] [Indexed: 01/09/2024] Open
Abstract
The objective of this study was to assess the effect of two different strength-training methods on both male and female water polo players' performance and shoulder pain. The players were randomly allocated to a maximum strength (MS: 14 males, 8 females) or power strength (PS: 13 males, 8 females) training group. Before and after the intervention, we assessed player's anthropometric characteristics, shoulder internal and external rotation strength, hand grip strength, upper body strength, countermovement jump height, throwing velocity, swimming speed, shoulder pain on a visual analogue scale (VAS), wellness, and rate of perceived exertion per session. We observed no significant improvement (P<0.05) in specific skills but enhancement in hand grip strength in male players. In female players in the MS group, throwing speed and bench press weight decreased significantly (P<0.05). Shoulder external rotation strength at 240°/sec in male MS group players and shoulder external rotation strength at 60°/sec in female PS group players decreased significantly (P<0.05). In addition, from the first to the last week, shoulder pain increased significantly (P<0.05) in all players. Inverse correlations (P<0.05) were found between VAS and shoulder rotation strength in males in the PS group, and between wellness and shoulder internal rotation strength in men in the MS group and women in the PS group. We found that both MS and PS training did not enhance performance and increased shoulder pain in male and female water polo players.
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Affiliation(s)
- Josu Barrenetxea-Garcia
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa,
Spain
| | - Susana M. Gil
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa,
Spain
| | - Izaro Esain
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa,
Spain
| | - Jon Torres-Unda
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country (UPV/EHU), Leioa,
Spain
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Amado BL, De Lira CAB, Vancini RL, Forte P, Costa T, Weiss K, Knechtle B, Andrade MS. Comparison of Knee Muscular Strength Balance among Pre- and Post-Puberty Adolescent Swimmers: A Cross-Sectional Pilot Study. Healthcare (Basel) 2023; 11:healthcare11050744. [PMID: 36900749 PMCID: PMC10001498 DOI: 10.3390/healthcare11050744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 02/28/2023] [Accepted: 03/01/2023] [Indexed: 03/06/2023] Open
Abstract
Muscular weakness and strength imbalance between the thigh muscles are considered risk factors for knee injuries. Hormonal changes, characteristic of puberty, strongly affect muscle strength; however, it is unknown whether they affect muscular strength balance. The present study aimed to compare knee flexor strength, knee extensor strength, and strength balance ratio, called the conventional ratio (CR), between prepubertal and postpubertal swimmers of both sexes. A total of 56 boys and 22 girls aged between 10 and 20 years participated in the study. Peak torque, CR, and body composition were measured using an isokinetic dynamometer and dual-energy X-ray absorptiometry, respectively. The postpubertal boys group presented significantly higher fat-free mass (p < 0.001) and lower fat mass (p = 0.001) than the prepubertal group. There were no significant differences among the female swimmers. Peak torque for both flexor and extensor muscles was significantly greater in postpubertal male (p < 0.001, both) and female swimmers (p < 0.001 and p = 0.001, respectively) than in prepubertal swimmers. The CR did not differ between the pre- and postpubertal groups. However, the mean CR values were lower than the literature recommendations, which brings attention to a higher risk of knee injuries.
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Affiliation(s)
- Bruno Lombardi Amado
- Sports Medicine Residency Program, Department of Orthopedics and Traumatology, Federal University of São Paulo, São Paulo 04021-001, Brazil
| | - Claudio Andre Barbosa De Lira
- Human and Exercise Physiology Division, Faculty of Physical Education and Dance, Federal University of Goiás, Goiânia 74690-900, Brazil
| | - Rodrigo Luiz Vancini
- Center for Physical Education and Sports, Federal University of Espírito Santo, Vitória 29075-910, Brazil
| | - Pedro Forte
- Department of Sport, Higher Institute of Educational Sciences of the Douro, 4560-547 Porto, Portugal
- Department of Sports, Instituto Politécnico de Bragança, 5300-253 Bragança, Portugal
- Research Center in Sports, Health and Human Development, 7000-671 Covilhã, Portugal
| | - Taline Costa
- Department of Physiology, Federal University of São Paulo, São Paulo 04021-001, Brazil
| | - Katja Weiss
- Institute of Primary Care, University of Zurich, 8091 Zürich, Switzerland
| | - Beat Knechtle
- Institute of Primary Care, University of Zurich, 8091 Zürich, Switzerland
- Correspondence:
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Warneke K, Wagner CM, Keiner M, Hillebrecht M, Schiemann S, Behm DG, Wallot S, Wirth K. Maximal strength measurement: A critical evaluation of common methods-a narrative review. Front Sports Act Living 2023; 5:1105201. [PMID: 36873661 PMCID: PMC9981657 DOI: 10.3389/fspor.2023.1105201] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Accepted: 01/30/2023] [Indexed: 02/19/2023] Open
Abstract
Measuring maximal strength (MSt) is a very common performance diagnoses, especially in elite and competitive sports. The most popular procedure in test batteries is to test the one repetition maximum (1RM). Since testing maximum dynamic strength is very time consuming, it often suggested to use isometric testing conditions instead. This suggestion is based on the assumption that the high Pearson correlation coefficients of r ≥ 0.7 between isometric and dynamic conditions indicate that both tests would provide similar measures of MSt. However, calculating r provides information about the relationship between two parameters, but does not provide any statement about the agreement or concordance of two testing procedures. Hence, to assess replaceability, the concordance correlation coefficient (ρ c) and the Bland-Altman analysis including the mean absolute error (MAE) and the mean absolute percentage error (MAPE) seem to be more appropriate. Therefore, an exemplary model based on r = 0.55 showed ρ c = 0.53, A MAE of 413.58 N and a MAPE = 23.6% with a range of -1,000-800 N within 95% Confidence interval (95%CI), while r = 0.7 and 0.92 showed ρ c = 0.68 with a MAE = 304.51N/MAPE = 17.4% with a range of -750 N-600 N within a 95% CI and ρ c = 0.9 with a MAE = 139.99/MAPE = 7.1% with a range of -200-450 N within a 95% CI, respectively. This model illustrates the limited validity of correlation coefficients to evaluate the replaceability of two testing procedures. Interpretation and classification of ρ c, MAE and MAPE seem to depend on expected changes of the measured parameter. A MAPE of about 17% between two testing procedures can be assumed to be intolerably high.
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Affiliation(s)
- Konstantin Warneke
- Department for Exercise, Sport and Health, Leuphana University Lüneburg, Lüneburg, Germany
- School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. Johns, NL, Canada
| | - Carl-Maximilian Wagner
- Department of Training Science, German University of Health and Sport, Berlin, Baden-Württemberg, Germany
| | - Michael Keiner
- Department of Training Science, German University of Health and Sport, Berlin, Baden-Württemberg, Germany
| | - Martin Hillebrecht
- University Sports Center, Carl von Ossietzky University of Oldenburg, Oldenburg, Germany
| | - Stephan Schiemann
- Department for Exercise, Sport and Health, Leuphana University Lüneburg, Lüneburg, Germany
| | - David George Behm
- School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. Johns, NL, Canada
| | | | - Klaus Wirth
- Faculty of Training and Sports Science, University of Applied Science Wiener Neustadt, Vienna, Austria
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Wagner CM, Warneke K, Bächer C, Liefke C, Paintner P, Kuhn L, Brauner T, Wirth K, Keiner M. Despite Good Correlations, There Is No Exact Coincidence between Isometric and Dynamic Strength Measurements in Elite Youth Soccer Players. Sports (Basel) 2022; 10:175. [PMID: 36355825 PMCID: PMC9692642 DOI: 10.3390/sports10110175] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/03/2022] [Accepted: 11/07/2022] [Indexed: 02/23/2024] Open
Abstract
Speed strength performances are substantially dependent on maximum strength. Due to their importance, various methods have been utilized to measure maximum strength (e.g., isometric or dynamic) with discussed differences regarding transferability to sport-specific movements dependent upon the testing procedure. The aim of this study was to analyze whether maximum isometric force (MIF) during isometric back squats correlates with maximum strength measurements of the one repetition maximum (1RM) in the squat, with countermovement jump (CMJ) performance, and with drop jump (DJ) performances in elite youth soccer players (n = 16, 18.4 ± 1.5 [range: 17-23] years old). Additionally, concordance correlation coefficients (CCC, [ρc]) between isometric and dynamic measurements were calculated to verify whether one measurement can actually reproduce the results of the other. To improve comprehension, differences between isometric and dynamic testing values were illustrated by providing differences between both testing conditions. For this, the mean absolute error (MAE) and the mean absolute percentage error (MAPE) were calculated. To reach equality in scale, the 1RM measures were multiplicated by 9.81 to obtain a value of N. The 1RM demonstrated correlations of τ = |0.38| to |0.52| with SJ and CMJ performances, while MIF demonstrated correlations of τ = |0.21| to |0.32|. However, the correlations of both 1RM and MIF with the DJ reactive strength index (RSI = jump height /contact time) from different falling heights were of no statistical significance. The data showed significant correlations between both the absolute (τ = |0.54|) and the relative (τ = |0.40|) performances of 1RM and MIF, which were confirmed by CCC of ρc= |0.56| to |0.66|, respectively. Furthermore, the MAE and MAPE showed values of 2080.87 N and 67.4%, respectively. The data in this study show that, despite good correlations, there is no exact coincidence between isometric and dynamic strength measurements. Accordingly, both measurements may only represent an estimation of maximal strength capacity and cannot be substituted for each other. Therefore, maximal strength should be tested by using high similarity in the contraction condition, as it is used in the training process to counteract underestimation in strength because of unfamiliarity with the testing condition.
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Affiliation(s)
- Carl-M. Wagner
- Department of Training Science, German University of Health & Sport, 85737 Ismaning, Germany
| | - Konstantin Warneke
- Department for Exercise, Sport and Health, Leuphana University, 21335 Lüneburg, Germany
| | - Christoph Bächer
- Department of Training Science, German University of Health & Sport, 85737 Ismaning, Germany
- SSV Jahn Regensburg, 93059 Regensburg, Germany
| | | | | | - Larissa Kuhn
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Torsten Brauner
- Department of Training Science, German University of Health & Sport, 85737 Ismaning, Germany
| | - Klaus Wirth
- Faculty of Training and Sports Science, University of Applied Science Wiener Neustadt, 2700 Vienna, Austria
| | - Michael Keiner
- Department of Training Science, German University of Health & Sport, 85737 Ismaning, Germany
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