The importance of isometric maximum strength in college wrestlers

Journal of sports science & medicine (Impact Factor: 1.03). 01/2006; 5(CSSI):108-13.
Source: PubMed


Previous research has demonstrated the importance of isometric maximal strength (PF) and rate of force development (RFD) in a variety of athletic populations including track cyclists and track and field athletes. Among coaches and sports scientists there is a lack of agreement regarding how much strength is required for optimal performance in most sports. The purpose of this study was to examine relationships between measures of PF, RFD and one repetition maximum (1RM) strength with other variables that might contribute to successful performance in collegiate wrestlers. Eight men (M = 20.0, SD = 0.4 years; Height M = 1.68, SD = 0. 13 m; Mass M = 78.0, SD = 4.2 kg) who were Division III college wrestlers participated in this study. They were tested for PF using the isometric mid thigh pull exercise. Explosive strength was measured as RFD from the isometric force-time curve. The 1RM for the squat, bench press and power clean exercises were determined as a measure of dynamic strength. Vertical jump height was measured to determine explosive muscular power. The wrestlers also ranked themselves and the coaches of the team also provided a ranking of the athletes. Correlations between the variables were calculated using the Pearson product moment method. Results indicated strong correlations between measures of PF and 1RM (r = 0.73 - 0.97). The correlations were very strong between the power clean 1RM and PF (r = 0.97) and squat 1RM and PF (r = 0.96). There were no other significant correlations with other variables apart from a strong correlation between RFD and coaches ranking (r = 0.62). Findings suggest that isometric mid thigh pull test does correlate well with 1RM testing in college wrestlers. RFD does not appear to be as important in college wrestlers. The isometric mid thigh pull provides a quick and efficient method for assessing isometric strength in athletes. This measure also provides a strong indication of dynamic performance in this population. The lack of strong correlations with other performance variables may be a result of the unique metabolic demands of wrestling. Key PointsIn Division III collegiate wrestlers the isometric mid thigh pull test correlates well with 1RM testing.Rate of Force Development does not appear to be as important in college wrestlers.The lack of strong correlations with other performance variables may be a result of the unique metabolic demands of wrestling.

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Available from: Michael McGuigan, Oct 07, 2015
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    • "The UBIST was also strongly associated with the absolute strength measure performed. Though there is little available data in the literature in regard to upper body isometric testing, previous work by McGuigan et al. (2006) demonstrated similar correlations between an isometric mid-thigh pull (lower body) and 1RM measures (r values range: 0.73-0.97). This finding was similar to the reports of Beckham et al. (2013) who reported strong correlations between absolute peak force on an isometric mid-thigh pull and lifting performance for the Olympic lifts. "
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    ABSTRACT: The purpose of the present investigation was to examine the association of a novel test of upper body isometric strength against a 1RM bench press measurement. Forty college age adults (n = 20 female, n = 20 male; age 22.8 ± 2.8 years; body height 171.6 ± 10.8 cm; body mass 73.5 ± 16.3 kg; body fat 23.1 ± 5.4%) volunteered for the present investigation. The participants reported to the lab on three occasions. The first visit included anthropometric measurements and familiarization with both the upper body isometric test and bench press exercise. The final visits were conducted in a randomized order, with one being a 1RM assessment on the bench press and the other consisting of three trials of the upper body isometric assessment. For the isometric test, participants were positioned in a "push-up" style position while tethered (stainless steel chain) to a load cell (high frequency) anchored to the ground. The peak isometric force was consistent across all three trials (ICC = 0.98) suggesting good reliability. Multiple regression analysis was completed with the predictors: peak isometric force, gender, against the outcome variable 1RM bench press. The analysis resulted in a significant model (r2 = 0.861, p≤0.001) with all predictor variables attaining significance in the model (p<0.05). Isometric peak strength had the greatest effect on the model (Beta = 5.19, p≤0.001). Results from this study suggest that the described isometric upper body strength assessment is likely a valid and reliable tool to determine strength. Further research is warranted to gather a larger pool of data in regard to this assessment.
    Journal of Human Kinetics 01/2015; 47:189-195. DOI:10.1515/hukin-2015-0074 · 1.03 Impact Factor
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    • "The horizontal error bar represents the 95% confidence interval for the time at which the onset of the M-wave occurred. external validity compared to other isometric [5] [7] [28] or dynamic rate of force development studies [30,37,?] with greater experimental control over the load, velocity , and moment/force. "
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    ABSTRACT: Background: The rate of torque development (RTD) and the rate of velocity development (RVD) have previously been described as related; however, a direct comparison has not been performed. Objective: The purposes of this study were to compare voluntary and evoked RVD and RTD during the same maximal isokinetic leg extensions muscle actions and to indirectly explore the influence of motor unit discharge frequency on these variables. Methods: Sixteen men completed three maximal voluntary and three maximal evoked isokinetic leg extension muscle actions at 60°·s-1. Peak RVD, general RVD, peak RTD, and electromechanical delay (EMD) were calculated from the voluntary and evoked muscle actions. Voluntary and evoked RTD and RVD were also calculated for each 10 ms epoch up to 200 ms of the muscle actions. Results: There was no interaction between voluntary and evoked RVD across time (p=0.12), but there was an interaction for RTD (p<0.01). However, peak RTD occurred prior to the isokinetic load range. Peak RTD (p<0.001), peak RVD (p< 0.01), general RVD (p< 0.01), isokinetic load range (p<0.001), EMD (p<0.001), and PT (p<0.001) were greater for voluntary than evoked muscle actions, which was expected due to the influence of voluntary motor unit firing rates. Conclusions: Overall, these results suggested that the calculation of RTD during the acceleration phase of an isokinetic muscle action may not be valid due to the unknown load and increasing velocity. Furthermore, the RVD may be influenced by motor unit firing rate, but to a lesser extent than RTD.
    Isokinetics and exercise science 01/2013; 21(3):253-261. DOI:10.3233/IES-130504 · 0.49 Impact Factor
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    • "The first measure was a key performance indicator (KPI) based upon two coach-identified skills according to player positional requirements (e.g., for a forward lineout wins and ruck clears, for a back the number of ball carries over the advantage line) [21]. The second measure was an overall performance indicator (OPI) during each game with two coaches (lead playing coach and assistant) assisted by the game statistician contributing and averaging their scores, which is similar to that used previously to rate athletes during competitive sport [22] [23]. This rating was based on several factors including: the opposition and venue, the abilities of the team and their work rate within each game, adherence to game plan, errors and penalties conceded . "
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