The Relationship Between Unilateral and Bilateral Lowerbody Strength and Field-based Performance Tests in Division III College Team-sport Athletes PDF Download
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Author: Bashir A. Ismail
Publisher:
ISBN:
Category :
Languages : en
Pages : 99
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ABSTRACT: The purpose of the study was to investigate the relationship between unilateral (UNI) and bilateral (BIL) squat strength and field-based performance tests of sprint speed and change of direction speed (CODS) in Division III team sport athletes. Data was collected from 28 healthy male athletes (19.61 ± 1.07 year, 179.42 ± 4.85 cm, 79.91 ± 10.35 kg). Athletes represented team sports such as football, lacrosse, soccer and baseball. Subjects completed the Pro-agility, 30 m sprint test and 3 RM strength tests unilaterally with the rear foot elevated split squat (RFESS)and bilaterally with front squat, whereby load lifted was used to calculate relative strength ratio. No significant correlation was found between RFESS strength, and CODS or 30m sprint (r = -.255, p > .05, r = -.276, respectively). No significant correlation was found between BIL strength, and CODS or 30 m sprint (r = -.296, p >.05, r = -.349, respectively), although BIL strength produced a moderate to large effective size with the 30 m sprint (r2 = .121). Despite no significant relationships between lower-body strength and field-based performance measures exists, strength and conditioning practitioners should not be discouraged from implementing UNI training with their athletes. The lack of strong relationship between neither BIL or UNI strength and field-based performance measures indicates that neither method is more effective to develop foundations for speed and CODS.
Author: Bashir A. Ismail
Publisher:
ISBN:
Category :
Languages : en
Pages : 99
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ABSTRACT: The purpose of the study was to investigate the relationship between unilateral (UNI) and bilateral (BIL) squat strength and field-based performance tests of sprint speed and change of direction speed (CODS) in Division III team sport athletes. Data was collected from 28 healthy male athletes (19.61 ± 1.07 year, 179.42 ± 4.85 cm, 79.91 ± 10.35 kg). Athletes represented team sports such as football, lacrosse, soccer and baseball. Subjects completed the Pro-agility, 30 m sprint test and 3 RM strength tests unilaterally with the rear foot elevated split squat (RFESS)and bilaterally with front squat, whereby load lifted was used to calculate relative strength ratio. No significant correlation was found between RFESS strength, and CODS or 30m sprint (r = -.255, p > .05, r = -.276, respectively). No significant correlation was found between BIL strength, and CODS or 30 m sprint (r = -.296, p >.05, r = -.349, respectively), although BIL strength produced a moderate to large effective size with the 30 m sprint (r2 = .121). Despite no significant relationships between lower-body strength and field-based performance measures exists, strength and conditioning practitioners should not be discouraged from implementing UNI training with their athletes. The lack of strong relationship between neither BIL or UNI strength and field-based performance measures indicates that neither method is more effective to develop foundations for speed and CODS.
Author: Olivia H. Indorf
Publisher:
ISBN:
Category :
Languages : en
Pages : 79
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ABSTRACT: The bilateral squat is traditionally chosen as a main lower body exercise in strength and conditioning programs, with unilateral lower body exercises being used as assistance exercises that generally receive less emphasis (McCurdy et al., 2005). Most sport skills, however, such as running, jumping, bounding, and changing direction, are performed unilaterally (Speirs et al., 2016). The purpose of the current study was to determine the relationship between unilateral and bilateral lower body strength and power. Twenty-two NCAA division III football players between the ages of 18-23 participated in the current study. Pearson product moment correlations were conducted to assess the relationship between front squat 1RM and peak power, split squat 1RM and peak power, and front squat 1RM and split squat 1RM. Significant positive linear relationships were found between peak power and front squat 1RM (r = .516, p = .014), peak power and split squat 1RM (r = .451, p = .035) and front squat 1RM and split squat 1RM (r = .778, p
Author: Andrew K. Papirio
Publisher:
ISBN:
Category :
Languages : en
Pages : 82
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ABSTRACT: The bilateral deficit (BD) is a well-established phenomenon describing the difference in force capabilities between bilateral and unilateral movements. The majority of research has used seated machine-based protocols to measure the BD and deduce training implications. However, these are uncommon in modern strength training practices and do not reflect the movement patterns found in sport. The purpose of this study was to use a ground-based multi-joint exercise to determine if a BD was present in trained athletes. Forty trained NCAA Division III football players (20.9 + 0.8 years, 209.7 + 30.1 lb., 71.2 + 2.2 in) completed a bilateral and unilateral 1RM deadlift. Participants were divided into two groups to ensure that fatigue and the order of the 1RM tests did not have any effect. Group A (n = 17) completed the bilateral 1RM deadlift first, Group B (n = 23) completed the unilateral 1RM deadlift first. The remaining test was performed 48-72 hours later to provide adequate rest. Unilateral 1RM values were multiplied by two and compared to the participants’ bilateral 1RM. A significant bilateral deficit was present in both groups (M = 102.5). Participants were significantly stronger on one leg, relatively. Despite perceptions about bilateral facilitation, experienced athletes with a balanced training history appear to experience a BD and possess the capacity to be stronger on one leg. These findings suggest that trained athletes may benefit from unilateral training for the development of strength.
Author: Dominique Ouellette
Publisher:
ISBN:
Category :
Languages : en
Pages : 76
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ABSTRACT: The present study was conducted to investigate the relationship between both unilateral and bilateral lower body power and rotational power. Subjects (N = 51) were Division III athletes who were likely to exhibit high levels of rotational power due to involvement in rotational sports (i.e. baseball, softball, track and field throwers, and lacrosse athletes). Lower body power (watts/kilogram) was measured by having subjects complete unilateral and bilateral countermovement jumps on an AMTI portable force plate. Rotational power was assessed during a maximal effort lateral medicine ball throw using a 6.6lb A2P ballistic medicine ball that measures velocity via internal accelerometry. Results were a strong positive correlation between both unilateral and bilateral lower body power and rotational power. The resulting correlations were significant (p
Author: Frances Stephenson
Publisher:
ISBN:
Category :
Languages : en
Pages : 58
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The purpose of this investigation was to analyze the correlation between bilateral versus unilateral strength on jump and sprint performance in college athletes. Thirteen male, college soccer athletes were asked to perform a bilateral and unilateral 5RM squat test, a bilateral and unilateral vertical and long jump test, and a 40 yard sprint test. The data was then analyzed to determine the correlations between strength and jump and sprint performance. No significant correlations were found between bilateral strength and bilateral jump and sprint performance. Nor were any significant correlations found between unilateral strength and unilateral jump or sprint performance. When the ratio of bilateral to unilateral strength was tested against the ratio of bilateral to unilateral jump performance, no significant correlations were found. Contrary to our hypothesis, a greater level of unilateral strength did not correlate with greater unilateral performance. Future research should investigate the correlation between bilateral and unilateral strength to sprint and jump performance in athletes of various levels of play as well as a variety of sports to determine if these results are universal or specific to athletes tested in this study.
Author: Michelle J. Boland
Publisher:
ISBN:
Category : Plyometrics
Languages : en
Pages : 250
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ABSTRACT: The current study was designed to determine the effect of unilateral and bilateral training on soccer performance variables. Subjects included 18 male soccer studentathletes. Five 2 x 2 mixed factorial analyses of variance (ANOVA) were conducted to analyze the data. The dependent variables were 10 m sprint, 40 m sprint, strength, power, and kicking speed. The independent group variable was type of training (unilateral, bilateral) and the repeated measures factor was test occasion (pre, post). Significant main effects for strength and power were observed for the variables of type of training (p = .00; p = .03) and test occasion (p = .00; p = .01). No significant interaction effects were observed for strength or power. The unilateral group had a greater non-significant percent increase in both strength and power. No significant main or interaction effects were found for the dependent variables of 10 m sprint, 40 m sprint, or kicking speed. The 5 weeks of training elicited improvements in strength and power with greater improvements found in unilateral based training.
Author: Paul W. Park
Publisher:
ISBN:
Category : Soccer
Languages : en
Pages : 112
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ABSTRACT: The study was designed to compare the effects of a unilateral (UNI) and bilateral (BI) focused offseason training program on speed and agility performance. Seventeen Division III collegiate soccer athletes were randomly assigned into either a UNI (N = 9) or BI (N = 8) focused training program. The subjects were familiarized and tested in the 40-yard dash, proagility drill, and the 3-cone drill before and after the 6-week training program. The training programs consisted of heavy resistance training sessions twice a week and a plyometric and running training day once a week. The BI training program consisted of resistance and plyometric exercises with both legs contacting the ground simultaneously while the UNI training program consisted of exercises with only one leg contacting the ground. Five 2x2 ANOVAs and Cohen's effect sizes were used to examine the effects of a UNI or BI focused program pre and post a 6-week training period. No significant differences were found between the UNI and BI training groups or pre and post the 6-week training period for the five dependent variables: 40-yard dash, left proagility, right proagility, left 3-cone drill, and right 3-cone drill. Cohen's effect sizes (d) were computed for both groups and showed all positive effect sizes for the UNI training group with the largest being 0.74 for the left 3-cone drill and 0.60 for the right 3-cone drill. The BI training group showed all negative effect sizes except for the left 3-cone drill (0.19) with the largest being -0.73 for the 20-yard dash. The recommendation to coaches is to emphasize unilateral exercises into their speed and agility programs, and consider removing bilateral back loaded exercise due to the possible risk associated with low back injury.
Author: Xiang Zhao
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ISBN:
Category :
Languages : en
Pages :
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Author: Graeme Lehman
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Category :
Languages : en
Pages :
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Baseball specific athleticism, potential and performance have been difficult to predict. Muscle strength and power has shown to help increase throwing velocity through resistance training research however themajority of research has focused on the upper body. The present study sought to determine if bilateral or unilateral lower body field testing correlates with throwing velocity and if so to what extent. Throwing velocity scores were correlated to the following tests; medicine ball scoop toss and squat throw, bilateral and unilateral vertical jumps, single and triple broad jumps, hop and stop in both directions, lateral to medial jumps, 10 and 60 yard dash, and both left and right single leg 10 yard hop for speed in 42 college baseball players. It was hypothesized that the concentric strength of the trail leg and the eccentric strength of thelead leg will correlate positively with throwing velocity. A stepwise multiple regression analysis, assessing therelationship between shuffle and stretch throwing velocities and lower body field test results determined that right handed throwing velocity from the stretch position was significantly predicted by lateral to medial jump right (LMJR) and body weight (BW) R2 =0.322, whereas lateral to medial jump left (LMJL) R2 = 0.688 significantly predicted left stretch throw. Right handed shuffle throw was significantly related to LMLR and Medicine Ball scoop R2 =0.338; whereas, LMJL, BW and LMJR significantly contributed to left handed shuffle throw R2=0.950. Overall, this study found that lateral to medial jumps were consistently correlated with highthrowing velocity in each of the throwing techniques, in both left and right handed throwers. This is relevant because it is the first study to our knowledge to correlate throwing velocity with a unilateral jump in thefrontal plane, mimicking the action of the throwing stride.
Author: Mathew Herold
Publisher:
ISBN:
Category : Back exercises
Languages : en
Pages : 142
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