Effect of Functional Isometric Squats on Vertical Jump in Trained and Untrained Men

Berning, Joseph M.; Adams, Kent J.; DeBeliso, Mark; Sevene-Adams, Patricia G.; Harris, Chad; Stamford, Bryant

doi:10.1519/jsc.0b013e3181e7ff9a

Cited by 38 publications

(32 citation statements)

References 18 publications

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“…PAP is known to significantly enhance muscular power assessed through isokinetic contractions [2], jumps [2, 3, 5], and other athletic activities [11]. However, in the present study, a previous MVC led to 3.5% increases in IPT of a second MVC performed 180 seconds later.…”

Section: Discussioncontrasting

confidence: 66%

Postactivation Potentiation Biases Maximal Isometric Strength Assessment

Lima

Oliveira

et al. 2014

BioMed Research International

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Postactivation potentiation (PAP) is known to enhance force production. Maximal isometric strength assessment protocols usually consist of two or more maximal voluntary isometric contractions (MVCs). The objective of this study was to determine if PAP would influence isometric strength assessment. Healthy male volunteers (n = 23) performed two five-second MVCs separated by a 180-seconds interval. Changes in isometric peak torque (IPT), time to achieve it (tPTI), contractile impulse (CI), root mean square of the electromyographic signal during PTI (RMS), and rate of torque development (RTD), in different intervals, were measured. Significant increases in IPT (240.6 ± 55.7 N·m versus 248.9 ± 55.1 N·m), RTD (746 ± 152 N·m·s−1 versus 727 ± 158 N·m·s−1), and RMS (59.1 ± 12.2% RMSMAX versus 54.8 ± 9.4% RMSMAX) were found on the second MVC. tPTI decreased significantly on the second MVC (2373 ± 1200 ms versus 2784 ± 1226 ms). We conclude that a first MVC leads to PAP that elicits significant enhancements in strength-related variables of a second MVC performed 180 seconds later. If disconsidered, this phenomenon might bias maximal isometric strength assessment, overestimating some of these variables.

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Section: Discussioncontrasting

confidence: 66%

Postactivation Potentiation Biases Maximal Isometric Strength Assessment

Lima

Oliveira

et al. 2014

BioMed Research International

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“…The improvement in the Prowler and 18.2 meter sprint times as a result of the BSQ PAP warmup found in this study is consistent with prior studies which have demonstrated that a PAP warmup can significantly increase both upper and lower body power output [10][11][12][13][14][15]. Fourteen of the participants experienced an improvement in sled push times while the others experienced no change or a slower time as the result of the PAP warmup.…”

Section: Discussionsupporting

confidence: 90%

Post Activation Potentiation in North American High School Football Players

Tano¹,

Bishop²,

Berning³

et al. 2016

JSS

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Post activation potentiation (PAP) is an acute enhancement of muscular power production resulting from a high intensity potentiating exercise. Practical applications of the PAP phenomena as a warmup strategy are the focus of ongoing research. This study compared the effects of a dynamic and a PAP warm up strategy on speed and horizontal plane muscular power output. High School male football players (n = 16) participated in a repeated measures cross over design study consisting of 3 testing days. Day 1: one repetition maximum (1-RM) back squats were established. Day 2: half of the participants completed a dynamic warmup consisting of dynamic movements (ex. high knees, butt kickers, frog jumps, cherry pickers, lateral slide, karaokes, back pedal) while the other half of the participants performed a PAP warmup consisting of back squats culminating in a set of 4 repetitions at 85% of 1-RM. Following the warmups (4-minutes), the participants performed 3 trials of a weighted sled push 91 kilograms (200 pounds) over a 9.1 meter (10 yards) linear path. Following the sled pushes, the participants then performed three trials of 18.2 meter (20 yards) sprints. Day 3: participants crossed over with respect to the warmup procedures and again performed the three sled push and sprint trials. Dependent t-tests were used to compare the sled push and sprint times between warm up conditions. Both the 18.2 meter sprint (P < 0.01) and the 91 kilogram sled push (P < 0.01) showed a significant improvement when PAP was utilized as a warmup, rather than the dynamic warmup. Within the parameters of the study, it is concluded that PAP as a warm up strategy enhances sprint ability and horizontal plane muscular power output.

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“…The present study used recreationally trained individuals to investigate lower body isometric strength after various warm-up protocols. Berning et al (2010), reported that a general warm-up (5-minutes of cycling) in conjunction with one, 3-second heavy isometric squat (150% of the participants 1RM) elicited greater vertical jump height in recreationally trained individuals indicating that a supramaximal isometric muscle action enhances performance. This suggests the isometric intensity utilized in the present study may not have been great enough to elicit increased strength.…”

Section: Discussionmentioning

confidence: 99%

Influence of Whole Body Vibration and Specific Warm-ups on Force during an Isometric Mid-Thigh Pull

Cazas-Moreno

Gdovin²,

Williams³

et al. 2015

IJKSS

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Purpose: The purpose of this study was to investigate the effects of general and specific warm-up protocols on rate of force development (RFD), relative RFD (rRFD), ground reaction force (GRF) and relative ground reaction force (rGRF) during an isometric mid-thigh pull (IMTP), after WBV exposure. Methods: Fifteen healthy recreationally trained males (age: 24.1 ± 2.3 yrs, height: 72.9 ± 7.8 cm; mass: 86.9 ± 8.3) completed five protocols: baseline, isometric vibration (iVib), isometric no vibration (iNV), dynamic vibration (dVib) and dynamic no vibration (dNV). The baseline was completed without any warm-up prior to the IMTP. The intervention protocols had the same prescription of 4 sets of 30-second bouts of quarter squats (dynamic [DQS] and isometric [IQS]) on the WBV platform with or without vibration. Following a one-minute rest period after each protocol, participants completed three maximal IMTPs. Results: Repeated measures ANOVA with a Bonferroni post hoc demonstrated that RFD in dNV (7657.8 ± 2292.5 N/s) was significantly greater than iVib (7156.4 ± 2170.0 N/s). However, the other experimental trials for RFD demonstrated no significant differences (p>0.05). There were also no significant differences for rRFD, GRF or rGRF between protocols. Conclusion: These results demonstrate that a dynamic warm-up without WBV elicits greater RFD than an isometric warm-up with WBV prior to a maximal isometric exercise. Further research needs to be investigated utilizing dynamic and isometric warm-ups in conjunction with WBV and power output.

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Effect of Functional Isometric Squats on Vertical Jump in Trained and Untrained Men

Cited by 38 publications

References 18 publications

Postactivation Potentiation Biases Maximal Isometric Strength Assessment

Postactivation Potentiation Biases Maximal Isometric Strength Assessment

Post Activation Potentiation in North American High School Football Players

Influence of Whole Body Vibration and Specific Warm-ups on Force during an Isometric Mid-Thigh Pull

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