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[journalofsportsmedicine]

A Comparison of Muscle Activation during the Pull-up and Three Alternative Pulling Exercises-Juniper Publishers Introduction The pull-up is primarily an upper body exercise used to train the muscular endurance or muscular strength components of fitness. This challenging exercise requires the participant pull their entire body weight from a dead hang using only their upper body musculature. Many individuals struggle with being able to complete one repetition (rep) as well as increasing the maximum number of reps they are able to complete. As a result, training for improved pull-up performance can be quite frustrating as an individual is often not able to assess how close they are to being able to complete a pull-up until they successfully do so. Being able to train for the pull-up through similar modified or alternative exercises would assist with both progress tracking and assessment, as well as developing appropriate exercise-specific periodized programs Astrand, Rodahl, Dahl and Stromme [1], Bompa [2], MacIntosh, Gardiner and McComas [3]. Exercises that are often used in training programs to improve upper body pulling strength and muscular endurance include the seated lat-pulldown, assisted pull-up/chin-up machine, Baumgartner Modified Pull-up, Band/partner-assisted pull-ups, kipping pull-ups, suspended pull-ups, etc. Baumgartner and Gaunt [4] Halet, Mayhew, Murphy and Fanthorpe [5], Johnson, Lynch, Nash, Cygan and Mayhew [6]; Ronai & Scibek [7], Snarr, Casey, Hallmark and Esco [8], Snarr, Hallmark, Casey and Esco [9]. While all of these exercises utilize the pulling motion, some are likely more similar to the traditional pull-up exercise than others. There appears to be three key features of interest when attempting to determine which of these alternative exercises might have the greatest transference to the traditional pull-up. The first is the magnitude of muscle activation in the prime movers (i.e. latissimus dorsi, biceps brachii, trapezius, deltoid, erector spinae, rectus abdominis, etc. Dickie, Faulkner, Barnes and Lark [10], Snarr [9]. Activating the main muscles used in the alternative pulling exercises to a similar extent as that of the pull-up will result in maximal transference from the training program and exercises to the exercise of interest; the body weight pull-up. The second key feature of interest in the alternative exercise is pulling the body in the vertical direction, against the force of gravity Ronai and Scibek [4]. As the body and pulling motion becomes more horizontal, it is reasonable to assume that the muscle recruitment patterns will also be adjusted (e.g. increased rhomboid and middle trapezius activity). By keeping the motion in the vertical direction, the same muscle groups will likely be used. Therefore, exercises that do not maintain a vertically aligned body position throughout a vertical pulling motion will not be used as an alternative pulling exercise for this study (e.g. Baumgartner Modified Pull-up, suspended pull-ups, inverted rows, etc.). Finally, when designing a periodized training program, it is important to be able to track and adjust the load of the exercises to ensure that progress is being made and that plateaus can be minimized or avoided all together Astrand [1] Bompa [2], MacIntosh [3]. In order to do this, the amount of weight being moved during the alternative exercise must be known and easily increased (or decreased) as the training program progresses through macrocycles. While suspension exercises are able to increase and decrease the load of the exercise, it is more difficult to determine the exact load being lifted when using elastic resistance bands, partner assistance, or other suspension devices. Additionally, pull-ups performed utilizing excessive lower body motion (i.e. kipping) integrate a greater amount of momentum when performing the pulling action than that of the traditional pull-up from a dead hang. As previous research has reported, the muscular demand of the upper body is significantly lower when performing kipping pull-ups when compared to that of traditional pull-ups Snarr [8]. Therefore, exercises of this nature will also not be used as alternative pulling exercises for this study (e.g. band/partner-assisted pull-ups, feet suspended pull-ups, kipping pull-ups, etc.). Considering these three key factors for comparison of the alternative exercises with the pull-up, the exercises with the greatest transference potential appears to be the seated lat pull-down and assisted pull-up machine. While the assisted pull-up requires the same body position of the traditional pull-up from the hips up, the seated position of the lat-pulldown may recruit the core stabilizing muscles (e.g. rectus abdominis, transverse abdominis, erector spinae, etc.) and hip flexors (e.g. iliopsoas and rectus femoris) to a lesser extent as a result of being supported in the seated position throughout the exercise. Performing the lat-pulldown from a kneeling position would create the neutral hip position that is more consistent with the traditional pull-up (and assisted pull-up) exercise. Research has recently begun to investigate the muscle activity of the latpulldown when varying the hand grip width and technique Dickie [10]; Lusk, Hale and Russell [11], Signorile, Zink and Szwed [12], Sperandei, Barros, Silveira-Junior and Oliveira [13]. However, to the knowledge of the authors of this study, the activation magnitudes of the prime movers during alternative pulling exercises compared to that of the BW pull-up has yet to be explored. Therefore, the purpose of this study is to determine if the magnitudes of muscle activation in the prime movers of one of the alternative pulling exercises (i.e. seated lat-pulldown, kneeling lat-pulldown and assisted pull-up machine) is more similar than the other two to the magnitudes of muscle activation in the traditional body weight pull-up. It was hypothesized that the seated lat-pulldown would have the weakest correlation and smallest shared variance with the pull-up due primarily to a decrease in activation of the rectus abdominis because of the seated position during the exercise. Methods Forty-one uninjured college-aged males (n = 28) and females (n = 13) participated in this study (see Table 1 for subject characteristics). All procedures were approved by the United States Military Academy Human Research Protection Program before commencing the study. Prior to participation, an informed written consent was obtained from each subject. All testing took place in the USMA Human Performance Laboratory.  Procedures Upon arrival to the single testing session, the age, height, weight and max number of pull-ups performed in a single bout (self-reported) were recorded for each participant. Investigators then led the participants through a 5-minute standardized warmup which focused on shoulder and thoracic mobility. Wireless surface electromyography (EMG) electrodes (Delsys, Inc., Natick, MA, USA) were then placed on the right side of the body, centered over the muscle belly of the latissimus dorsi (LAT), trapezius (middle fibers) (TRAP), biceps brachii (BI), and rectus abdominis (RA) see in Figure 1. A 5-second maximum voluntary isometric contraction (MVIC) was recorded for each of the four muscles; a modified lat pulldown (i.e. supinated grip, shoulder width hand placement on bar, pulling down until the elbows are parallel to the shoulders) was used for the LAT and BI, a seated row (pulling back until the upper arms were in line with the torso) for the TRAP, and a resisted curl-up (arms placed across the chest, knees bent to 90⁰; the participant curls up approximately 30⁰ off the ground and is manually resisted at the shoulders) for the RA Konrad [14]. Following MVIC data collection, participants were allowed to familiarize themselves with the 4 exercises. No more than 3 repetitions of each exercises were taken by any of the participants. Participants performed 5 repetitions of each of the 4 exercises; body weight (BW) pull-up (PU), seated lat-pulldown (sLP) at 80% BW, kneeling lat-pulldown (kLP) at 80% BW, and assisted pullup (aPU) at 20% BW deficit see in Figures 2-5 Johnson [6]. Hand placement was standardized across subjects as 1.5x bi-acromial width Andersen, Fimland, Wiik, Skoglund and Saeterbakken [15]. The order of exercises was randomly assigned using a block randomization design. For example, Participant 1 would perform sLP, kLP, aPU and finally PU. Participant 2 would perform kLP, aPU, PU, and finally, sLP. Participant 3 would perform aPU, PU, sLP, and finally kLP. Participant 4 would perform PU, sLP, kLP, and finally aPU. Participant 5 would perform the exercises in the same order as Participant 1. A recovery period of 5 minutes was given to subjects between each exercise.Data Analysis For analysis, participants’ data were grouped based off of the reported max pull-up number (i.e. under 10 reps (u10) and 10 and over reps (10+)). Raw EMG data were sampled at 2000 Hz using a Butterworth filter with corner frequencies of 20-450Hz and a slope of 12db/oct. Data was then smoothed using the root mean square (RMS) Trigno software calculation (Delsys EMG Works Analysis software). The peak EMG magnitudes were recorded for the 5-second MVIC bout for each muscle and the 2nd, 3rd and 5th repetitions of each exercise. The peak magnitudes were then averaged for the 3 repetitions. Mean peak magnitudes for each muscle are represented as percentages of MVIC (%MVIC). Statistical Analysis Pearson correlation coefficients were used to determine the strength of the relationship of the activity in each of the 4 muscle groups of interest for the PU and each individual alternative pulling exercise (sLP, kLP and aPU) for the two groups. Coefficient of determination (r2) was then used to determine the extent that the magnitude of activity in the respective alternative exercise explained the magnitude of activity in the PU. An alpha level of p ≤ 0.05 was set for the level of significance for all statistical analyses. Sigma Stat 4.0 for Windows (Systat Software, Inc., San Jose, CA) was used to perform all statistical analyses. Results Of the four muscle groups tested, the greatest (normalized) magnitudes of muscle activity observed during the PU for the u10 group were: RA (1.58 ± 0.94), BI (1.54 ± 0.52), LAT (1.20 ± 0.67), and finally TRAP (0.93 ± 0.56) see Table 2. The k-LP was the only alternative pulling exercise observed to have the same activation pattern. In contrast, the 10+ group had the greatest magnitude of action in the BI (1.22 ± 0.45) followed by the RA (1.02 ± 0.75), LAT (0.96 ± 0.42) and finally the TRAP (0.74 ± 0.65). None of the alternative pulling exercises were observed to have the same magnitude of activation pattern as the pull-up. For the u10 Reps group, Pearson Correlation Coefficient indicated very strong relationships between the magnitude of RA activity in the PU and both the s-LP and k-LP (r = 0. 90, p<0.001), as well as between BI activity in the PU and both the s-LP and k-LP (r = 0.91 and 0.89, respectively, p<0.001) and the LAT activity in the PU and k-LP (r = 0.90, p<0.001) see Table 2. Moderate to low relationships in the TRAP were observed between the PU and all three alternative exercises (r = 0.35 to 0.69, p = 0.01 to 0.221). The greatest shared variance of the muscles and exercises of interest were observed in the RA between the PU and k-LP, and PU and s-LP (r2 = 0.81), BI between the PU and s-LP, and PU and k-LP (r2 = 0.83 and 0.79, respectively), and the LAT between the PU and k-LP (r2 = 0.81). The correlational analysis for the 10+ Reps group revealed very strong relationships between the TRAP activity for the PU and aPU (r = 0.95, p<0.001) as well as the BI activity for the PU and k-LP (r = 0.85, p<0.001). Moderate to low relationships were observed for all other magnitudes and exercises. The greatest shared variance was observed in the TRAP between the PU and aPU (r2 = 0.90) see Table 2. [Click here to view Large Table 2] Discussion and Conclusion This study sought to investigate whether muscle activation patterns are similar between the traditional body weight pullup and various alternative pulling exercises often used to train for improved performance in the pull-up. Of the four muscle groups assessed, the RA was the most active muscle group for all participants when performing the PU. High activation levels of the core musculature are not surprising as this muscle group helps to maintain a rigid body position throughout the PU. Previous research has supported this notion when assessing RA activity during various other movements that require core stabilization (e.g. supine v-up, prone suspension exercises, push-ups, squats, etc.) wherein, the RA are activated to a greater extent as the performance surface becomes less stable. Anderson and Behm [16], Cugliari and Boccia [17], Garg and Sharma [18], Snarr, Esco, Witte, Jenkins, & Brannan [19], Snarr, Hallmark and Esco [20] Van den Tillaar and Saeterbakken [21]. The PU is performed while being suspended from a bar, and therefore requires greater stabilization of the core throughout the execution of the exercise, than would be required if performed from a solid base of support (e.g. seated lat pulldown). Of the three alternative pulling exercises, only the k-LP replicated the order of activation pattern for the u10 Rep group (from greatest to least active); RA, BI, LAT, and TRAP. This indicates that as participants near their maximal effort during both the PU and alternative pulling exercise, only the k-LP activate these four muscle groups to relatively the same extent as that of the PU. This inference is further supported by the relatively high shared variance between the PU and k-LP for the RA muscle group. Additionally, when performing the k-LP, participants were pulling a load that was equal to 80% of their body weight. As a result, the participants were lifted off of the ground for a portion of the pulling (concentric) phase of the movement, similar to the suspension aspect of the pull-up. Unfortunately, there is a lack of research in this area, and therefore it is difficult to determine if the data presented in the current study is an accurate representation of a larger population. In contrast to the u10 Rep group, aside from the RA (most active for all exercises) none of the activation patterns for the alternative pulling exercises for the 10+ Reps group replicated that of the PU see Figure 6. As only 5 reps were performed by each participant, those that self-reported to be able to perform at least 10 reps would have performed at a submaximal level for each of these exercises. As such, it is likely that as the performance nears maximal effort, the activation patterns shift to accommodate the more challenging load. Discussion and Conclusion This study sought to investigate whether muscle activation patterns are similar between the traditional body weight pullup and various alternative pulling exercises often used to train for improved performance in the pull-up. Of the four muscle groups assessed, the RA was the most active muscle group for all participants when performing the PU. High activation levels of the core musculature are not surprising as this muscle group helps to maintain a rigid body position throughout the PU. Previous research has supported this notion when assessing RA activity during various other movements that require core stabilization (e.g. supine v-up, prone suspension exercises, push-ups, squats, etc.) wherein, the RA are activated to a greater extent as the performance surface becomes less stable. Anderson and Behm [16], Cugliari and Boccia [17], Garg and Sharma [18], Snarr, Esco, Witte, Jenkins, & Brannan [19], Snarr, Hallmark and Esco [20] Van den Tillaar and Saeterbakken [21]. The PU is performed while being suspended from a bar, and therefore requires greater stabilization of the core throughout the execution of the exercise, than would be required if performed from a solid base of support (e.g. seated lat pulldown). Of the three alternative pulling exercises, only the k-LP replicated the order of activation pattern for the u10 Rep group (from greatest to least active); RA, BI, LAT, and TRAP. This indicates that as participants near their maximal effort during both the PU and alternative pulling exercise, only the k-LP activate these four muscle groups to relatively the same extent as that of the PU. This inference is further supported by the relatively high shared variance between the PU and k-LP for the RA muscle group. Additionally, when performing the k-LP, participants were pulling a load that was equal to 80% of their body weight. As a result, the participants were lifted off of the ground for a portion of the pulling (concentric) phase of the movement, similar to the suspension aspect of the pull-up. Unfortunately, there is a lack of research in this area, and therefore it is difficult to determine if the data presented in the current study is an accurate representation of a larger population. In contrast to the u10 Rep group, aside from the RA (most active for all exercises) none of the activation patterns for the alternative pulling exercises for the 10+ Reps group replicated that of the PU see Figure 6. As only 5 reps were performed by each participant, those that self-reported to be able to perform at least 10 reps would have performed at a submaximal level for each of these exercises. As such, it is likely that as the performance nears maximal effort, the activation patterns shift to accommodate the more challenging load.  For more Open Access Journals in Juniper Publishers please click on: https://juniperpublishers.com For more articles in Journal of Physical Fitness, Medicine & Treatment in Sports please click on: https://juniperpublishers.com/jpfmts/index.php For more Open Access Journals please click on: https://juniperpublishers.com

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We are a professional moving company servicing both commercial and residential customers all over New England. With hundreds of satisfied customers we are confident we can provide you a stress free move. Large or small moves, we treat every customer like a VIP. Curious what people are saying? Check out our testimonials page!

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