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Analysis of Pushing Exercises: Muscle Activity and Spine Load While Contrasting Techniques on Stable Surfaces with a Labile Susp

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Analysis of Pushing Exercises: Muscle Activity and Spine Load While Contrasting Techniques on Stable Surfaces with a Labile Susp ANALYSIS OF PUSHING EXERCISES:MUSCLE ACTIVITY AND SPINE LOAD WHILE CONTRASTING TECHNIQUES ON STABLE SURFACES WITH A LABILE SUSPENSION STRAP TRAINING SYSTEM STUART M. MCGILL,JORDAN CANNON, AND JORDAN T. ANDERSEN Department of Kinesiology, Spine Biomechanics Laboratory, University of Waterloo, Waterloo, Canada ABSTRACT was a range of compression; the TRX push-up ranged from McGill, SM, Cannon, J, and Andersen, JT. Analysis of pushing 1,653 to 2,128.14 N, whereas the standard push-up had exercises: Muscle activity and spine load while contrasting a range from 1,233.75 to 1,530.06 N. There was no significant techniques on stable surfaces with a labile suspension strap effect of exercise on spine compression (F(4,60) = 0.86, p = training system. J Strength Cond Res 28(1): 105–116, 2014— 0.495). Interestingly, a standard push-up showed significantly Labile surfaces in the form of suspension straps are increas- greater shear than TRX angle 1 (p = 0.02), angle 2 (p = 0.01), ingly being used as a tool in resistance training programs. and angle 3 (p = 0.02). As with any training program for the Pushing is a common functional activity of daily living and inher- elite or recreational athlete alike, specific exercises and pro- ently part of a well-rounded training program. This study exam- grams should reflect one’s injury history, capabilities, limita- ined pushing exercises performed on stable surfaces and tions, and training goals. Although none of the exercises unstable suspension straps, specifically muscle activation lev- examined here breached the NIOSH action limit for compres- els and spine loads were quantified together with the influence sion, those exercises that produced higher loads should be of employing technique coaching. There were several main used relative to the individual. Thus, the atlas of muscle activa- questions that this study sought to answer: Which exercises tion, compression, and shear forces provided can be used to challenged particular muscles? What was the magnitude of the create an appropriate program. Those individuals not able to resulting spine load? How did stable and unstable surfaces tolerate certain loads may refer to the atlas and choose exer- differ? Did coaching influence the results? Fourteen men were cises that minimize load and still provide sufficient muscle acti- recruited as part of a convenience sample (mean age, 21.1 6 vation. Conversely, an individual with a resilient back that 2.0 years; height, 1.77 6 0.06 m; mean weight, 74.6 6 7.8 requires an increased muscular challenge may choose exer- kg). Data were processed and input to a sophisticated and cises with higher muscle activation and spine load. This helps anatomically detailed 3D model that used muscle activity and the individual, trainer, or coach in program design respecting body segment kinematics to estimate muscle force—in this way, individual differences and training goals. the model was sensitive to the individuals choice of motor KEY WORDS push exercises on serratus anterior activation, control for each task; muscle forces and linked segment joint stable vs. labile push exercises, coaching and muscle activation loads were used to calculate spine loads. Exercises were per- formed using stable surfaces for hand/feet contact and INTRODUCTION repeated where possible with labile suspension straps. Speed ocomotion, level changes of one’s center of mass, of movement was standardized across participants with the pushing and pulling, and rotation were noted as 4 use of a metronome for each exercise. There were gradations major categories of human movement (14). Pushing, of muscle activity and spine load characteristics to every task. L the focus of this study, is a common functional daily In general, the instability associated with the labile exercises activity, together with being inherent in any well-rounded required greater torso muscle activity than when performed on training program. Given the need to provide guidance to those stable surfaces. Throughout the duration of an exercise, there who must prepare pushing ability, we were motivated to inves- tigate some basic mechanics of pushing. Address correspondence to Stuart McGill, [email protected]. The muscles of the torso generate force to create three- 28(1)/105–116 dimensional (3D) moments that both initiate and prevent Journal of Strength and Conditioning Research motion and contribute stiffness to stabilize the spine. Ó 2013 National Strength and Conditioning Association Stiffness and hence stability enhances 2 elements: (a) a stiffer VOLUME 28 | NUMBER 1 | JANUARY 2014 | 105 Copyright © National Strength and Conditioning Association Unauthorized reproduction of this article is prohibited. Analysis of Pushing Exercises lower-body power movements from suspension training war- rant an investigation into the de- mands of such exercises. The objective of this study was to investigate some mechanisms associated with various pushing exercises by quantifying muscle activation patterns and calculat- ing the resultant spine load using both stable and labile contact surfaces. In this primarily descriptive study, 3 specific is- sues were investigated: 1. The influence of different push exercises on serratus anterior activation, where it was hypothesized that sus- pension strap exercises would elicit higher activation than stable surface exercises. 2. Comparison of muscle and joint load demands resulting from stable (i.e., from a fixed surface) vs. labile (i.e., using a suspension strap training system) for pushing exercises; it was hypothesized that labile straps would increase muscle activity and spine load. 3. The influence of coaching on the outcome measure of muscle activation; it was Figure 1. Experimental setup with instrumentation of electromyography electrodes to obtain muscle activation hypothesized that coaching values, force plate to obtain force input to the linkage through the feet, and reflective markers used to obtain 3 dimensional body segment kinematics. would result in more neutral spine postures and thus lower tissue stress. spine is more resilient to buckling allowing it to safely bear METHODS more load and (b) proximal stiffness, i.e., stiffness proximal to Experimental Approach to the Problem the shoulder and hip, fixates the proximal attachment of An overview of the methods is as follows: 14 men performed muscles, so their mechanical effect is focused on the distal several pushing tasks while muscle activity, external force, attachment creating faster limb movements with more and 3D body segment motion including spine posture were power in the arms and legs. Pushing exercises have been shown to qualify as a justifiable torso training exercise to recorded. Forces at the hands (through a force transducer) meet these objectives (7). and feet (through force plates) were collected. These data The use of labile (movable) surfaces contacting the feet or were processed and input to a sophisticated and anatomi- hands of the subject is becoming more popular (1,13). In cally detailed 3D model that used muscle activity and body particular, suspension straps are used in training centers segment kinematics to estimate muscle force—in this way, and adapted to create resistance training in a wide variety the model was sensitive to the individual choice of motor of challenges. Closed chain exercises (in which the terminal control selected by each person and for each task; muscle segments are fixed) in a suspension strap have been postu- lated to improve specific areas of athletic performance with- forces and linked segment joint loads were used to calculate out any detriment to strength, compared with traditional spine loads; pushing exercises were performed using stable open chain exercises (13). Improvements in upper- and surfaces for hand/feet contact and repeated where possible 106 Journalthe of Strength and Conditioning ResearchTM Copyright © National Strength and Conditioning Association Unauthorized reproduction of this article is prohibited. the TM Journal of Strength and Conditioning Research | www.nsca.com Figure 2. A) Standard push-up. B) Stable shoulder protraction. C) TRX shoulder protraction. D, E, F) TRX pushes at angles 1, 2, and 3. G) TRX scapula push- up. H) Reverse fly. with labile surface contact (TRX suspension straps; TRX (REO)—approximately 3 cm lateral to the linea semilunaris Fitness Anywhere, San Francisco, CA, USA). at the same level as the RRA electrodes; internal oblique Subjects (RIO)—at the level of the anterior superior iliac spine (ASIS) Fourteen male subjects, mean (SD) age, 21.1 years (2.0); height, and medial to the linea semilunaris, but superior to the ingui- 1.77 m (0.06); weight, 74.6 kg (7.8), recruited from the university nal ligament; latissimus dorsi (RLD)—inferior to the scapula population comprised a convenience sample for this study over the muscle belly when the arm was positioned in the (range from 18 - 24 years old). They were healthy with no shoulder mid-range; upper (thoracic) erector spinae (RUES) previous history of disabling back pain. All were familiar with —5 cm lateral to the spinous process of T9; lumbar erector resistance training techniques. Participants completed a written spinae (RLES)—3 cm lateral to the spinous process of L3; informed consent document approved by the University Office rectus femoris (RRF)—midway between the patella and the for Research Ethics. ASIS over the belly of the muscle; gluteus maximus (RGMAX)—approximately 6 cm lateral to the intergluteal Instrumentation cleft; gluteus medius (RGMED)—approximately
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