EMG Studies: spiergroepen vs oefeningen

[3XL]

Origineel gepost door ian

ik vraag me af hoe deze test zijn gedaan.

Methods:
We recruited four healthy volunteer athletes, two men and two woman. Al the subjects had at least four years experience in strength training and had not used performance-enhancing substances for at least one year.

We tested them on two separate days.

On the first day we determined their one-rep maxes for the exercises
Each athlete performed a warmup of four reps at 50 percent of one rep max, three reps at 80 percent and two reps at 90 percent, with a five-minute rest after each set. The atletes then performed three one-rep maxes for the exercise taking a five minute rest after each trial

On the second day the subjects dis 80% of one-rep maxes five times, interspersed with three minute rest intervals.

We measured electrmyographic activity during all exercises. All EMG data was rectifeid and integrated for one second, wich is referred to as IEMG.

We designated the exercise that yielded the highest IEMG determined at one-rep maximum as IEMG max for the .......(edit:vul hier de betreffende spier in) and we determined IEMG max bij taking the average of the three rep maxes for each exercise.

We expressed IEMG values obtained during 80 percent of one-rep max sets as a percentage of one-rep IEMG max and we determined IEMG at 80 percent of one-rep maxes the average of the five 80 percent trials.

[ian]

ik vind dat je dit onderzoek niet serieus kan nemen omdat er maar 4 proefpersonen zijn gebruikten de wetenschappelijke referenties zijn allemaal rond de twintig jaar oud.

[Big T]

Niet serieus? aantal deelnemers maakt geen donder uit want men vergelijkt de oefeningen, niet de deelnemers onderling, daarom is het aantal juist laag, omdat het geen belang heeft. Als bij 4 mensen eenzelfde patroon kan herkent worden dan mag je uitgaan van betrouwbare resultaten. Ouderdom van studie heeft ook geen belang, mensen zijn nog steeds mensen en wetenschap was toen voldoende ontwikkeld om deze studie goed uit te voeren. Er worden in allerlei toepassingen oude studies aangehaald, zelfs bij medicijnen die mensen vandaag nog slikken, zolang de studie klopt is er niets aan de hand.

[Mars]

Opzich klopt het wel allemaal.

[Sephirothsnake]

K zou graag de EMG van de uprightrow eens zien. een van mijn favs

Wel interessant.

[3XL]

Ik dacht dat dit onderzoek wat data bevat

"EMG analysis of the scapular muscles during a shoulder rehabilitation program" Moseley JB Jr, Jobe FW, Pink M, Perry J, Tibone J

Mar heb helaas de full text niet voort je (mischien iemand anders?)

[Dave Hawk]

Origineel gepost door RubenSossa

Ik mis wel wat heel belangrijke oefeningen, zoals Glute/Ham raises, normale Dips, Standing Military presses en Pullups!

Dippen mis ik ook in dit geheel, iemand een helder inzicht welke borst-spieren hier specifiek mee gepakt worden . Altijd leuk die theorie erachter .

[Dave Hawk]

Origineel gepost door Dave Hawk

Dippen mis ik ook in dit geheel, iemand een helder inzicht welke borst-spieren hier specifiek mee gepakt worden . Altijd leuk die theorie erachter .

Ff wat check werk gedaan
Wanneer men dipt als bortsoefening (dus iets meer voorover hangt), pak je
de pectoralis Major en Minor als hoofdgroep.

[rnbflavour]

Origineel gepost door Dave Hawk

Ff wat check werk gedaan
Wanneer men dipt als bortsoefening (dus iets meer voorover hangt), pak je
de pectoralis Major en Minor als hoofdgroep.

vooral het onderste gedeelte van de major [de vezelf die niet meer aa het borstbeen vastzitten] en de pec minor.

hou je schouders stil dan worden ze gebruikt als stabilisatoren.

beweeg je je schouders mee op en neer dan worden het synergisten

[rnbflavour]

hmm btw....verander pectoralis minor ff in gewoon bovenkant borst om verwarring te voorkomen... stond ff heel raar te kijken...dat je met incline de pec minor belast

[3XL]

? ? ? ?

Kan je even niet volgen ? Dippen is een decline bewegingen op het moment dat je de schouders naar voor/onder rolt om de beweging te eindigen belast je de minor

[3XL]

An EMG Comparison Study of a Leg Press and a Squat Lift

Melissa James MPT, Heidi Ivesdal, Thomas Mohr PT, PhD, John Frappier MS
Dept. of Physical Therapy, University of North Dakota, Grand Forks, ND

Abstract:
Purpose. The purpose of this study was to compare muscle recruitment during a leg press and a traditional squat lift. Subjects. Two groups of subjects were used for this study. Group 1 consisted of ten, healthy, normal males. Group 2 consisted of sixteen, healthy, trained, male athletes. Methods. Surface electromyographic (EMG) activity was recorded from the erector spinae (ES), gluteus maximus (GM), vastus lateralis (VL), and biceps femoris (BF) muscles. The exercises performed were a leg press (Plyo-Press), and a traditional squat lift. Each subject in Group 1 performed three repetitions of each exercise using a weight equivalent to their body weight (155 to 265 lbs). Each subject in Group 2 performed three repetitions of each exercise using a weight equivalent to 80% of their 1 RM (225 to 600 lbs). Results. In the trained group (Group 2), the squat exercise elicited significantly more EMG activity than did the leg press in the ES, GM and BF. There was no significant difference in the VL activity between the two exercises. In the normal group (Group 1), the results were similar in that the squat exercise also elicited significantly more EMG activity in the ES, GM and BF. In the normal group there was no significant difference in the VL activity between the two exercises. Conclusion. In this study, the leg press provided the same level of muscle recruitment in the VL as did the squat exercise. However, the leg press did not recruit the ES, GM or BF to the extent that the squat exercise did. Therefore, we hypothesize that the leg press machine may be better for individuals who want to specifically strengthen their quadriceps musculature, but reduce the strain on the low back that may be caused by the excessive activity of the ES musculature.

Purpose:
It has been suggested that traditional squat lifting with free weights may put strain on the low back because of the increased muscle activity in the low back musculature that occurs during the lift. Furthermore, it has been proposed that the leg press will activate the quadriceps muscles to the same extent as the squat lift without excessive activation of the low back musculature. However, there is little research to support these claims. Therefore, the purpose of this study was to compare muscle recruitment during a leg press and a traditional squat lift. It has been suggested that traditional squat lifting with free weights may put strain on the low back because of the increased muscle activity in the low back musculature that occurs during the lift. Furthermore, it has been proposed that the leg press will activate the quadriceps muscles to the same extent as the squat lift without excessive activation of the low back musculature. However, there is little research to support these claims. Therefore, the purpose of this study was to compare muscle recruitment during a leg press and a traditional squat lift.

Methods:
Subjects. Two groups of subjects were used for this study. Group 1 consisted of ten, healthy, normal males. Group 2 consisted of sixteen, healthy, trained, male athletes. The subjects in Group 1 were chosen because they were able to squat lift a weight equivalent to 75% of their body weight. The subjects in Group 2 were chosen because they were able to squat lift a weight equivalent to 80% of their 1 RM. Instrumentation. The EMG data was recorded using the Noraxon Telemyo8 transmitter/receiver and analyzed using the MyoSoft software package. Procedure. Surface electromyographic (EMG) activity was recorded from the erector spinae (ES), gluteus maximus (GM), vastus lateralis (VL), and biceps femoris (BF) muscles. The exercises performed were: 1) a leg press using the Plyo-Press® device, and 2) a traditional squat lift using free weights. Each subject in Group 1 performed three repetitions of each exercise using a weight equivalent to their body weight (155 to 265 lbs). Each subject in Group 2 performed three repetitions of each exercise using a weight equivalent to 80% of their 1 RM (225 to 600 lbs). Data Analysis. The EMG activity was normalized based on a maximal voluntary contraction (MVC) for each muscle. A comparison was made of the normalized EMG values, recorded for each muscle, during the two exercises using paired t-tests. Alpha levels of 0.05 were used to test for significance.

Results:
In the trained group (Group 2), the squat exercise elicited significantly more EMG activity than did the leg press in the ES, GM and BF. However, there was no significant difference in the VL activity between the two exercises (Table 1). In the normal group (Group 1), the results were similar in that the squat exercise also elicited significantly more EMG activity in the ES, GM and BF (Table 2). As with the trained group, there was no significant difference in the VL activity between the two exercises.

CONCLUSION:
The leg press provides the same level of muscle recruitment in the VL as does a squat exercise. However, the leg press does not recruit the ES, GM or BF to the extent that the squat exercise does. Therefore, we hypothesize that the leg press machine may be better for individuals who want to specifically strengthen their quadriceps musculature, but reduce possible strain on the low back that may be caused by the excessive activity of the ES musculature. However, if the training is aimed at training the ES, GM or BF; then the squat lift may provide a better training stimulus

voor de tabellen An EMG Comparison Study of a Leg Press and a Squat Lift

[rnbflavour]

Origineel gepost door 3XL

? ? ? ?

Kan je even niet volgen ? Dippen is een decline bewegingen op het moment dat je de schouders naar voor/onder rolt om de beweging te eindigen belast je de minor

wat snap je niet?

wat ik bedoel is dat sommige mensen tijdens het dippen alleen de ellebogen proberen te laten te bewegen

en dat sommigen helemaal hun schouders omhoog laten komen tot in hun nek zeg maar.


bij het eerste punt gebruik je dus de pec minor statisch om de schouder op zen plek te houden dus als stabilisator

bij de 2de zorg je door middel van concentrische en exentrische contractie van de pec minor ervoor dat de schouder tijdens de beweging omhoog en omlaag gaat


dit is wat ik denk tenminste als ik kijk naar origo en insertie van de pec minor

[rnbflavour]

Origineel gepost door 3XL

An EMG Comparison Study of a Leg Press and a Squat Lift

Melissa James MPT, Heidi Ivesdal, Thomas Mohr PT, PhD, John Frappier MS
Dept. of Physical Therapy, University of North Dakota, Grand Forks, ND

Abstract:
Purpose. The purpose of this study was to compare muscle recruitment during a leg press and a traditional squat lift. Subjects. Two groups of subjects were used for this study. Group 1 consisted of ten, healthy, normal males. Group 2 consisted of sixteen, healthy, trained, male athletes. Methods. Surface electromyographic (EMG) activity was recorded from the erector spinae (ES), gluteus maximus (GM), vastus lateralis (VL), and biceps femoris (BF) muscles. The exercises performed were a leg press (Plyo-Press), and a traditional squat lift. Each subject in Group 1 performed three repetitions of each exercise using a weight equivalent to their body weight (155 to 265 lbs). Each subject in Group 2 performed three repetitions of each exercise using a weight equivalent to 80% of their 1 RM (225 to 600 lbs). Results. In the trained group (Group 2), the squat exercise elicited significantly more EMG activity than did the leg press in the ES, GM and BF. There was no significant difference in the VL activity between the two exercises. In the normal group (Group 1), the results were similar in that the squat exercise also elicited significantly more EMG activity in the ES, GM and BF. In the normal group there was no significant difference in the VL activity between the two exercises. Conclusion. In this study, the leg press provided the same level of muscle recruitment in the VL as did the squat exercise. However, the leg press did not recruit the ES, GM or BF to the extent that the squat exercise did. Therefore, we hypothesize that the leg press machine may be better for individuals who want to specifically strengthen their quadriceps musculature, but reduce the strain on the low back that may be caused by the excessive activity of the ES musculature.

Purpose:
It has been suggested that traditional squat lifting with free weights may put strain on the low back because of the increased muscle activity in the low back musculature that occurs during the lift. Furthermore, it has been proposed that the leg press will activate the quadriceps muscles to the same extent as the squat lift without excessive activation of the low back musculature. However, there is little research to support these claims. Therefore, the purpose of this study was to compare muscle recruitment during a leg press and a traditional squat lift. It has been suggested that traditional squat lifting with free weights may put strain on the low back because of the increased muscle activity in the low back musculature that occurs during the lift. Furthermore, it has been proposed that the leg press will activate the quadriceps muscles to the same extent as the squat lift without excessive activation of the low back musculature. However, there is little research to support these claims. Therefore, the purpose of this study was to compare muscle recruitment during a leg press and a traditional squat lift.

Methods:
Subjects. Two groups of subjects were used for this study. Group 1 consisted of ten, healthy, normal males. Group 2 consisted of sixteen, healthy, trained, male athletes. The subjects in Group 1 were chosen because they were able to squat lift a weight equivalent to 75% of their body weight. The subjects in Group 2 were chosen because they were able to squat lift a weight equivalent to 80% of their 1 RM. Instrumentation. The EMG data was recorded using the Noraxon Telemyo8 transmitter/receiver and analyzed using the MyoSoft software package. Procedure. Surface electromyographic (EMG) activity was recorded from the erector spinae (ES), gluteus maximus (GM), vastus lateralis (VL), and biceps femoris (BF) muscles. The exercises performed were: 1) a leg press using the Plyo-Press® device, and 2) a traditional squat lift using free weights. Each subject in Group 1 performed three repetitions of each exercise using a weight equivalent to their body weight (155 to 265 lbs). Each subject in Group 2 performed three repetitions of each exercise using a weight equivalent to 80% of their 1 RM (225 to 600 lbs). Data Analysis. The EMG activity was normalized based on a maximal voluntary contraction (MVC) for each muscle. A comparison was made of the normalized EMG values, recorded for each muscle, during the two exercises using paired t-tests. Alpha levels of 0.05 were used to test for significance.

Results:
In the trained group (Group 2), the squat exercise elicited significantly more EMG activity than did the leg press in the ES, GM and BF. However, there was no significant difference in the VL activity between the two exercises (Table 1). In the normal group (Group 1), the results were similar in that the squat exercise also elicited significantly more EMG activity in the ES, GM and BF (Table 2). As with the trained group, there was no significant difference in the VL activity between the two exercises.

CONCLUSION:
The leg press provides the same level of muscle recruitment in the VL as does a squat exercise. However, the leg press does not recruit the ES, GM or BF to the extent that the squat exercise does. Therefore, we hypothesize that the leg press machine may be better for individuals who want to specifically strengthen their quadriceps musculature, but reduce possible strain on the low back that may be caused by the excessive activity of the ES musculature. However, if the training is aimed at training the ES, GM or BF; then the squat lift may provide a better training stimulus

voor de tabellen An EMG Comparison Study of a Leg Press and a Squat Lift

kijk zulke dingen hebben we nodig.

met een beetje gezond verstand kun je inderdaad bedenken dat de uitkomst zo zou zijn.

toch vind ik de leg press bij mijn eigen training een goeie aanvulling, omdat je jezelf dan niet zoveel meer hoeft te stabiliseren en minder tot geen last hebt van vermoeidheid van de ES, GM en BF

ik zal je tabel morgen ook even toevoegen aan de topic van de week

[DutchVince]

Het volgende arm-programma is gebaseerd op EMG studies.
Build Big Arms with Compound Aftershock

Is het wat of is het niks?

[rnbflavour]

Origineel gepost door DutchVince

Het volgende arm-programma is gebaseerd op EMG studies.
Build Big Arms with Compound Aftershock

Is het wat of is het niks?

eey thnx bro staat goed spul in wat ik kan gebruiken voor topic van de week morgen zijn armen namelijk aan de beurt

[3XL]

Is dus gewoon een variant op het orginel Compound aftershock wat weer gebaseert is op POF (Steve Holman) waar je eerst een strech oefening doet, gevolgd door een "compound" oefening.

Iron Man Magazine @ ironmanmagazine.com

Weer iets wat voor verwarring gaat zorgen

[rnbflavour]

Origineel gepost door 3XL

Is dus gewoon een variant op het orginel Compound aftershock wat weer gebaseert is op POF (Steve Holman) waar je eerst een strech oefening doet, gevolgd door een "compound" oefening.

Iron Man Magazine @ ironmanmagazine.com

Weer iets wat voor verwarring gaat zorgen

POF is dus stretch en dan oefening waarbij je de spier maximaal verkort

en compound aftershok is dus stretch en daarna een compound...begrijp ik het zo goed?

[3XL]

Ja, in een "normale POF routine doe je eerst een "synergie" oefening en dan een strechoefening.

Bij de compoundaftershock avn Holman doe je eerst de strechoefening en dan de "synergie" oefening

[thomanator]

Ik heb zelf een keer aan zo'n emg apparaat gezeten en hoewel ik toen niet veel verschillende spieren of oefeningen heb kunnen testen, werd wel heel duidelijk dat de activiteit tijdens een snelle contractie veel hoger was dan bij een langzame. Ook met weerstand.
Dit bevestigd volgens mij dat je meer spiervezels aanspreekt als je een oefening explosief uitvoert.