Stance width and bar load effects on leg muscle activity during the parallel squat.

**3XL** · 11 April 2008, 18:37

Stance width and bar load effects on leg muscle activity during the parallel squat.
Applied Sciences

Medicine & Science in Sports & Exercise. 31(3):428-436, March 1999.
McCAW, STEVEN T.; MELROSE, DONALD R.
Abstract:
Stance width and bar load effects on leg muscle activity during the parallel squat. Med. Sci. Sports Exerc., Vol. 31, No. 3, pp. 428-436, 1999.

Purpose: Altering foot stance is often prescribed as a method of isolating muscles during the parallel squat. The purpose of this study was to compare activity in six muscles crossing the hip and/or knee joints when the parallel squat is performed with different stances and bar loads.

Methods: Nine male lifters served as subjects. Within 7 d of determining 1RM on the squat with shoulder width stance, surface EMG data were collected (800 Hz) from the rectus femoris, vastus medialis, vastus lateralis, adductor longus, gluteus maximus, and biceps femoris while subjects completed five nonconsecutive reps of the squat using shoulder width, narrow (75% shoulder width), and wide (140% shoulder width) stances with low and high loads (60% and 75% 1RM, respectively). Rep time was controlled. A goniometer on the right knee was used to identify descent and ascent phases. Integrated EMG values were calculated for each muscle during phases of each rep, and the 5-rep means for each subject were used in a repeated measures ANOVA (phase x load x stance, [alpha] = 0.05).

Results:
For rectus femoris, vastus medialis, and vastus lateralis, only the load effect was significant. Adductor longus exhibited a stance by phase interaction and a load effect. Gluteus maximus exhibited a load by stance interaction and a phase effect. Biceps femoris activity was highest during the ascent phase.

Conclusion: The results suggest that stance width does not cause isolation within the quadriceps but does influence muscle activity on the medial thigh and buttocks.(C) 1999 Lippincott Williams & Wilkins, Inc.

FLX · 11 April 2008, 18:43

Alien · 11 April 2008, 18:50

pff eerst even al die latijnse namen opzoeken

kweet da ik aan de adductor longus geblesseerd raak als ik dieper dan parallel probeer

Maiskorrel · 11 April 2008, 20:33

Is een onderzoek van bijna 10 jaar geleden

nbatweek · 12 April 2008, 10:35

Ok op de quadriceps heeft het geen effect, maar welke stance spreekt je gluteus nu het meeste aan?

**3XL** · 12 April 2008, 14:43

Citaat:

Origineel gepost door Maiskorrel

Is een onderzoek van bijna 10 jaar geleden

Ja en? Gebruiken ze tegenwoordig andere spieren bij dezelfde bewegingen als 10jaar geleden?

11 April 2008, 18:37	#1
3XL Super Moderator Geregistreerd: Apr 2002 Locatie: افغانستان Geslacht: V Posts: 10.465 Karma Power: 26	Stance width and bar load effects on leg muscle activity during the parallel squat. Stance width and bar load effects on leg muscle activity during the parallel squat. Applied Sciences Medicine & Science in Sports & Exercise. 31(3):428-436, March 1999. McCAW, STEVEN T.; MELROSE, DONALD R. Abstract: Stance width and bar load effects on leg muscle activity during the parallel squat. Med. Sci. Sports Exerc., Vol. 31, No. 3, pp. 428-436, 1999. Purpose: Altering foot stance is often prescribed as a method of isolating muscles during the parallel squat. The purpose of this study was to compare activity in six muscles crossing the hip and/or knee joints when the parallel squat is performed with different stances and bar loads. Methods: Nine male lifters served as subjects. Within 7 d of determining 1RM on the squat with shoulder width stance, surface EMG data were collected (800 Hz) from the rectus femoris, vastus medialis, vastus lateralis, adductor longus, gluteus maximus, and biceps femoris while subjects completed five nonconsecutive reps of the squat using shoulder width, narrow (75% shoulder width), and wide (140% shoulder width) stances with low and high loads (60% and 75% 1RM, respectively). Rep time was controlled. A goniometer on the right knee was used to identify descent and ascent phases. Integrated EMG values were calculated for each muscle during phases of each rep, and the 5-rep means for each subject were used in a repeated measures ANOVA (phase x load x stance, [alpha] = 0.05). Results: For rectus femoris, vastus medialis, and vastus lateralis, only the load effect was significant. Adductor longus exhibited a stance by phase interaction and a load effect. Gluteus maximus exhibited a load by stance interaction and a phase effect. Biceps femoris activity was highest during the ascent phase. Conclusion: The results suggest that stance width does not cause isolation within the quadriceps but does influence muscle activity on the medial thigh and buttocks.(C) 1999 Lippincott Williams & Wilkins, Inc. __________________ As you are now, I once was. As I am now, you'll never be ©3XL ®2000 The only easy day was yesterday...............Life is hard, so am I Geloof niets, probeer alles

11 April 2008, 18:43	#2
FLX Competitive Bodybuilder Geregistreerd: Jun 2006 Locatie: Nederland Geslacht: M Posts: 2.219 Karma Power: 9	__________________ 'Opgeven is de makkelijkste oefening' Zeg maar Lex ipv FLX..

11 April 2008, 18:50	#3
Alien Competitive Bodybuilder Geregistreerd: Jun 2003 Locatie: België Leeftijd: 26 Geslacht: M Posts: 1.863 Karma Power: 8	pff eerst even al die latijnse namen opzoeken kweet da ik aan de adductor longus geblesseerd raak als ik dieper dan parallel probeer __________________ STRIAE....YOU CALL THAT STRIAE....THIS IS STRIAE ________________ Start cut 101.2kg@18% 1.85m na 5weken 98.2kg @ 14.1% Doel: 90kg 10% ??? we'll see, i think we are going to end better :D <<<<ECTO TRAPPED IN A FAT MAN'S BODY>>>>

11 April 2008, 20:33	#4
Maiskorrel Freaky Bodybuilder Geregistreerd: Apr 2007 Locatie: Lier Leeftijd: 23 Geslacht: M Posts: 6.793 Karma Power: 43	Is een onderzoek van bijna 10 jaar geleden __________________ 1.75m @ 91kg bf 19 % ORIGINAL POSTED BY EL SMURFO: Ik ga iets versturen met de post, iets kleins van 5 euro ofzo voor iemand haar verjaardag, prijs eraan laten of niet? als ik het ervan knip zou ze misschien denkek dat ik het gestolen heb maar als ik de prijs eraan laat zou ze misschien denken dat ik het wil benadrukken dat ik 5 euro heb uitgegeven ofzo

12 April 2008, 10:35	#5
nbatweek Advanced Bodybuilder Geregistreerd: Feb 2007 Locatie: hongaarse steppe van nederland Leeftijd: 23 Geslacht: M Posts: 801 Karma Power: 4	Ok op de quadriceps heeft het geen effect, maar welke stance spreekt je gluteus nu het meeste aan? __________________ Pumping Iron: "Proud member of the DBB Big Ass Lover Club"

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