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Lower Extremity Muscle Activity During a Women's Overhand Lacrosse Shot.

Millard BM, Mercer JA - J Hum Kinet (2014)

Bottom Line: BF was greater during Fast vs.RF and GA were each influenced by the interaction of Phase and Speed (p<0.05) with GA being greater during Fast vs.The greater muscle activity (BF, RF, GA) during Fast vs.

View Article: PubMed Central - PubMed

Affiliation: Department of Kinesiology and Nutrition Sciences, University of Nevada, Las Vegas.

ABSTRACT
The purpose of this study was to describe lower extremity muscle activity during the lacrosse shot. Participants (n=5 females, age 22±2 years, body height 162.6±15.2 cm, body mass 63.7±23.6 kg) were free from injury and had at least one year of lacrosse experience. The lead leg was instrumented with electromyography (EMG) leads to measure muscle activity of the rectus femoris (RF), biceps femoris (BF), tibialis anterior (TA), and medial gastrocnemius (GA). Participants completed five trials of a warm-up speed shot (Slow) and a game speed shot (Fast). Video analysis was used to identify the discrete events defining specific movement phases. Full-wave rectified data were averaged per muscle per phase (Crank Back Minor, Crank Back Major, Stick Acceleration, Stick Deceleration). Average EMG per muscle was analyzed using a 4 (Phase) × 2 (Speed) ANOVA. BF was greater during Fast vs. Slow for all phases (p<0.05), while TA was not influenced by either Phase or Speed (p>0.05). RF and GA were each influenced by the interaction of Phase and Speed (p<0.05) with GA being greater during Fast vs. Slow shots during all phases and RF greater during Crank Back Minor and Major as well as Stick Deceleration (p<0.05) but only tended to be greater during Stick Acceleration (p=0.076) for Fast vs. Slow. The greater muscle activity (BF, RF, GA) during Fast vs. Slow shots may have been related to a faster approach speed and/or need to create a stiff lower extremity to allow for faster upper extremity movements.

No MeSH data available.


Related in: MedlinePlus

Means and standard deviations for Biceps Femoris muscle activity (percent Maximal Voluntary Isometric Contraction (%MVIC)) for each phase of the lacrosse shot during slow and fast shot speeds. Note: * indicates difference between shots for that phase (p<0.05) and + indicates trend for difference (p=0.053).
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f2-jhk-41-15: Means and standard deviations for Biceps Femoris muscle activity (percent Maximal Voluntary Isometric Contraction (%MVIC)) for each phase of the lacrosse shot during slow and fast shot speeds. Note: * indicates difference between shots for that phase (p<0.05) and + indicates trend for difference (p=0.053).

Mentions: The BF was not influenced by the interaction of Phase and Speed (Figure 2, p>0.05) and was significantly different between the Phases regardless of Speed (p<0.05) but there was no main effect for Speed (p>0.05). However, since there was a trend for an interaction effect (p=0.062), post hoc tests were ran and it was determined that BF was greater during the Fast vs. Slow shot for Crank Back Major, Stick Acceleration, and Stick Deceleration phases (p<0.05). Interestingly, BF also tended to be greater during Crank Back Minor (p=0.053).


Lower Extremity Muscle Activity During a Women's Overhand Lacrosse Shot.

Millard BM, Mercer JA - J Hum Kinet (2014)

Means and standard deviations for Biceps Femoris muscle activity (percent Maximal Voluntary Isometric Contraction (%MVIC)) for each phase of the lacrosse shot during slow and fast shot speeds. Note: * indicates difference between shots for that phase (p<0.05) and + indicates trend for difference (p=0.053).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4120448&req=5

f2-jhk-41-15: Means and standard deviations for Biceps Femoris muscle activity (percent Maximal Voluntary Isometric Contraction (%MVIC)) for each phase of the lacrosse shot during slow and fast shot speeds. Note: * indicates difference between shots for that phase (p<0.05) and + indicates trend for difference (p=0.053).
Mentions: The BF was not influenced by the interaction of Phase and Speed (Figure 2, p>0.05) and was significantly different between the Phases regardless of Speed (p<0.05) but there was no main effect for Speed (p>0.05). However, since there was a trend for an interaction effect (p=0.062), post hoc tests were ran and it was determined that BF was greater during the Fast vs. Slow shot for Crank Back Major, Stick Acceleration, and Stick Deceleration phases (p<0.05). Interestingly, BF also tended to be greater during Crank Back Minor (p=0.053).

Bottom Line: BF was greater during Fast vs.RF and GA were each influenced by the interaction of Phase and Speed (p<0.05) with GA being greater during Fast vs.The greater muscle activity (BF, RF, GA) during Fast vs.

View Article: PubMed Central - PubMed

Affiliation: Department of Kinesiology and Nutrition Sciences, University of Nevada, Las Vegas.

ABSTRACT
The purpose of this study was to describe lower extremity muscle activity during the lacrosse shot. Participants (n=5 females, age 22±2 years, body height 162.6±15.2 cm, body mass 63.7±23.6 kg) were free from injury and had at least one year of lacrosse experience. The lead leg was instrumented with electromyography (EMG) leads to measure muscle activity of the rectus femoris (RF), biceps femoris (BF), tibialis anterior (TA), and medial gastrocnemius (GA). Participants completed five trials of a warm-up speed shot (Slow) and a game speed shot (Fast). Video analysis was used to identify the discrete events defining specific movement phases. Full-wave rectified data were averaged per muscle per phase (Crank Back Minor, Crank Back Major, Stick Acceleration, Stick Deceleration). Average EMG per muscle was analyzed using a 4 (Phase) × 2 (Speed) ANOVA. BF was greater during Fast vs. Slow for all phases (p<0.05), while TA was not influenced by either Phase or Speed (p>0.05). RF and GA were each influenced by the interaction of Phase and Speed (p<0.05) with GA being greater during Fast vs. Slow shots during all phases and RF greater during Crank Back Minor and Major as well as Stick Deceleration (p<0.05) but only tended to be greater during Stick Acceleration (p=0.076) for Fast vs. Slow. The greater muscle activity (BF, RF, GA) during Fast vs. Slow shots may have been related to a faster approach speed and/or need to create a stiff lower extremity to allow for faster upper extremity movements.

No MeSH data available.


Related in: MedlinePlus