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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 Rectus 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=0.076).
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f1-jhk-41-15: Means and standard deviations for Rectus 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=0.076).

Mentions: Warm-up (Slow) shot speed was 15.2±4.3 m/s while game shot (Fast) speed was 19.1±4.2 m/s. The RF was influenced by the interaction of Phase and Speed (Figure 1, p<0.05). Using post hoc testing, it was determined that the RF was greater during Fast vs. Slow during Crank Back Minor and Major phases as well as Stick Deceleration phase (p<0.05), but not different between shots for Stick Acceleration (p=0.076).


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

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

Means and standard deviations for Rectus 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=0.076).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1-jhk-41-15: Means and standard deviations for Rectus 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=0.076).
Mentions: Warm-up (Slow) shot speed was 15.2±4.3 m/s while game shot (Fast) speed was 19.1±4.2 m/s. The RF was influenced by the interaction of Phase and Speed (Figure 1, p<0.05). Using post hoc testing, it was determined that the RF was greater during Fast vs. Slow during Crank Back Minor and Major phases as well as Stick Deceleration phase (p<0.05), but not different between shots for Stick Acceleration (p=0.076).

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