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Ground reaction force comparison between barefoot and shod single leg landing at varied heights
Title
Ground reaction force comparison between barefoot and shod single leg landing at varied heights.
Author
Arnett, Jocelyn Esther
Abstract/Description
Landing is a common movement that occurs in many sports. Barefoot research has gained popularity in examining how shoes can alter natural movements. However, it is unknown how a single leg landing under barefoot conditions, as well as landing height, will affect ground reaction forces (GRF). PURPOSE: The purpose of this research was to examine the differences in ground reaction forces during a single leg landing under barefoot and shod conditions from various heights. METHODS: Sixteen female...
Show moreLanding is a common movement that occurs in many sports. Barefoot research has gained popularity in examining how shoes can alter natural movements. However, it is unknown how a single leg landing under barefoot conditions, as well as landing height, will affect ground reaction forces (GRF). PURPOSE: The purpose of this research was to examine the differences in ground reaction forces during a single leg landing under barefoot and shod conditions from various heights. METHODS: Sixteen female Division II collegiate athletes, 8 basketball (age: 19.88 ± 0.64 yrs; height: 1.77 ± 0.09 m; mass: 75.76 ± 12.97 kg) and 8 volleyball (age: 20.00 ± 1.07 yrs; height: 1.74 ± 0.08 m; mass: 72.41 ± 5.41 kg), performed single leg landings from 12 inches, 18 inches, 24 inches, and 30 inches barefoot and shod. An AMTI AccuGait force plate was used to record GRF. A 2 (condition) x 4 (box height) x 2 (sport) repeated measures ANOVA was performed to determine any GRF differences. RESULTS: There were no significant three way or two-way interactions for GRF (p > 0.05). There was also no main effect for sport (p > 0.05). There were main effects for footwear and box height (p = 0.000) where shod (2295.121 ± 66.025 N) had greater impact than barefoot (2090.233 ± 62.684 N). CONCLUSIONS: Single leg shod landing produced greater vertical ground reaction forces (vGRF) than during a barefoot landing. Current research continues to be contradictory on whether or not barefoot activities lower GRF; therefore, it is important to continue research in this area.
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Date Issued
2020, 2020
Identifier
1201541141, WFE0000709
Format
Document (PDF)
Neuromuscular control and movement variability in adolescent female soccer athletes during simulated soccer jump header landing task
Title
Neuromuscular control and movement variability in adolescent female soccer athletes during simulated soccer jump header landing task.
Author
Grammer, Emily Elizabeth
Abstract/Description
The lateral ankle sprain (LAS) is the most common orthopedic injury in athletics and is the result of simultaneous excessive inversion of the ankle and supination of the foot. Following initial LAS, degenerative changes have been found in over 70% of participants for extended periods of time. With the aforementioned degenerative changes typically come alterations in movement patterns, muscle activation patterns, and arthrokinematics. The current study aimed to investigate the effects of LAS...
Show moreThe lateral ankle sprain (LAS) is the most common orthopedic injury in athletics and is the result of simultaneous excessive inversion of the ankle and supination of the foot. Following initial LAS, degenerative changes have been found in over 70% of participants for extended periods of time. With the aforementioned degenerative changes typically come alterations in movement patterns, muscle activation patterns, and arthrokinematics. The current study aimed to investigate the effects of LAS history on neuromuscular control during a soccer specific jump-landing task and to illustrate the impact of limb (injured vs. non-injured) on neuromuscular control during a soccer specific jump-landing task in female adolescent athletes (n = 14, age = 16 ± 1.0 yr). A control group (n = 7) and a group designated as the "ankle sprain" group (n = 7) were used. The injured ankles in the ankle sprain group and the dominant limbs of the control group were labeled "affected," while the uninjured limbs of the ankle sprain group and the non-dominant limbs of the control group were labeled "unaffected." Electromyography (EMG) sensors were placed on 6 lower-limb muscles of each participant bilaterally, totaling 12 sensors per participant -- Lateral Gastrocnemius (LG), Peroneus Longus (PL), Tibialis Anterior (TA), Vastus Lateralis (VL), Vastus Medialis (VM), and Biceps Femoris (BF). Each participant completed a 5-minute low-to-moderate intensity warm-up on a cycler ergometer, then completed 10 soccer-header jump-landing trials. There were no significant limb by group interactions (p > 0.05) or group main effects (p > 0.05) found in the current study. Pre-landing data showed significant limb main effects for the vi standard deviation (SD) of the unaffected PL (p = 0.017) and the affected VL (p = 0.048). Furthermore, significant limb main effects were discovered for the COV of pre-landing muscle activation for the PL (p = 0.043), LG (p = 0.049), and VL (p = 0.048). During the post-landing period, significant limb main effects were recorded for the average activation (p = 0.001) and SD (p = 0.003) of the PL and the COV of the VL (p = 0.038). Reduced activation of the nondominant limbs illustrated increased neuromuscular control in the distal musculature (PL), while the proximal musculature (VL) demonstrated reduced neuromuscular control on the unaffected limbs. The current study discovered that limb dominance was a more prominent factor in altered lower-leg neuromuscular control compared to ankle injury history. Limb differences were mostlikely the result of the sport-specific demands placed on the dominant and non-dominant limbs during soccer, which elicited increased muscular responses of the non-dominant limb during jump-landing tasks.
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Date Issued
2019, 2019
Identifier
1152894502, WFE0000692
Format
Document (PDF)