A Comparison Between Male and Female Strength to Body Mass Ratios and Varus/Valgus Knee Angles During Jump Landings
- ASU Author/Contributor (non-ASU co-authors, if there are any, appear on document)
- Tracie Lynn Haines (Creator)
- Institution
- Appalachian State University (ASU )
- Web Site: https://library.appstate.edu/
- Advisor
- Jeffrey M. McBride
Abstract: The reason for the presence of valgus knee angles during jumping in certain
individuals is unclear. It appears to be more prevalent in females but has been observed in
male subjects as well. Valgus knee position has been attributed to an increase in knee
injury. The purpose of this investigation was to compare valgus/varus knee angles during
various jumps and lower body strength levels between males and females relative to body
mass. Seventeen recreationally active females (age: 21.94±2.59 years; height:
167.32±5.20 cm; mass: 64.42±8.39 kg; % body fat: 26.89±6.26; squat 1RM: 66.18±19.47
kg; S:BM: 1.03±0.28) and thirteen recreationally active males (age: 21.69±1.65 years;
height: 176.85±7.26 cm; mass: 72.39±9.23 kg; % body fat: 13.15±5.18; squat 1RM:
115.77±30.40 kg; S:BM: 1.59±0.31) performed a one repetition maximum in the squat
(1RM) and three of each of the following jumps: counter-movement jump (CMJ), 30 cm drop jump (DJ30), 45 cm drop jump (DJ45) and 60 cm drop jump (DJ60). Knee angles
were analyzed through videography, concentric forces were collected from a force plate,
and body composition was analyzed by dual energy X-ray absorptiometry to allow for
squat to body mass ratio (S:BM) and squat to fat-free mass (S:FFM) to be calculated.
Significant differences (p = 0.05) were found between male and female 1RM, male and
female S:BM, and male and female S:FFM. Significant differences were found between
male and female varus/valgus knee positions during maximum flexion (MF) of the right
leg in the CMJ, DJ30, DJ45 and DJ60. Significant differences were found between male
and female varus/valgus knee positions during maximum flexion of the left leg in the
CMJ, DJ30, DJ45 and DJ60. Peak concentric force data was only found to be significant
between males and females at CMJ, but not at DJ30, DJ45, or DJ60. Correlations
between varus/valgus knee angles and S:BM for all for jumps displayed moderate, nonsignificant
relationships (CMJ, r = 0.445; DJ30 r = 0.448; DJ45 r = 0.449; DJ60 r =
0.439). In conclusion, males and females have significantly different lower body strength
levels and varus/valgus knee position when landing from jumps. The discrepancy in
strength level could be an important factor in knee position when landing.
A Comparison Between Male and Female Strength to Body Mass Ratios and Varus/Valgus Knee Angles During Jump Landings
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Created on 8/31/2010
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Additional Information
- Publication
- Thesis
- Haines, T.L. (2010). A Comparison Between Male and Female Strength to Body Mass Ratios and Varus/Valgus Knee Angles During Jump Landings. Unpublished master’s thesis. Appalachian State University, Boone, NC.
- Language: English
- Date: 2010