methods results introduction discussion conclusion

2 downloads 0 Views 152KB Size Report
California State University, Fullerton, Fullerton, CA. Figure 1. Figure 2. Figure 3. 1050. 850. 650. 450. 250. 50. Velocity. Watts. 30 60 90 120 150 180 210 240 ...
The Effect of Gender on Absolute and Relative Peak Power Kelly, S.B., L.E. Brown FACSM, S.M. Zinder, L.M. Gardner, N.R. Wood, S.G. Bera, D. Nguyen, N.M. Garrett and D.P. Murray California State University, Fullerton, Fullerton, CA INTRODUCTION

Sixty male (n=25) and female (n=35) university kinesiology students (age 23.132.11 yrs, height 170.9410.68 cm, weight 71.1915.34 kg) performed 3 maximal concentric knee extension repetitions on an isokinetic dynamometer at 15 random speeds between 30 and 500 d/s. Muscle CSA was estimated via the Housh equation derived from the anterior thigh skinfold and circumference. Differences between males and females were determined at each speed using ANOVA.

1050 850 650 450 250 50

15 Male Female

10

30 60

90 120 150 180 210 240 270 300 330 360 400 450 500

Peak Power / Body Weight by Gender

90 120 150 180 210 240 270 300 330 360 400 450 500

Velocity

10

DISCUSSION These results demonstrate that the greater body mass or thigh muscle mass of males does not completely explain strength differences between genders.

15

Watts / kg

30 60

Figure 3.

Figure 1.

Male Female

5 0

30 60

90 120 150 180 210 240 270 300 330 360 400 450 500

Velocity Figure 2.

Male Female

5 0

Velocity

RESULTS Males were significantly heavier (males=81.5111.64 kg; females=63.8313.34 kg) and had greater thigh CSA (males=143.12 18.17; females 114.5521.56) than females. Males also demonstrated significantly (p< 0.05) greater power across all speeds when compared to females in terms of absolute peak power (males=119.2027.18; females=81.0621.09 at 30 d/s, males=792.54192.68; females=531.41107.07 at 500 d/s), peak power relative to body weight (males=1.470.27 W/kg; females=1.270.26 W/kg at 30 d/s, males=9.662.17 W/kg; females=8.041.32 W/kg at 500 d/s), and peak power relative to CSA (males=1.610.26 W/CSA; females=1.430.28 W/CSA at 30 d/s, males=10.521.89 W/CSA; females=8.751.21 W/CSA at 500 d/s).

Peak Power / CSA by Gender Watts / cm2

METHODS

Absolute Peak Power by Gender

Watts

There is speculation that men and women have similar lower body power when controlling for body weight and cross-sectional area (CSA). The purpose of this study was to evaluate the effects of gender and body mass on absolute and relative peak power.

CONCLUSION Although body size plays a large role in strength expression, other factors must be influencing the male bias such as neuromuscular efficiency or female inhibition.