Seasonal Changes of Body Mass, Body Composition, and Muscular Performance in Collegiate Wrestlers

2008 ◽  
Vol 3 (2) ◽  
pp. 176-184 ◽  
Author(s):  
Thomas W. Buford ◽  
Douglas B. Smith ◽  
Matthew S. O’Brien ◽  
Aric J. Warren ◽  
Stephen J. Rossi
Keyword(s):  
Body Composition ◽  
Body Mass ◽  
Peak Torque ◽  
Mass Ratio ◽  
Leg Extension ◽  
Performance Variables ◽  
Muscular Performance ◽  
National Competition ◽  
Consecutive Time ◽  
Body Mass Ratio

Purpose:The purpose of the present investigation was to examine the physiological response of collegiate wrestlers to their competitive season.Methods:Eleven Division I collegiate wrestlers (mean ± SD; 19.45 ± 1.13 y) volunteered and completed 4 testing sessions throughout the course of the collegiate wrestling season. Testing sessions were conducted pre-, mid-, and postseason, as well as before the national tournament. Testing consisted of weigh-in, skinfold body composition testing, and a 50-rep concentric, isokinetic leg extension muscle endurance test (180°/s). Muscular performance variables measured included peak torque, peak torque at fatigue, percent decline, and peak torque/body mass ratio.Results:A significant increase (P < .05) of 2.9% was observed for body mass between midseason and postseason (2.38 kg). From pre- to postseason, a mean increase of 3.8% (3.1 kg) was observed for body mass. An increase (P < .05) in BF% of 2.9% was observed between prenationals and postseason. No significant differences (P > .05) were observed between consecutive time points for quadriceps peak torque; however, there was a significant increase (P < .05) between preseason and prenationals (23.39 N·m). Peak torque at fatigue was greater (P < .05) at midseason than preseason, representing an increase of 9.82 N·m. Between midseason and prenationals testing, we observed an 11% increase (P < .05) in %DCLN. Finally, we noted an increase (P < .05) from 0.6 to 0.69 in peak torque/body mass ratio between preseason and prenationals.Conclusions:Our results indicate that while force values seem to suffer at midseason, the wrestlers compensated and were strongest just before their national competition.

Comparison of Physical Capacities Between Nonselected and Selected Elite Male Competitive Surfers for the National Junior Team

2015 ◽  
Vol 10 (2) ◽  
pp. 178-182 ◽  
Author(s):  
Tai T. Tran ◽  
Lina Lundgren ◽  
Josh Secomb ◽  
Oliver R.L. Farley ◽  
G. Gregory Haff ◽  
...  
Keyword(s):  
Body Mass ◽  
Vertical Jump ◽  
Performance Testing ◽  
Mass Ratio ◽  
Countermovement Jump ◽  
Performance Variables ◽  
National Team ◽  
Body Mass Ratio ◽  
Physical Capacities ◽  
And Training

Purpose:To determine whether a previously validated performance-testing protocol for competitive surfers is able to differentiate between Australian elite junior surfers selected (S) to the national team and those not selected (NS).Methods:Thirty-two elite male competitive junior surfers were divided into 2 groups (S = 16, NS = 16). Their age, height, body mass, sum of 7 skinfolds, and lean-body-mass ratio (mean ± SD) were 16.17 ± 1.26 y, 173.40 ± 5.30 cm, 62.35 ± 7.40 kg, 41.74 ± 10.82 mm, 1.54 ± 0.35 for the S athletes and 16.13 ± 1.02 y, 170.56 ± 6.6 cm, 61.46 ± 10.10 kg, 49.25 ± 13.04 mm, 1.31 ± 0.30 for the NS athletes. Power (countermovement jump [CMJ]), strength (isometric midthigh pull), 15-m sprint paddling, and 400-m endurance paddling were measured.Results:There were significant (P ≤ .05) differences between the S and NS athletes for relative vertical-jump peak force (P = .01, d = 0.9); CMJ height (P = .01, d = 0.9); time to 5-, 10-, and 15-m sprint paddle; sprint paddle peak velocity (P = .03, d = 0.8; PV); time to 400 m (P = .04, d = 0.7); and endurance paddling velocity (P = .05, d = 0.7).Conclusions:All performance variables, particularly CMJ height; time to 5-, 10-, and 15-m sprint paddle; sprint paddle PV; time to 400 m; and endurance paddling velocity, can effectively discriminate between S and NS competitive surfers, and this may be important for athlete profiling and training-program design.

scholarly journals Using relative brain size to better understand trophic interactions and phenotypic plasticity of invasive lionfish (Pterois volitans)

2020 ◽  
Author(s):  
McKenna Becker
Keyword(s):  
Body Mass ◽  
Brain Size ◽  
Predation Pressure ◽  
Mass Ratio ◽  
Pterois Volitans ◽  
Predator Prey ◽  
Brain Mass ◽  
Body Mass Ratio ◽  
Relative Brain Size ◽  
The Brain

AbstractPredator-prey dynamics provide critical insight into overall coral reef health. It has been shown that predator-prey relationships link the relative brain size of predators to their prey. Predation pressure forces prey to use decision-making skills that require higher cognition by inspecting and identifying predators and then adjusting their behavior to achieve the highest chance for survival. However, the predation pressure that prey face outweighs the pressure predators face to find prey, resulting in prey having larger relative brain sizes than their predators. There is little data on the relative brain size of fishes with few natural predators such as Pterois volitans. This study compared the brain mass to body mass ratio of Pterois volitans, which have very few natural predators and thus very little predation pressure, to the brain mass to body mass ratio of their prey, possible predators, competitors, and taxonomically similar fish. Lionfish had a significantly smaller relative brain size than their predators, prey, and competitors, but was not significantly smaller than taxonomically similar fish. These results demonstrate that the morphological anti-predator adaptation of venomous spines causes little predation pressure. Thus, lionfish do not use the same cognitive skills as other prey or predators and, in turn, have smaller relative brain sizes.

scholarly journals Number of children and body composition in later life among men and women: Results from a British birth cohort study

2018 ◽  
Author(s):  
Charis Bridger Staatz ◽  
Rebecca Hardy
Keyword(s):  
Body Mass Index ◽  
Body Composition ◽  
Body Mass ◽  
Fat Mass ◽  
Lean Mass ◽  
Biological Effects ◽  
Later Life ◽  
Birth Cohort Study ◽  
Mass Ratio ◽  
Number Of Children

Background Although research has found associations between increasing number of children and higher body mass index (BMI), there has been limited research investigating the association with body composition despite abdominal fat being associated with cardiovascular and metabolic risk independently of general adiposity. Most existing research has focussed on women, but investigating the relationship in men can help distinguish biological effects of pregnancy from social pathways related to parenthood. Methods Using the MRC National Survey of Health and Development (NSHD) multiple regression models were applied to test associations between number of children and body composition at age 60-64 (N=2229) and body mass index (BMI) and waist circumference (WC) at ages 60-64 and 69 (N=2149). Results In adjusted models, associations were observed between increasing numbers of children and increasing fat-adjusted lean mass index in women (p=0.06). Among men, those with children had 0.59kg (95% CI: 0.15 to 1.02) greater lean mass index than those without and fat:lean mass ratio was greater in those with 4+ children because of their slightly higher mean fat mass. Weak evidence of a higher android:gynoid mass ratio in women with children (0.03, 95% CI: 0.00,0.06, p=0.1) was observed with no associations with fat mass index or android or gynoid fat mass. Increasing BMI was observed with increasing parity in women at 60-64 and more strongly at 69 years where associations among men were also observed more clearly. Conclusion There was little evidence of a consistent association between number of children and body composition in early old age. The strongest associations are observed for lean, rather than fat mass, and in men rather than women, suggesting little evidence of biological effects of pregnancy in women. The results indicate social pathways associated with parenthood are the likely underlying mechanisms, with suggestion there may be selection into parenthood among men.

scholarly journals A Comparison of Dietary Protein Digestibility, Based on DIAAS Scoring, in Vegetarian and Non-Vegetarian Athletes

Nutrients ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 3016 ◽  
Author(s):  
Corinne Ciuris ◽  
Heidi M. Lynch ◽  
Christopher Wharton ◽  
Carol S. Johnston
Keyword(s):  
Amino Acid ◽  
G Protein ◽  
Lean Body Mass ◽  
Body Mass ◽  
Dietary Protein ◽  
Protein Quality ◽  
Peak Torque ◽  
Diet Group ◽  
Leg Extension ◽  
Vegetarian Diets

Vegetarian diets provide an abundance of nutrients when carefully planned. However, vegetarian diets may have lower protein quality compared to omnivorous diets, a reflection of less favorable amino acid profiles and bioavailability. Hence, the current recommended dietary allowance for protein may not be adequate for some vegetarian populations. The purpose of this study was to determine dietary protein quality using the DIAAS (Digestible Indispensable Amino Acid Score) method in vegetarian and omnivore endurance athletes. DIAAS scores reflect the true ileal digestibility of the indispensable amino acids that are present in food items, and these scores can be used to compute the available protein in diet plans. Thirty-eight omnivores and 22 vegetarians submitted seven-day food records that were analyzed for nutrient content, and DIAAS scores were computed by diet group. Average available protein (g) was compared along with participants’ lean body mass and strength (quantified using the peak torque of leg extension). DIAAS scores and available protein were higher for omnivorous versus vegetarian athletes (+11% and +43%, respectively, p < 0.05). Omnivorous participants had significantly higher lean body mass than vegetarian participants (+14%), and significant correlations existed between available protein and strength (r = 0.314) and available protein and lean body mass (r = 0.541). Based upon available protein, as determined through the DIAAS, vegetarian athletes in this study would need to consume, on average, an additional 10 g protein daily to reach the recommended intake for protein (1.2 g/kg/d). An additional 22 g protein daily would be needed to achieve an intake of 1.4 g/kg/d, the upper end of the recommended intake range.

A comparison of men's and women's strength to body mass ratio and varus/valgus knee angle during jump landings

2011 ◽  
Vol 29 (13) ◽  
pp. 1435-1442 ◽  
Author(s):  
Tracie L. Haines ◽  
Jeffrey M. McBride ◽  
N. Travis Triplett ◽  
Jared W. Skinner ◽  
Kimberly R. Fairbrother ◽  
...  
Keyword(s):  
Body Mass ◽  
Valgus Knee ◽  
Mass Ratio ◽  
Knee Angle ◽  
Body Mass Ratio ◽  
Jump Landings

Seasonal Changes in Body Composition, Strength, and Muscular Power in High School Wrestlers

1994 ◽  
Vol 6 (1) ◽  
pp. 39-52 ◽  
Author(s):  
Joan M. Eckerson ◽  
Dona J. Housh ◽  
Terry J. Housh ◽  
Glen O. Johnson
Keyword(s):  
High School ◽  
Body Composition ◽  
Peak Power ◽  
Peak Torque ◽  
Isokinetic Strength ◽  
Muscular Power ◽  
Mean Power ◽  
Leg Extension ◽  
Leg Flexion ◽  
Flexion And Extension

The purpose of this investigation was to determine the changes in body composition, isokinetic strength, and muscular power in high school wrestlers across a season of competition. Wrestlers were measured (preseason and postseason) for body composition and isokinetic peak torque for flexion and extension of the dominant forearm and leg. Each subject also completed Wingate anaerobic tests to determine changes in mean power and peak power (PP) of the legs. The results indicated that body weight (BW), fat weight, and percent fat decreased (p < .002) across the wrestling season. PP and absolute peak torque for forearm and leg extension (LE) at 30°·s−1; forearm flexion (FF) at 30, 180, and 300°·s−1; and leg flexion (LF) at 180 and 300°·s−1 were significantly (p < .05) lower postseason. Relative peak torque (adjusted for BW) decreased (p < .05) across the season for LE at 30°·s−1 as well as FF and LF at 180°·s−1. Therefore, changes in BW were not associated with functional advantages in terms of strength or muscular power.

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