Search Results

You are looking at 11 - 20 of 31 items for :

Clear All
Restricted access

Farah A. Ramirez-Marrero, John Miles, Michael J. Joyner and Timothy B. Curry

Background:

This study aimed to 1) describe physical activity (PA) in 15 post gastric bypass surgery (GB), 16 obese (Ob), and 14 lean (L) participants (mean ± se: age = 37.1 ± 1.6, 30.8 ± 1.9, 32.7 ± 2.3 yrs.; BMI = 29.7 ± 1.2, 38.2 ± 0.8, 22.9 ± 0.5 kg/m2, respectively); and 2) test associations between PA, body composition, and cardiorespiratory fitness (VO2max).

Methods:

Participants completed a PA questionnaire after wearing accelerometers from 5–7 days. Body composition was determined with DEXA and CT scans, and VO2max with open circuit spirometry. ANOVA was used to detect differences between groups, and linear regressions to evaluate associations between PA (self-reported, accelerometer), body composition, and VO2max.

Results:

Self-reported moderate to vigorous PA (MVPA) in GB, Ob, and L participants was 497.7 ± 215.9, 988.6 ± 230.8, and 770.7 ± 249.3 min/week, respectively (P = .51); accelerometer MVPA was 185.9 ± 41.7, 132.3 ± 51.1, and 322.2 ± 51.1 min/week, respectively (P = .03); and steps/day were 6647 ± 141, 6603 ± 377, and 9591 ± 377, respectively (P = .03). Ob showed a marginally higher difference between self-report and accelerometer MVPA (P = .06). Accelerometer-MVPA and steps/day were inversely associated with percent fat (r = –0.53, –0.46), and abdominal fat (r = –0.36, –0.40), and directly associated with VO2max (r = .36).

Conclusions:

PA was similar between GB and Ob participants, and both were less active than L. Higher MVPA was associated with higher VO2max and lower body fat.

Restricted access

Ina Garthe, Truls Raastad, Per Egil Refsnes, Anu Koivisto and Jorunn Sundgot-Borgen

When weight loss (WL) is necessary, athletes are advised to accomplish it gradually, at a rate of 0.5–1 kg/wk. However, it is possible that losing 0.5 kg/wk is better than 1 kg/wk in terms of preserving lean body mass (LBM) and performance. The aim of this study was to compare changes in body composition, strength, and power during a weekly body-weight (BW) loss of 0.7% slow reduction (SR) vs. 1.4% fast reduction (FR). We hypothesized that the faster WL regimen would result in more detrimental effects on both LBM and strength-related performance. Twenty-four athletes were randomized to SR (n = 13, 24 ± 3 yr, 71.9 ± 12.7 kg) or FR (n = 11, 22 ± 5 yr, 74.8 ± 11.7 kg). They followed energy-restricted diets promoting the predetermined weekly WL. All athletes included 4 resistance-training sessions/wk in their usual training regimen. The mean times spent in intervention for SR and FR were 8.5 ± 2.2 and 5.3 ± 0.9 wk, respectively (p < .001). BW, body composition (DEXA), 1-repetition-maximum (1RM) tests, 40-m sprint, and countermovement jump were measured before and after intervention. Energy intake was reduced by 19% ± 2% and 30% ± 4% in SR and FR, respectively (p = .003). BW and fat mass decreased in both SR and FR by 5.6% ± 0.8% and 5.5% ± 0.7% (0.7% ± 0.8% vs. 1.0% ± 0.4%/wk) and 31% ± 3% and 21 ± 4%, respectively. LBM increased in SR by 2.1% ± 0.4% (p < .001), whereas it was unchanged in FR (–0.2% ± 0.7%), with significant differences between groups (p < .01). In conclusion, data from this study suggest that athletes who want to gain LBM and increase 1RM strength during a WL period combined with strength training should aim for a weekly BW loss of 0.7%.

Restricted access

Rebecca M. Dagger, Ian G. Davies, Kelly A. Mackintosh, Genevieve L. Stone, Keith P. George, Stuart J. Fairclough and Lynne M. Boddy

-ray absorptiometry (DEXA) scans to provide detailed information on body composition. This study reports outcomes from the subsample group who participated in these additional measures rather than the full CHANGE! pragmatic evaluation group. The aim of this analysis was to assess changes in measures of body size and

Full access

Petter Fagerberg

amount of exercise (predefined and controlled amount of exercise and self-reports); objective measurements of body composition and FFM (e.g., dual-energy X-ray absorptiometry [DEXA] hydrostatic weighing, magnetic resonance imaging, skinfolds, or four-compartment model); and outcomes showing effects on

Restricted access

Bailey Peck, Timothy Renzi, Hannah Peach, Jane Gaultney and Joseph S. Marino

. *Significant effect of sport ( P  < .05). Dual-Energy X-ray Absorptiometry A whole-body and regional dual-energy X-ray absorptiometry (DEXA; GE Lunar Primo Prodigy, Madison, WI; enCORE™ 2011 software, version 15) scan was performed to measure percent body fat. 14 Color mapping indicated areas of high and low

Open access

Vassiliadis, H Braun, HG Predel, M Thevis 14.30 Longitudinal changes in body fat assessed by DEXA are adequately reflected by skinfold measurements according to ISAK standards SL Danen, IJM Ceelen, KL Jonvik, KJM Paulussen, FC Wardenaar, LJC van Loon, JW van Dijk 14.45 Carbohydrate for Endurance Athletes in

Restricted access

Daniel E. Lidstone, Justin A. Stewart, Reed Gurchiek, Alan R. Needle, Herman van Werkhoven and Jeffrey M. McBride

day. Dual-energy x-ray absorptiometry (DEXA) measurements and V ˙ O 2   max testing were performed on testing day 1 with the load carriage task performed on testing day 2 at least 48 hours after testing day 1. DEXA Measurements Before DEXA measures, height and mass were determined using a calibrated

Full access

Sherry Robertson and Margo Mountjoy

intense training • Include blood and urine tests to assess iron, vitamin D status, and hydration state • Include BMD (measured by DEXA) in athletes with LEA, DE/ED, or amenorrhea • Include RED-S screening as part of the annual PHE • Utilize the RED-S CAT intended for sports medicine professionals to

Restricted access

Meltem Dizdar, Jale Fatma Irdesel, Oguzhan Sıtkı Dizdar and Mine Topsaç

 = weight/square of height kg/m 2 ), and duration of OP diagnosis were collected. Patients were also questioned in terms of OP risk factors, dual-energy X-ray absorptiometry (DEXA), fracture risk (Fracture Risk Assessment Tool [FRAX]), history and frequency of falls, use of drugs known to increase fall risk

Restricted access

Megan Colletto and Nancy Rodriguez

to the nearest cm using a stadiometer, and body weight was measured in the morning, before breakfast, using a portable digital scale to the nearest 0.1 lb (Health-O-Meter Inc., Model 349KLX, Bridgeview, IL). Body composition was measured using dual energy x-ray absorptiometry (DEXA) (DPX