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Impact Of A Lightweight Nylon Fiber Undergarment On The Energy Cost Of Walking In Middle-aged Women: 1889Board #18 June 3 9:00 AM - 10:30 AM

Mothersbaugh, Joni; Rynders, Corey; Katch, Frank FACSM; Weltman, Arthur FACSM

Medicine & Science in Sports & Exercise: May 2010 - Volume 42 - Issue 5 - p 434-435
doi: 10.1249/01.MSS.0000384972.49613.b6
C-21 Free Communication/Poster - Energy Balance and Weight Control: JUNE 3, 2010 7:30 AM - 12:30 PM: ROOM: Hall C

University of Virginia, Charlottesville, VA.

(No disclosure reported)

PURPOSE: The energy deficit required to prevent weight gain in most adults averages approximately 100 kcal daily. As a novel approach to closing this energy gap, we examined the effects of a nylon fiber undergarment designed to gently resist hip flexion during movement on the energy cost of walking.

METHODS: Fifteen middle-age women (age= 39.4+/-6.6 yr; stature= 167.9+/-6.4 cm; body mass= 74.6+/-7.6kg; BMI= 26.4+/-1.6 kg/m2) participated in 2x15-min treadmill walking tests separated by 15-min of rest. Treadmill velocity remained constant for each test (3.0 mph) with grade increased 5% every 5-min (0%, 5%, 10%). In a randomized order, subjects completed one test wearing the undergarment (G) and a control test with their usual undergarment (C). Indirect calorimetry assessed energy expenditure (EE; kCal/min-1) for each treadmill grade as the mean of the last 2-min of each 5-min segment.

RESULTS: No significant differences occurred in EE between G and C at 0% grade (G= 4.69 +/- 0.7 vs C= 4.70 +/- 0.8 kCal/min-1; p=0.96). Walking EE tended to be higher with the G at 5% grade (G= 6.73 +/- 0.8 vs C= 6.58 +/- 0.9 kCal/min-1; p=0.11); in contrast, EE was significantly elevated with the G at 10% grade (G= 9.41 +/- 1.1 vs C= 9.13 +/- 1.2 kCal/min-1; p=0.04). Eleven subjects (73%) who responded to the garment increased walking energy expenditure by 3 to 16%.

CONCLUSIONS: The nylon undergarment effectively augmented the energy cost of walking particularly at higher treadmill grades. This may have direct utility to increase the caloric cost of other common physical activities of daily living such as walking uphill, hiking, or stair climbing.

Supported in part by a grant from Mayfair Tech Inc.

© 2010 American College of Sports Medicine