Re: Re: Weight Loss Through Calorie Restriction,But Not Exercise, May Lead To Bone L

[Guest guest]

Hi All,

For your information regarding the exercise (EX) used

for the CRers, EXers, and healthy lifestylers (HLers):

EX QUALITY AND QUANTITY

Seven-day Physical Activity Recall Questionnaire

findings indicated that MET hours per day increased in

the EX group (from 10.4±2.5 to 14.1±4.4) but remained

unchanged in the CR (from 11.0±2.9 to 10.1±1.3) and HL

(from 9.8±1.9 to 10.9±3.4) groups (P value between

groups, .01). Heart rate monitors revealed that the EX

group exercised 5.8±2.5 sessions per week for

62.5±17.8 minutes per session, at an intensity of

72%±9% of maximal heart rate and expended 317±160

kcal/d. The most frequently used modes of EX were

walking and/or jogging, elliptical machines, and cycle

ergometers. Walking and/or jogging was reported 2.7

times more frequently than elliptical training and 5

times more frequently than cycling.

--- bill4cr <bill4cr@...> wrote:

> " CR-induced weight loss, but not EX-induced weight

> loss, is associated

> with reductions in BMD at clinically important sites

> of fracture.

> Despite weight loss, the EX group did not

> demonstrate a decrease in

> BMD at any site. "

>

>

> They don't say what kind of exercise (likely

> resistance training) but

> here is the actual study abstract:

>

> Bone Mineral Density Response to Caloric

> Restriction–Induced Weight

> Loss or Exercise-Induced Weight Loss

>

> A Randomized Controlled Trial

>

> Dennis T. Villareal, MD; Luigi Fontana, MD, PhD;

> P. Weiss, PhD;

> B. Racette, PhD; Steger-May, MA;

> B. Schechtman,

> PhD; Klein, MD; O. Holloszy, MD

>

> Arch Intern Med. 2006;166:2502-2510.

>

> Background Bone loss often accompanies weight loss

> induced by caloric

> restriction (CR), but whether bone loss accompanies

> similar weight

> loss induced by exercise (EX) is unknown. We tested

> the hypothesis

> that EX-induced weight loss is associated with less

> bone loss compared

> with CR-induced weight loss.

>

> Methods Forty-eight adults (30 women; 18 men; mean

> ± SD age, 57 ± 3

> years; and mean ± SD body mass index, 27 ± 2 kg/m2)

> were randomized to

> 1 of 3 groups for 1 year: CR group (n = 19), regular

> EX group (n =

> 19), or a healthy lifestyle (HL) control group (n =

> 10). Primary

> outcome measure was change in hip and spine bone

> mineral density

> (BMD). Secondary outcomes were bone markers and

> hormones.

>

> Results Body weight decreased similarly in the CR

> and EX groups

> (10.7% ± 6.3% [–8.2 ± 4.8 kg] vs 8.4% ± 6.3% [–6.7 ±

> 5.6 kg]; P =

> .21), whereas weight did not change in the HL group

> (–1.2% ± 2.5%

> [–0.9 ± 2.0 kg]). Compared with the HL group, the CR

> group had

> decreases in BMD at the total hip (–2.2% ± 3.1% vs

> 1.2% ± 2.1%; P =

> .02) and intertrochanter (–2.1% ± 3.4% vs 1.7 ±

> 2.8%; P = .03). The CR

> group had a decrease in spine BMD (–2.2% ± 3.3%; P =

> .009). Despite

> weight loss, the EX group did not demonstrate a

> decrease in BMD at any

> site. Body weight changes correlated with BMD

> changes in the CR (R =

> 0.61; P = .007) but not in the EX group. Bone

> turnover increased in

> both CR and EX groups.

>

> Conclusions CR-induced weight loss, but not

> EX-induced weight loss,

> is associated with reductions in BMD at clinically

> important sites of

> fracture. These data suggest that EX should be an

> important component

> of a weight loss program to offset adverse effects

> of CR on bone.

>

>

> >

> > F.Y.I.

> >

> >

>

http://www.sciencedaily.com/releases/2006/12/061212091854.htm

-- Al Pater, PhD; email: Alpater@...

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