Exercise saves your bone mass during weightloss!

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Rodney,

An idiopathic condition known as " coronary arterial spasm " causes

heart attack even in absence of CAD:

http://www.nhlbi.nih.gov/health/dci/Diseases/HeartAttack/HeartAttack_Causes.html

Those that exercised while losing weight saved bone mass at every

site. Those losing weight w/o exercise lost vital bone mass.

Doesn't say in the study how they exercised but presumably WEIGHT

LIFTING would be a good choice because all 4 LIMBS and SPINE are

mechanically stressed. Running weight bears the spine and lower limbs

only, but the duration of the activity, or dose, can be greater with

running. A specific weightlifting exercise is performed for 1 or 2

minutes. One can sustain a " run " for 30 minutes or more.

Another consideration is the " jarring " action of running may produce

greater mechanical stresses to the lower limbs and spine than any one

weightlifting exercise. Rodney also showed evidence of bone

preservation too with prolonged volleyball. Jumping and landing

repeatedly " jars " the weightbearing bones.

The best approach may be a combination of both weightlifting to stress

all the skeletal bones, and running to specifically target the

critical weightbearing sites of the lower extremities, pelvis and

lumbar spine.

For bone preservation while CRON, well planned exercise seems a must.

bill4cr

Arch Intern Med. 2006 Dec 11-25;166(22):2502-10.

Bone mineral density response to caloric restriction-induced

weight loss or exercise-induced weight loss: a randomized controlled

trial.

* Villareal DT,

* Fontana L,

* Weiss EP,

* Racette SB,

* Steger-May K,

* Schechtman KB,

* Klein S,

* Holloszy JO.

Division of Geriatrics and Nutritional Sciences, Department of

Medicine, Washington University School of Medicine, St Louis, MO

63110, USA. dvillare@...

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.

PMID: 17159017