Changes Resulting From 3 Weeks of Not Training

Aerobic Capacity -8%
Heart Stroke Volume -10%
Submaximum Heart Rate +4 bpm
Blood Plasma Volum -12%
Muscle Capillary Density -7%
Oxidative Enzymes -29%
Blood lactate during exercise +88%
Lactate Threshold -7%
Use of fat for fuel during exercise -52%
Time to fatique in minutes -10%

(Adapted form Wilber, R.L. and R.J. Moffatt. 1994. Journal of Strength Conditioning Research 8:110.)