Sixty-four healthy male participants ( mean SD age , @ @ years ; height , @ @ cm ; mass , @ @ kg ; subcutaneous fat thickness , @ @ cm ) were randomly assigned into @ of @ groups : ( @ ) @-mA current , @-mm probe depth ; ( @ ) @-mA current , @-mm probe depth ; ( @ ) @-mA current , @-mm probe depth ; ( @ ) @-mA current , @-mm probe depth ; ( @ ) in vivo retrodialysis ; and ( @ ) skin perfusion flowmetry .