[CidadeNovaRP]

Try this:

pawn Код:

if (HOLDING( KEY_SPRINT ))
{
    if(GetPlayerState(playerid) == PLAYER_STATE_ONFOOT)
    {
        ApplyAnimation(playerid,"MUSCULAR","MuscleSprint",4.0,1,1,1,1,1);
    }
    else
    {
        return 1;
    }
    return 1;
}
else if (RELEASED( KEY_SPRINT ))
{
    if(GetPlayerState(playerid) == PLAYER_STATE_ONFOOT)
    { 
        ClearAnimations(playerid);
    }
    else
    {
        return 1;
    }
    return 1;
}

and

pawn Код:

// HOLDING(keys)
#define HOLDING(%0) \
    ((newkeys & (%0)) == (%0))

// RELEASED(keys)
#define RELEASED(%0) \
    (((newkeys & (%0)) != (%0)) && ((oldkeys & (%0)) == (%0)))