Usually when I do lunges use a barbell at home instead of using dumbbells. However, sometimes when I go to the gym with someone from my family or a friend of mine and the gym that I go to is small and does have any barbells and weight plates available.
So whenever I do lunges at the gym I use dumbbells that they have there instead. So my question is what happens to my strength/mass gains when I occasionally switch from barbells to dumbbells in a given exercise such as lunges? I mean how much does it affect the progressive overloading process?