The Hammers could secure their Barclays Premier League status with a win over Newcastle on Saturday, with McDonald's hometown club still embroiled in a relegation dog-fight.
Former Newcastle boss Allardyce is well-known for his use of technology and sports science but it is the offer of a few days away from training that has worked a treat with his players.
"He has done that once already this season and we've had a fantastic response from a physical point," McDonald said.
"They've been working hard for nine months so to have a break, as long as they're not abusing their bodies and they come back fresh, is a good thing.
"It gets a fantastic response from the players and when they get that, it's good for them to go home and share some time with the family."