"My teammates usually say I'm a gold-medal speaker who is the loudest in the team," she said.
It's necessary, she added, to yell on court to make sure that each player positions themselves in the right place and makes the right move during a match. This gives the team the best chance of success. When something needs to be said, a good team captain should be able to communicate honestly to teammates, said Wilavan, who has served as the captain for seven years.
"I'm a hitter, so the louder I call the ball, the more our setter knows that I want to hit and the more sets I'm going to get," she explained.
The 29-year-old developed a love for team sports when she was young.
"I love the feeling of being part of the team and having everyone around me," she said. "At a personal level, each player in a team has to work hard in order to secure a position on the team. While we have to work together with teammates in order to achieve a bigger goal, it's very challenging."
Wilavan first got involved in volleyball while at high school in Nakhon Ratchasima province. She started to get serious about the sport and played it competitively at Bangkok University where she graduated with bachelor's and master's degrees in business administration.
It was the feeling of uncertainty in a volleyball game that got her hooked.
"Anything is possible. Anything can happen. That's why I play the game," she enthused.
After her 16 years representing Thailand as a national player, Wilavan has proven herself to be one of the most competent players, and as captain, knows a strong sense of leadership is required.
"Managing people isn't easy. I have to learn to deal with different people on the team," she said
She has come to know each individual's personality and understand what motivates them and what enables them to quell the panic inside when things don't go their way.
"Our teammates are different. I have to make sure I know their needs and be responsive to them. Of course, there are teammates whom I can talk openly with when they do things that may bother the team. Some are friendly players but the toughness is there so I try to confide in them and talk to them calmly about an issue. Many want to hear some words of encouragement from me in order to inspire them to perform a job well done," she said.
Being a leader gives Wilavan the opportunity to practise responsibility and to make personal sacrifices for the team and that will help her later in life.
"The team comes first. What the team needs, that's what a good captain has to do," she said. So what does she usually do when her leadership is sometimes tested or not accepted by the rest of the team?
"I'm quite lucky that our players constantly follow my leadership. Many of them are my friends who have been playing in the team for years," she answered, also revealing that the secrets to her managing style are establishing trust among her teammates and setting a good example to junior players.
"As a team leader, we have to make followers believe in us and that, I believe, contributes to fellowship. When the foundation for trust is loosened, the followers may not accept your leadership.
"A captain doesn't need to be the best player on the team or the strongest person in training, but she needs to be a good example for teammates on court."
To Wilavan, setting a good example on the court means being a good player who is engaged in regular training, who has a good attitude towards teammates and always supports the team.
When pressure is on and teammates have lost confidence, Wilavan has attempted to use verbal communication and body language to express her encouragement in order to ease the stressed vibe, rather than monitoring the mistakes and errors of each player and then initiating corrective action to improve the team's performance.
"I've tried to keep the chemistry growing among our teammates. Nobody wants to make a mistake. I keep telling them to focus on the present moment, but try not to dwell on the past or worry about a bad outcome in the future," she said.
"I've tried to be positive and give gentle encouragement to make them loose in order to take it further. This helps the whole team work better together, I think," she said. If a player makes mistakes, Wilavan explained that some of them manage to continue playing the game, while some may need a break before they are ready to carry on.
"Being a captain, I must be mentally tough," she said.
"The hardest thing is when I'm not in good form on some days but still I have to give emotional support to other players."
Her unforgettable experiences with volleyball include when she played her first game for the Thai women's national volleyball team in 1997 and when she became a professional player in Spain in 2008, which changed her attitude towards the sport.
"My family were proud of me when I first represented Thailand. As a professional player, I can make money for my family [as well as] doing them proud," said Wilavan, who is now playing professionally in the Central Asian country of Azerbaijan.
One of the best volleyball matches for her and for the team, she recalled, was the recent 2013 Asian Women's Volleyball Championships final held in Nakhon Ratchasima last month, when Thailand delivered an upset to comfortably beat Japan in three sets.
The team is currently ranked 12th in the world and has been conferred a royal insignia (Commander, Third Class, of the Most Exalted Order of the White Elephant) in recognition of the good reputation they earned for the country.
"Every player in the team was in top form that night," she recalled. "We were up against the best teams in the world and it showed people our potential to play as a strong team. It's such a huge celebration of what we had achieved as a volleyball team and as a nation.
"As a national athlete, nothing is more important than playing with the support of our entire nation. Thanks to the crowd who was there to support us - the roar was so immense when we scored a point."
Most important of all, after the match, Wilavan was chosen as the tournament's most valuable player.
"The award did surprise me. I think everyone in the team deserved the award as the dedication from each one of us contributed to the success of the game," she said.
As the team captain, Wilavan is certain that the achievement will lift the team's hopes for success in passing muster for the next Summer Olympic Games to be held in Brazil in 2016.
"Being an Olympian has always been my dream," Wilavan said. "We will try harder and harder to make our dream come true."