APA (7th ed.) Citation

Nuuttila, O., Kyröläinen, H., Kokkonen, V., & Uusitalo, A. Morning versus Nocturnal Heart Rate and Heart Rate Variability Responses to Intensified Training in Recreational Runners. SpringerOpen.

Chicago Style (17th ed.) Citation

Nuuttila, Olli-Pekka, Heikki Kyröläinen, Veli-Pekka Kokkonen, and Arja Uusitalo. Morning Versus Nocturnal Heart Rate and Heart Rate Variability Responses to Intensified Training in Recreational Runners. SpringerOpen.

MLA (9th ed.) Citation

Nuuttila, Olli-Pekka, et al. Morning Versus Nocturnal Heart Rate and Heart Rate Variability Responses to Intensified Training in Recreational Runners. SpringerOpen.

Warning: These citations may not always be 100% accurate.