Purpose: To determine if muscle activity is related to preferred stride frequency (PSF) during deep water running (DWR) and treadmill running on dry land (TMR). Methods: Subjects (n = 11; 26.2 ± 4.4 years) completed TMR and DWR at their mode-specific preferred stride frequency (PSFmode). They also ran at stride frequencies which were lower and higher than the PSFmode (i.e., PSFmode ± 5, 10, and 15 %). Muscle activity from the rectus femoris (RF), biceps femoris (BF), tibialis anterior (TA), and gastrocnemius (GL), SF, and rating of perceived exertion (RPE) were measured. Results: The PSFmode during DWR was significantly lower than that of TMR (i.e., 49.9 ± 11.0 versus 81.9 ± 4.8 strides/min, P < 0.0001). Additionally, muscle activity from the RF, TA, and GL during DWR was significantly lower than during TMR at respective PSFmode (~83.6 % decrease, P < 0.0001). However, RPE while running at the PSFmode during DWR and TMR was similar. During DWR, the RF, TA, and GL muscle activity was not different between PSFmode and any other SF conditions (P > 0.0005). During TMR, there was no significant difference in the RF and GL muscle activity between PSFmode and any other SF conditions during TMR (P > 0.0005). Conclusions: During DWR, subjects selected a lower PSF than during TMR even though RPE was the same. It was also determined that the relationship between muscle activity and changes in SF relative to the PSFmode was unique during DWR and TMR.
All Science Journal Classification (ASJC) codes
- Orthopedics and Sports Medicine
- Public Health, Environmental and Occupational Health
- Physiology (medical)