Abstract
Prupose: To investigate the effects of a 5-km high-intensity interval exercise (HIIE) on heart rate variability (HRV) and subsequent strength performance.Methods: Nine trained males performed a control session composed of a half-squat strength exercise (4 × 80% of one repetition maximum—1 RM) in isolation and 30-min, 1-, 4-, 8-, and 24-h after an HIIE (1-min at the velocity peak:1-min passive recovery). All experimental sessions were performed on different days. The maximum number of repetitions (MNR) and total weight lifted (TWL) during the strength exercise were registered in all conditions; in addition, prior to each session, HRV were assessed [beat-to-beat intervals (RR) and log-transformed of root means square of successive differences in the normal-to-normal intervals (lnRMSSD)].Results: Performance in the strength exercise dropped at 30-min (31%) and 1-h (19%) post-HIIE concomitantly with lower values of RR (781 ± 79 ms; 799 ± 134 ms, respectively) in the same recovery intervals compared to the control (1015 ± 197 ms). Inferential analysis did not detect any effect of condition on lnRMSSD, however, values were lower after 30-min (3.5 ± 0.4 ms) and 1-h (3.3 ± 0.5 ms) with moderate and large effect sizes (0.9 and 1.2, respectively) compared with the control condition (3.9 ± 0.4 ms).Conclusion: Both RR and lnRMSSD seem to be associated with deleterious effects on strength performance, although further studies should be conducted to clarify this association.
Highlights
Concurrent training is performed by athletes of many sports in order to acquire the adaptations promoted by both activities (Leveritt and Abernethy, 1999; Chamari and Padulo, 2015)
Heart Rate Variability and Strength Performance studies (Craig et al, 1991; Panissa et al, 2012; Inoue et al, 2015), which could contribute to the inhibition of long-term strength and hypertrophy gains (Sale et al, 1990; Craig et al, 1991)
The recovery interval has been postulated as an important variable to consider when prescribing aerobic and strength exercises on the same day since when these activities were separated by an adequate recovery interval (∼4–6-h) optimized long-term results were achieved (García-Pallarés et al, 2009; García-Pallarés and Izquierdo, 2011; Robineau et al, 2016)
Summary
Concurrent training (an association of aerobic and strength exercises) is performed by athletes of many sports in order to acquire the adaptations promoted by both activities (Leveritt and Abernethy, 1999; Chamari and Padulo, 2015). The recovery interval has been postulated as an important variable to consider when prescribing aerobic and strength exercises on the same day since when these activities were separated by an adequate recovery interval (∼4–6-h) optimized long-term results were achieved (García-Pallarés et al, 2009; García-Pallarés and Izquierdo, 2011; Robineau et al, 2016). Heart rate variability (HRV)—a noninvasive tool to assess the autonomic nervous activity through the heart rate (Pierpont et al, 2000; Padulo et al, 2013)—has been suggested as a simple device to monitor the fatigue and recovery status in several kinds of activities that require both high-intensity intermittent exercise (HIIE) and strength performances (Chen et al, 2011; Attene et al, 2014; Ibba et al, 2014; Nakamura et al, 2015; Saboul et al, 2015; Thorpe et al, 2015). As there are several factors which can affect HRV recovery, knowledge of the vagal reactivation time course for several kinds of activities and types of physical training may help coaches and physical trainers to prescribe exercises guided by individual responses (Buchheit, 2014)
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