Voskuil, Caleb C.

Abstract Anderson, AlOK, Voskuil, CC, Byrd, MT, Garver, MJ, Rickard, AJ, Miller, WM, Bergstrom, HC, and Dinyer McNeely, TK. Affective and perceptual responses during an 8-week resistance training to failure intervention at low vs. high loads in untrained women. J Strength Cond Res 37(3): 546–554, 2023—This study examined the effects of resistance training (RT) to failure on the perceptual and affective responses, intent-to-continue RT to failure in a self-initiated session, and affect-intent relationship. Twenty-three untrained women (mean ± SD : age 21.2 ± 2.2 years; height 167 ± 5.7 cm; body mass, 62.3 ± 16.2 kg) completed an 8-week, full-body RT to failure intervention at a low (30% 1RM; n = 11) or high (80% 1RM; n = 12) load. The Borg’s rating of perceived exertion (RPE) scale was used to assess the acute (aRPE) and session (sRPE) RPE immediately after repetition failure and each training session, respectively. Immediately, 15-minute, and 60-minute postsession affective responses were assessed using the feeling scale (FS; −5 to +5), and intent to continue to RT was assessed on a scale of 0–100% intention. During week 4 (W4) and week 8 (W8), aRPE (W4: 18 ± 2, W8: 18 ± 2; p ≤ 0.032) and sRPE (W4: 17 ± 2, W8: 18 ± 1; p ≤ 0.018) were greater than that during week 1 (W1; aRPE: 17 ± 2; sRPE: 16 ± 2). The FS responses increased from immediately to 60-minute postsession during W4 ( p ≤ 0.019) and W8 ( p ≤ 0.049). The correlation between affect and intent-to-continue RT increased from W1 ( r = 0.416) to W8 ( r = 0.777). Regardless of load, untrained women reported similar perceptual, affective, and intention responses. These variables should be considered to improve RT program adoption and adherence in women.

Abstract Succi, PJ, Dinyer, TK, Byrd, MT, Voskuil, CC, and Bergstrom, HC. Application of V̇ o 2 to the critical power model to derive the critical V̇ o 2 . J Strength Cond Res 36(12): 3374–3380, 2022—The purposes of this study were to (a) determine whether the critical power (CP) model could be applied to V̇ o 2 to estimate the critical V̇ o 2 (CV̇ o 2 ) and (b) to compare the CV̇ o 2 with the V̇ o 2 at CP (V̇ o 2 CP), the ventilatory threshold (VT), respiratory compensation point (RCP), and the CV̇ o 2 without the V̇ o 2 slow component (CV̇ o 2 slow). Nine subjects performed a graded exercise test to exhaustion to determine V̇ o 2 peak, VT, and RCP. The subjects performed 4 randomized, constant power output work bouts to exhaustion. The time to exhaustion (T Lim ), the total work (W Lim ), and the total volume of oxygen consumed with (TV̇ o 2 ) and without the slow component (TV̇ o 2 slow) were recorded during each trial. The linear regressions of the TV̇ o 2 vs. T Lim , TV̇ o 2 slow vs. T Lim , and W Lim vs. T Lim relationship were performed to derive the CV̇ o 2 , CV̇ o 2 slow, and CP, respectively. A 1-way repeated-measures analysis of variance ( p ≤ 0.05) with follow-up Sidak-Bonferroni corrected pairwise comparisons indicated that CV̇ o 2 (42.49 ± 3.22 ml·kg −1 ·min −1 ) was greater than VT (30.80 ± 4.66 ml·kg −1 ·min −1 ; p < 0.001), RCP (36.74 ± 4.49 ml·kg −1 ·min −1 ; p = 0.001), V̇ o 2 CP (36.76 ± 4.31 ml·kg −1 ·min −1 ; p < 0.001), and CV̇ o 2 slow (38.26 ± 2.43 ml·kg −1 ·min −1 ; p < 0.001). However, CV̇ o 2 slow was not different than V̇ o 2 CP ( p = 0.140) or RCP ( p = 0.235). Thus, the CP model can be applied to V̇ o 2 to derive the CV̇ o 2 and theoretically is the highest metabolic steady state that can be maintained for an extended period without fatigue. Furthermore, the ability of the CV̇ o 2 to quantify the metabolic cost of exercise and the inefficiency associated with the V̇ o 2 slow component may provide a valuable tool for researchers and coaches to examine endurance exercise.